A new mandarin variety called ‘Tango’ is distinguished by production of fruit that combines mid to late season maturity, moderately large fruit size, very smooth rind texture with a deep orange color, and a rich, sweet flavor. It further distinguishes itself by being very low seeded and easy to peel.
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1. A new and distinct variety of mandarin hybrid tree having the characteristics essentially as described and illustrated herein.
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Latin name of the genus and species: The mandarin cultivar of this invention is botanically identified as Citrus reticulata.
Variety denomination: The variety denomination is ‘Tango’.
‘Tango’ is a mandarin selection developed at Riverside, Calif. from an irradiated bud of the diploid mandarin cultivar ‘W. Murcott’, a mid-late season maturing variety. The pedigree of ‘W. Murcott’ mandarin is unknown but is believed to be a seedling selection from a ‘Murcott’ Tangor tree produced in an open-pollinated field. The cultivar ‘W. Murcott’ from which ‘Tango’ was derived may be identical to a mandarin cultivar known as ‘Afourer’ and also as ‘Nadorcott’. The name ‘W. Murcott’ was assigned to a mandarin cultivar which was imported into the United States as buds in 1985 from Morocco. ‘Afourer’ and ‘Nadorcott’ are known to have originated in Morocco. ‘Nadorcott’ was patented in the United States in 1997 under U.S. Plant Pat. No. 10,480 (filed in January 1997).
‘Tango’ originated as a single plant and was asexually reproduced by grafting of budwood onto rootstocks. ‘Tango’ was selected and propagated as follows. Irradiation of budwood from registered “W. Murcott” trees in Lindcove, Calif. was accomplished in June, 1995 at Riverside using 50 Gray units of gamma irradiation from a Cobalt-60 irradiation source. Buds from this irradiation were propagated onto various rootstocks in the greenhouse at Riverside where they were grown to field-plantable-sized trees. These trees were planted in June 1996 at Riverside. Fruit production and evaluation began in 1998. One tree from this irradiated population (propagated on ‘C32’ citrange rootstock) distinguished itself from the others in having fruit that had very low seed counts with excellent fruit quality and normal fruit production characteristics in comparison to the original ‘W. Murcott’ cultivar. After two seasons of fruiting, this tree (now named ‘Tango’), was selected for further trials in 1999 and in January 2000 buds were taken and propagated onto ‘Carrizo’ and C35 citrange rootstock. Budwood was also sent in April 2000 for evaluation of disease status and elimination of viruses and other pathogens as needed.
Twenty trees were planted at Riverside in June 2001. Fruit production on these 20 trees commenced in 2003. In October 2001 two trees of ‘Tango’, which had been produced from budwood that had been tested and certified as tristeza-free, were sent to Lindcove, Calif. where they were planted in the citrus breeding block. Further propagations from the original selection tree in 2001 were made at Riverside and in June 2002 twenty trees were planted at Irvine, Calif., and 15 trees were planted at Santa Paula, Calif.
Fruit production of these propagated trees (at Lindcove, Irvine and Santa Paula) commenced in 2003 (a few trees at each site) and 2004 (all trees at all sites). In July 2002 budwood was taken from the Lindcove trees and topworked onto a navel orange/‘Carrizo’ citrange tree at Lindcove. In September 2002 eighteen trees, produced from budwood from trees at Lindocove were planted at Arvin, Calif. In August 2003 thirty-six additional trees were propagated at Lindcove from budwood taken from the Lindcove trees and in April 2004, twelve were planted in at Thermal, Calif., and in June 2004, twenty-four trees (twelve at each site) were planted at two sites, Lindcove and Woodlake, Calif. All trials were propagated on ‘Carrizo’ and ‘C35’ citrange rootstocks.
The present invention provides a novel mandarin variety having the characteristics described and illustrated herein. The variety, ‘Tango’, is a mandarin selection developed at the University of California Riverside from an irradiated bud of the diploid mandarin cultivar ‘W. Murcott’, a mid-late season maturing variety. ‘Tango’ combines mid to late season maturity, moderately large fruit size, very smooth rind texture with a deep orange color, and a rich, sweet flavor. It further distinguishes itself by being very low seeded (<1 seed/fruit) and very easy to peel.
