Triploid in Poaceae: Formation, Detection, and Utilization

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  • 1Sericulture Research Institute/Animal Husbandry Research Center, Sichuan Academy of Agricultural Sciences, Nanchong 637000, China
    2Maize Research Institute, Sichuan Agricultural University, Wenjiang 611130, China
    3School of Urban and Rural Planning and Construction, Mianyang Teachers’ College, Mianyang 621000, China

Received date: 2020-10-09

  Accepted date: 2021-01-21

  Online published: 2021-01-22

Abstract

The formation pathway of triploid in Poaceae includes 2n gamete fusion, interploidy cross, polyspermy, and endosperm culture. The fusion of reduced male (n) and unreduced female gamete (2n) is the main method for forming natural triploids. Interploidy cross is the main method for synthesizing artificial triploids. The application of ploidy identification methods such as morphological observation, chromosome analysis, flow cytometry and molecular markers in gramineous triploids is introduced, and the advantages and disadvantages of different methods are also discussed. At present, triploid has no direct application value in cereal crops, but it can be used as a genetic bridge to synthetize polyploid and aneuploid, as well as to transfer alien genes from wild species to cultivated species. Gramineous triploids (especially allotriploid) are widely cultivated for forage or biofuel production, suggesting that triploidy breeding may be directly performed in this type of grasses. We discuss the future prospect of research on gramineous triploid, e.g., polyploid- and apomixis-triploid breeding. Particularly, endosperm culture can synthesize triploids in one step, and polyspermy can achieve one-step fusion of three genetically different plant genomes, which should be paid attention to in the triploidy research. Due to rare occurrence of 2n gamete fusion and polyspermy, and frequent chromosomal variation in ploidy hybridization and endosperm culture, the development of high-throughput triploid identification technology will become the key for breakthrough in triploidy generation/breeding.

Cite this article

Xu Yan, Yanchun Zuo, Honglin Wang, Yang Li, Yingzheng Li, Jing Kou, Qilin Tang, Xiaokang Zhou, Zhouhe Du . Triploid in Poaceae: Formation, Detection, and Utilization[J]. Chinese Bulletin of Botany, 2021 , 56(3) : 372 -387 . DOI: 10.11983/CBB20166