Mid to late season maturing mandarin cultivars in production include ‘W. Murcott’ mandarin (the original cultivar from which ‘Tango’ was derived), ‘Murcott’ Tangor, ‘Fortune’ mandarin, ‘Ortanique’ mandarin, ‘Temple’ Tangor, late-maturing Clementina selections including ‘Hernandina’ and ‘Nour’, ‘Dancy’ mandarin and ‘Minneola’ tangelo. All of these cultivars will be seedy if grown in the presence of a pollenizer. Some, including the Clementina selections, ‘Fortune’, ‘Ortanique’, and ‘Page’ mandarins will have few seeds if no pollenizer is present. Recently released mid to late season cultivars that are very low-seeded include ‘Gold Nugget’ (unpatented), ‘TDE2’ mandarin hybrid (Shasta Gold®) having U.S. Plant Registration No. PP15,461, ‘TDE3’ mandarin hybrid (Tahoe Gold®) having U.S. Plant Registration No. PP15,703, and ‘TDE4’ mandarin hybrid (Yosemite Gold®), having U.S. Publication No. 2003/0237120. ‘Tango’ differs from these cultivars in having fruit with a smoother rind texture that are easier to peel. Trees of ‘Tango’ show less alternate bearing than these cultivars. Additional differences (summarized in Table 6) distinguish it from each of these cultivars.
Evaluation of ‘Tango’ began on the original tree at Riverside in 1998 and has continued annually until the present. Tree size, growth and fruit production characteristics and fruit quality characteristics have been compared in these evaluations to ‘W. Murcott’ mandarin from the same field block. Three and four-year-old ‘Tango’ trees in trials at Riverside, SCREC, Lindcove and Santa Paula, which were reproduced from the original ‘Tango’ selection as described above, have also been evaluated from one to two years of fruiting (see Tables 2, 4 and 5). The properties of ‘Tango’ were found to be true to type and transmissible by asexual reproduction in comparing these plantings with the original ‘Tango’ selection.
Tree size and growth characteristics of ‘Tango’ have been consistent with ‘W. Murcott’ throughout the evaluation. Growth of both the ‘W. Murcott’ and the ‘Tango’ selection has been generally upright in the first four years followed by a tendency to grow into a more spherical shape in ensuing years. The nine-year-old ‘Tango’ tree at Riverside is 3.7 m high and 3.8 m wide with a normal upright growth habit yielding a canopy volume of 29.0 m3. In comparison nine-year-old ‘W. Murcott’ control trees have averaged 3.8 m tall and 3.8 m wide yielding a canopy volume of 29.8 m3 while sixteen-year-old ‘W. Murcott’ trees have averaged 4.2 m tall and 4.7 m wide on ‘Carrizo’ citrange rootstock (canopy volume=50.4 m3) and 3.9 m high and 4.4 m wide on ‘C35’ citrange rootstock (canopy volume=41.0 m3). Scion circumference for ‘Tango’ on C32 rootstock was 55.5 cm with the rootstock circumference 60.8 cm. Scion circumference for the nine-year old ‘W. Murcott’ trees averaged 56.9 cm on ‘Carrizo’ rootstock while sixteen-year-old ‘W. Murcott’ trees averaged 59.7 cm on ‘Carrizo’ rootstock and 55.2 cm on ‘C35’ rootstock. In the younger multi-location trials three-year-old ‘Tango’ trees on ‘Carrizo’ rootstock have averaged 1.9 m in height and 1.3 m in diameter with canopy volumes of 1.75 m3 and trees on ‘C35’ rootstock averaged 2.0 m in height and 1.4 m in diameter with canopy volumes of 2.05 m3.
‘Tango’ distinguishes itself by being very low seeded (<1 seed/fruit) in all situations of cross-pollination, differing from ‘W. Murcott’ which will set up to 10-20 seeds/fruit in cross-pollinated situations. In Riverside, Calif., ‘Tango’ fruit matures in winter (late January). ‘Tango’ holds its fruit quality characteristics through April. Fruit size is moderately large (59 mm) averaging 90 grams per fruit. Fruit are deeply oblate in shape with a deep orange rind color and a very smooth rind texture. Flesh color is deep orange and finely textured, fruit are juicy, with a rich, sweet flavor when mature, and are easy to peel. Tree growth habit is upright with excellent production commencing in the second year after planting. Alternate bearing does not appear to be a significant problem. ‘Tango’ was known throughout experimental evaluation as ‘W. Murcott’ IR1 (for ‘W. Murcott’ IRradiated selection #1). The Royal Horticultural Society (R.H.S) color numbering system is used herein for the color description of the rind, seed, bark, leaf, flower, flesh color and other interest of the ‘Tango’ mandarin hybrid tree.
Leaves of ‘Tango’ are ovate in shape and concave in cross section, with an acute apex with weak emargination and a convex base and are dark-green in color. Petioles are short and normal lacking wings. The selection lacks thorns. Flowers of ‘Tango’ are hermaphroditic with greenish-white petals and orangish-yellow anthers and are borne in clusters. In Riverside, Calif. buds form in late-February. Flowering occurs in late-March and continues through April. The flowers have a medium fragrance. Pollen viability for ‘Tango’ is very low (<5% germination), pollen grains are smaller (18-20 microns) and pollen production is sparse (10-15%) in comparisons to ‘W. Murcott’ (78% pollen germination, pollen grains 32-34 microns in diameter).
Fruit of ‘Tango’ are deeply oblate in shape with no neck. The fruit has a slightly concave basal end (moderately depressed) with a truncate (slightly depressed) distal end and a non-persistent style. The fruit is medium sized for a mandarin (classed as Large by State of California standards) averaging 59 mm in diameter and 48 mm in height with a very smooth, deep orange rind color (RHS Orange N25A) and relatively inconspicuous, slightly depressed oil glands. The rind is slightly adherent at maturity (easy to peel) and relatively thin averaging 3.0 mm in thickness. The fruit interior has a fine flesh texture with 9-10 segments and a semi-hollow axis of medium size at maturity. The fruit are juicy averaging slightly over 50% juice and average 90.6 g in weight. Fruit from trees on ‘Carrizo’ and ‘C35’ citrange rootstocks average 11.1-13.1% soluble solids and 0.97-1.19% acid in January at four trial locations in California increasing to 13.5-14.4% soluble solids and 0.54-0.82% acid in April. The fruit average less than 0.5 seeds per fruit in the presence of cross-pollination at all locations. Seeds, when present, are polyembryonic, slightly greyed-yellow in color (RHS 162D) with greyed-yellow (RHS 163D) colyledons and a greyed-orange (RHS 164B) inner seed coat. When present, the seeds are 9 mm long and 5 mm wide and are oval with a slightly pointed, flattened seed coat on the radical end of the seed.
TABLE 1
Tree, leaf, flower and seed characteristics (for nine-year-old tree)
of ‘Tango’ mandarin. Data from Riverside, Calif.