References

1 陈平, 吴秀峰, 席嘉宾, 梁红 (2004). 华南1号杂交狼尾草选育初报. 仲恺农业技术学院学报 17, 56-59.
2 陈钟佃, 黄勤楼, 黄秀声, 冯德庆, 钟珍梅 (2012). “闽牧6号”狼尾草的选育及田间种植技术. 家畜生态学报 33, 53-55.
3 程祝宽, 李欣, 于恒秀, 顾铭洪 (1996). 一套新的籼稻初级三体的选育和细胞学鉴定. 遗传学报 23, 363-371.
4 党江波, 宋琴, 李彩, 郭启高, 梁国鲁 (2018). 园艺植物中三倍体的应用现状及育种前景分析. 园艺学报 45, 1813-1830.
5 顾洪如, 杨运生, 白淑娟, 陈礼伟 (1992). 牧草新品种“宁牧26-2”狼尾草. 江苏农业科学 ( 4), 61-63.
6 黄群策, 孙敬三 (1999). 通过异倍性水稻间杂交获得同源三倍体植株. 植物学报 41, 741-746.
7 刘国道, 白昌军, 王东劲, 易克贤, 韦家少, 何华玄, 周家锁 (2002). 热研4号王草选育. 草地学报 10, 92-96.
8 刘秀明, 崔腾腾, 葛春霞, 陈翠霞 (2014). 我国野生芒资源的细胞学研究. 草业科学 31, 627-631.
9 罗宗志, 林洁荣, 罗虹建, 林志魁, 陈碧成 (2016). 杂交狼尾草和桂牧1号杂交象草的核型分析. 贵州农业科学 44, 8-12.
10 吕桂华, 唐祈林, 郭国锦, 陈坚剑, 荣廷昭 (2015). 玉米(Zea mays)×四倍体多年生玉米(Zea perennis)可育三倍体形态学和细胞遗传学研究. 植物遗传资源学报 16, 1152-1156.
11 潘志军, 易自力, 杨塞, 肖亮 (2017). 三倍体芒草自然杂交后代数量性状遗传多样性研究. 植物遗传资源学报 18, 984-990.
12 任勇, 陈柔屹, 唐祈林, 荣廷昭 (2007). 新型饲草玉米生长动态及收割期的研究. 作物学报 33, 1360-1365.
13 孙福艾 (2017). 一份薏苡多倍体材料的创制、鉴定及饲用价值初步评价. 硕士论文. 雅安: 四川农业大学. pp. 1-54.
14 孙敬三, 朱至清 (1981). 大麦胚乳植株的诱导及其倍性. 植物学报 23, 262-265.
15 田立忠, 徐爱菊 (2000). 高粱(Sorghum bicolor (L.) Moench)未成熟胚乳培养的研究. 辽宁师范大学学报(自然科学版) 23, 395-402.
16 王敬驹, 陆文梁, 匡柏健 (1982). 小黑麦杂种胚乳的离体培养研究. 植物学报 24, 420-425.
17 王润奇, 高俊华, 王志兴, 王志民 (1994). 谷子三体系列的建立. 植物学报 36, 690-695.
18 汪艳, 肖媛, 刘伟, 李婷婷, 胡锐, 乔志仙 (2015). 流式细胞仪检测高等植物细胞核DNA含量的方法. 植物科学学报 33, 126-131.
19 许蕾, 陈佩琳, 冯光燕, 钟旻依, 景婷婷, 黄琳凯, 张新全 (2019). 利用流式细胞仪鉴定鸭茅倍性. 草业学报 28, 74-84.
20 于卓, 云锦凤, 马有志, 辛志勇 (2004). 加拿大披碱草×野大麦三倍体杂种染色体的分子原位杂交鉴定. 遗传学报 31, 735-739.
21 袁金玲, 顾小平, 岳晋军, 吴晓丽 (2015). 一种毛竹胚乳培养的方法. 中国专利, ZL 201510566151.8. 2015-09-08.
22 张静, 吴先军, 汪旭东, 周开达, 彭海 (2002). 特异同源三倍体水稻材料SAR-3细胞学研究. 作物学报 28, 704-708.
23 张茜, 裘天航, 王安安, 周华健, 袁敏, 李利, 白素兰, 崔素霞 (2020). 北京地区芦苇资源状态及其多样性. 植物学报 55, 693-704.
24 张智奇, 钟维瑾, 唐克轩, 周音, 祝明福 (1994). 异源三倍体水稻原生质体培养及植株再生. 作物学报 20, 578-581.
25 赵世绪, 刘瑞凝, 敖光明, 陈一心 (1984). 小麦、黑麦未成熟胚乳植株的诱导. 北京农业大学学报 10, 129-132.
26 钟声 (2006). 鸭茅不同倍性杂交及后代发育特性的初步研究. 西南农业学报 19, 1034-1038.
27 钟小仙, 刘智微, 刘伟国, 崔莉莉, 吴娟子, 张建丽 (2014). 六倍体杂交狼尾草体细胞突变体特异性分析. 草业学报 23, 107-113.
28 祝剑峰, 刘幼琪, 王爱云, 宋兆建, 陈冬玲, 蔡得田 (2008). 异源六倍体水稻AACCDD和三倍体水稻ACD生殖特性的细胞胚胎学研究. 植物遗传资源学报 9, 350-357.
29 Bajaj YPS, Saini SS, Bidani M (1980). Production of triploid plants from the immature and mature endosperm cultures of rice. Theor Appl Genet 58, 17-18.
30 Bastiaanssen HJM, Van Den Berg PMMM, Lindhout P, Jacobsen E, Ramanna MS (1998). Postmeiotic restitution in 2 n-egg formation of diploid potato. Heredity 81, 20-27.
31 Beale KM, Leydon AR, Johnson MA (2012). Gamete fusion is required to block multiple pollen tubes from entering an Arabidopsis ovule. Curr Biol 22, 1090-1094.
32 Boller B, Kopeck D (2020). Triploid forage grass hybrids Festuca apennina × F. pratensis display extraordinary heterosis for yield characteristics. Euphytica 216, 143.
33 Bretagnolle FO (2001). Pollen production and spontaneous polyploidization in diploid populations of Anthoxanthum alpinum. Biol J Linn Soc 72, 241-247.
34 Brownfield L, K?hler C (2011). Unreduced gamete formation in plants: mechanisms and prospects. J Exp Bot 62, 1659-1668.