Tree height
3.7 m
Crown diameter
3.8 m
Crown shape
Upright when young changing to
spherical as tree matures
Trunk circumference (for scion)
55.5 cm measured 25 cm above
(on C32 rootstock)
the soil line, 8 cm above the bud
union
Trunk circumference (for rootstock)
66.0 cm measured 10 cm above
(on C32 rootstock)
the soil line, 7 cm below the bud
union
Trunk surface texture
smooth
Bud-union characteristics
Slightly benched
(citranges)
Trunk surface texture
smooth
Bud-union characteristics
Slightly benched
(citranges)
Rootstock-scion compatibility
Excellent (with citranges)
Tree vigor
Vigorous
Bark color
RHS Grey-Brown N199A
Leaf shape
Ovate
Leaf cross-section
Concave
Leaf blade length
63.9 mm
Leaf blade width
28.9 mm
Leaf apex
Acute with weak emargination
Leaf Base
Convex
Leaf abaxial color
RHS Yellow-Green 146B
Leaf adaxial color
RHS Green 137A
Petiole length
5.9 mm
Petiole width
1.5 mm
Petiole color
RHS Green 137A
Thorniness
Not present
Inflorescence type
Clustered
Flowering habit
Flowers once per year
Flower size
11.0 mm (medium)
Flower structure
Complete
Petal color
RHS Green-White 157C
Anther color
RHS Yellow-Orange 15C
Pollen size
18-20 microns
Pollen viability
Very low (<5%)
TABLE 2
Fruit characteristics of ‘Tango’ mandarins from four
trial sites (Riverside, SCREC, Lindcove and Santa Paula)
Fruit shape
Deeply oblate
Fruit diameter
59.0 mm ± 7.5
Fruit height
48 mm ± 3.2
Fruit: shape of basal end
Slightly concave
(moderately depressed)
Fruit: shape of distal end
Truncate
(slightly depressed)
Fruit neck
Not present
Style
Not persistent
Rind texture
Smooth
Oil glands
Conspicuous, slightly
depressed
Rind Color
RHS Orange N25A
Rind thickness
3.0 mm
Albedo thickness
1.5 mm
Albedo color
RHS Orange 24D
Rind adherence
Moderately weak
Rind separation
Slight
Flesh (pulp) color
RHS Orange-Red N30D
Flesh (pulp) texture
Fine
Number of segments
9-10
Axis: structure
Semi-hollow
Axis: size
Medium
Navel presence
Not present
# Seeds/fruit
0.22 (cross pollinated
conditions)
Seed embryony
Polyembryonic
Seed coat color
Greyed-Yellow 162D
Seed cotyledon color
Greyed-Yellow 163D
Seed inner coat color
Greyed-Orange 164B
Fruit weight
90.4 g
% Juice
50.2%
% Soluble solids (at maturity)
12.5%
% Acid (at maturity)
0.98%
Season of maturity
Mid-late (late January-
February)
Fruit holding ability
2-3 months
on tree past maturity
Fruit quality after storage
Excellent
(5.6° C., 31 days)
‘Tango’ is a mid to late season maturing diploid mandarin that combines medium large sized fruit of excellent quality and production with very low seed content even in mixed plantings. It would likely be successful in the mid- to late-season marketing window that currently has very few low seeded cultivars.
‘Tango’ mandarin can be grown according to accepted cultural practices for most mandarin varieties including planting densities of 150-250 trees per acre, normal fertilization and pest control practices, and the use of standard rootstocks for mandarins. Pruning may enhance production and health of the tree if applied after the second year of full fruit production. Other rootstocks adapted to more marginal growing conditions of salinity, high pH or very heavy soils may be useful in those conditions.
Fruit production of ‘Tango’ begins in the second year after planting similar to ‘W. Murcott’. This is one year ahead of most mandarin cultivars which begin fruiting in the third year after planting. Fruit production on two-year-old trees averaged 10-26 kg, and in three-year-old trees averaged 33-58 kg at the three fruiting trial sites. The original tree at Riverside was similar in fruit production in the second and third years and in years 5, 6 and 7 yielded 98, 90 and 101 kg of fruit respectively indicating that in the earlier years of production the variety does not alternate bear, similar to ‘W. Murcott’.
TABLE 3
Crop yields for ‘Tango’ and ‘W. Murcott’ (control trees) at
three trial sites over two years, 2003/2004 and 2004/2005.
Tree
#
Age
Site
Selection
Trees
(yrs)
Rootstock
Riverside
‘Tango’
12
3.5
Carrizo
Riverside
‘Tango’
8
3.5
C35
Riverside
‘Tango’
1
9
C32
(mother)
Riverside
‘W. Murcott’
2
9
Carrizo
control
Santa
‘Tango’
10
2.5
Carrizo
Paula
Santa
‘Tango’
5
2.5
C35
Paula
Santa
‘W. Murcott’
3
2.5
Carrizo
Paula
control
Irvine
‘Tango’
9
2.5
Carrizo
Irvine
‘Tango’
10
2.5
C35
2003/4
2003/4
2004/5
2004/5
Mean
Yield
Mean
Yield
Site
Yield (kg)
Range (kg)
Yield (kg)
Range (kg)
Riverside
12.8
9.3-17.9
49.8
35.1-58.3
Riverside
12.0
7.8-14.9
46.9
31.4-55.2
Riverside
101.3
101.3
42.3
42.3
Riverside
88.5
82.4-96.6
93.7
88.1-99.3
Santa
*
*
22.2
14.3-25.7
Paula
Santa
*
*
22.7
15.1-26.4
Paula
Santa
*
*
16.9
14.1-18.7
Paula
Irvine
*
*
5.9
1.4-18.6
Irvine
*
*
10.7
2.3-17.3
*-not fruiting
TABLE 4
Seed counts (average number of seeds per fruit) for ‘Tango’ and
‘W. Murcott’ (control trees) at three trial sites over two years,
2003/2004 and 2004/2005.
2004/5
2004/5
Tree
Mean
Seed
Selec-
Age
Seeds/
Count
Site
tion
(yrs)
Rootstock
Fruit
Range
Riverside
‘Tango’
3.5
‘Carrizo’
0.21
0.0-0.80
Riverside
‘Tango’
3.5
‘C35’
0.09
0.0-0.28
Riverside
‘Tango’
9
‘C32’
0.22
NA
(mother)
Riverside
‘W. Murcott’
9
‘Carrizo’
12.3
10.1-14.4
control
Santa
‘Tango’
2.5
‘Carrizo’
0.04
0.0-0.16
Paula
Santa
‘Tango’
2.5
‘C35’
0.06
0.0-0.20
Paula
Santa
‘W. Murcott’
2.5
‘Carrizo’
6.8
6.2-7.4
Paula
control
Irvine
‘Tango’
2.5
‘Carrizo’
0.04
0.0-0.07
Irvine
‘Tango’
2.5
‘C35’
0.07
0.0-0.13
Lindcove
‘Tango’
2.5
‘Carrizo’
0.12
0.10-0.15
Lindcove
‘W. Murcott’
15
‘Carrizo’
9.1
6.8-13.0
control
TABLE 5
Mean and standard deviation (S.D.) of soluble solids, acid and solids/acid
ratio for ‘Tango’ and ‘W. Murcott’ (control trees) at three trial sites,
2004/2005 crop year.
Soluble
Soluble
Solids
Solids
%
%
%
Acid
Site
Date
Carrizo
S.D.
C35
S.D.
Carrizo
Riverside
Jan. 6, 2005
12.8
0.31
12.6
0.50
1.39
Riverside
Feb. 10, 2005
13.2
0.44
13.0
0.26
1.06
Riverside
Mar. 9, 2005
13.7
0.13
13.8
0.33
0.89
Riverside
Apr. 18, 2005
14.4
0.50
14.1
0.37
0.78
Santa Paula
Jan. 24, 2005
13.1
0.29
13.3
0.36
0.97
Santa Paula
Feb. 15, 2005
13.3
0.19
13.7
0.39
0.90
Santa Paula
Mar. 15, 2005
13.8
0.33
14.2
0.44
0.80
Santa Paula
Apr. 20, 2005
14.1
0.36
14.7
0.45
0.76
Irvine
Jan. 20, 2005
12.1
0.66
11.9
0.49
1.03
Irvine
Feb. 11, 2005
12.9
0.38
12.8
0.55
0.89
Irvine
Mar. 14, 2005
13.9
0.44
13.5
0.26
0.78
Irvine
Apr. 13, 2005
13.8
0.48
13.5
0.41
0.67
Lindcove
Jan. 18, 2005
11.1
0.26
NA
NA
1.19
Lindcove
Feb. 16, 2005
12.3
0.16
NA
NA
1.00
Lindcove
Mar. 17, 2005
13.0
0.20
NA
NA
0.88
%
S/A
S/A
Acid
Ratio
Ratio
Site
S.D.
C35
S.D.
Carrizo
C35
Riverside
0.16
1.22
0.08
9.2
10.3
Riverside
0.08
1.09
0.06
12.5
11.9
Riverside
0.09
0.93
0.03
15.4
14.78
Riverside
0.13
0.82
0.06
18.5
17.2
Santa Paula
0.19
0.89
0.07
13.5
14.9
Santa Paula
0.09
0.84
0.07
14.7
16.3
Santa Paula
0.16
0.81
0.06
17.3
17.5
Santa Paula
0.10
0.73
0.10
18.6
20.1
Irvine
0.14
1.10
0.12
11.7
10.8
Irvine
0.13
0.90
0.14
14.5
14.2
Irvine
0.08
0.77
0.11
17.8
17.5
Irvine
0.08
0.54
0.11
20.6
25.0
Lindcove
0.15
NA
NA
9.3
NA
Lindcove
0.11
NA
NA
12.3
NA
Lindcove
0.06
NA
NA
14.8
NA
NA - not applicable (no trees of this type in trial)
‘Tango’ mandarin exhibits very low seed numbers (<1 seed per fruit) in all fruit under all conditions of cross-pollination. Additionally, preliminary evaluations indicate that pollen from ‘Tango’ has very low germination rates in culture (<5%) and does not appear to cause seeds in other mandarins, causing no seed in selected Clementine mandarin cultivars when hand pollinated onto those selections. A comparison of ‘Tango’ with other low-seeded late-season mandarins is provided in Table 6. ‘Tango’ is distinctive and superior in having a smoother rind, less alternative bearing, and smaller fruit size that may be preferred in some markets.
TABLE 6
Comparison of ‘Tango’ with other late season,
low-seeded mandarins. Data for Riverside, Calif.
‘Gold
Trait
‘Tango’
‘TDE2’
‘TDE3’
‘TDE4’
Nugget’
Maturity
late
mid
January-
February
late
January-
February
February
January-
February
February
Seeds per
0.22
0.02
0.29
0.32
<0.1
fruit
RHS rind
orange
orange-red
orange-red
orange-red
orange
color
N25A
N30D
N30C
N30C
25A
Rind texture
very
slightly
papillate
Smooth
bumpy
smooth
pitted
Fruit
90
185
134
175
108
weight (g)
Fruit
0.81
0.78
0.85
0.78
0.88
height/width
Alternate
Low
medium
medium-
medium-
high
bearing
high
high
Fruit storage trials included storage of washed but not waxed fruit at 5.6° C. for up to 60 days with fruit samples taken every 14 days for analysis. Data indicate that the storage characteristics of ‘Tango’ is excellent with no noticeable loss of rind quality or color, no significant indication of fungal disease problems and no significant loss of size or deterioration in juice quality or taste over the 60 day storage period.
No susceptibilities to plant or fruit diseases or to pests beyond those normally associated with citrus species have been observed.
Roose, Mikeal L., Williams, Timothy E.
| Patent | Priority | Assignee | Title |
| PP24947, | Mar 05 2012 | Royal Honey Pty Ltd ATF Royal Honey IP Trust | Tangor tree named ‘RHM’ |
| Patent | Priority | Assignee | Title |
| PP10480, | Jan 28 1997 | NADOR COTT PROTECTION SARL; NADOR COTT PROTECTION SARL CAPITAL E 17,320 | Mandarin tangerine called Nadorcott |
| PP13460, | Nov 20 2000 | State of Israel - Ministry of Agriculture and Rural Development | Citrus tree named `Moria` |
| PP8378, | Sep 20 1991 | State of Israel-Ministry of Agriculture | Mandarin tree names Mor |
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| Aug 31 2005 | ROOSE, MIKEAL L | Regents of the University of California | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 016977 | /0467 | |
| Aug 31 2005 | WILLIAMS, TIMOTHY E | Regents of the University of California | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 016977 | /0467 | |
| Sep 06 2005 | The Regents of the University of California | (assignment on the face of the patent) | / |
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