35 Campos JMS, Davide LC, Salgado CC, Santos FC, Costa PN, Silva PS, Alves CCS, Viccini LF, Pereira AV (2009). In vitro induction of hexaploid plants from triploid hybrids of Pennisetum purpureum and Pennisetum glaucum. Plant Breed 128, 101-104.
36 Chandra A, Genovesi AD, Wherley BG, Metz SP, Reinert JA, Wu YZ, Skulkaew P, Engelke MC, Hargey D, Nelson LR, Schwartz BM, Raymer PL, Wu YQ, Martin DL, Milla-Lewis SR, Miller G, Kenworthy KE, Munoz P (2015). Registration of ‘DALSA 0605’ St. Augustinegrass. J Plant Regist 9, 27-34.
37 Chen C, Sleper DA, Chao S, Johal GS, West CP (1997). RFLP detection of 2 n pollen formation by first and second division restitution in perennial ryegrass. Crop Sci 37, 76-80.
38 Costich DE, Friebe B, Sheehan MJ, Casler MD, Buckler ES (2010). Genome-size variation in switchgrass ( Panicum virgatum): flow cytometry and cytology reveal rampant aneuploidy. Plant Genome 3, 130-141.
39 De Storme N, Zamariola L, Mau M, Sharbel TF, Geelen D (2013). Volume-based pollen size analysis: an advanced method to assess somatic and gametophytic ploidy in flowering plants. Plant Reprod 26, 65-81.
40 Delomas TA (2019). Differentiating diploid and triploid individuals using single nucleotide polymorphisms genotyped by amplicon sequencing. Mol Ecol Resour 19, 1545-1551.
41 Dewald CL, Taliaferro CM, Dunfield PC (1992). Registration of four fertile triploid germplasm lines of eastern gamagrass. Crop Sci 32, 504.
42 Duan QH, Liu MCJ, Kita D, Jordan SS, Yeh FLJ, Yvon R, Carpenter H, Federico AN, Garcia-Valencia LE, Eyles SJ, Wang CS, Wu HM, Cheung AY (2020). FERONIA controls pectin- and nitric oxide-mediated male-female interaction. Nature 579, 561-566.
43 Dvorak J, Harvey BL, Coulman BE (1973). The use of nitrous oxide for producing eupolyploids and aneuploids in wheat and barley. Can J Genet Cytol 15, 205-214.
44 Erichsen AW, Ross JG (1963). A triploid derived from a selfed haploid Sorghum plant. Crop Sci 3, 99-100.
45 Falistocco E, Tosti N, Falcinelli M (1995). Cytomixis in pollen mother cells of diploid Dactylis, one of the origins of 2n gametes. J Hered 86, 448-453.
46 Filho RAB, Santos ACC, Souza FHD, Valls JFM, Pagliarini MS (2014). Complete asynapsis resulting in 2n pollen formation in Paspalum jesuiticum Parodi (Poaceae). Genet Mol Res 13, 255-261.
47 Gao LH, Diarso M, Zhang A, Zhang HK, Dong YZ, Liu LX, Lv ZL, Liu B (2016). Heritable alteration of DNA methylation induced by whole-chromosome aneuploidy in wheat. New Phytol 209, 364-375.
48 Ghimire BK, Seong ES, Nguyen TX, Yoo JH, Yu CY, Kim SH, Chung I (2016). Assessment of morphological and phytochemical attributes in triploid and hexaploid plants of the bioenergy crop Miscanthus × giganteus. Ind Crop Prod 89, 231-243.
49 Hagerup O (1947). The spontaneous formation of haploid, polyploid, and aneuploid embryos in some orchids. Biol Meddel Kongol Danske Vidensk Selsk 20, 1-22.
50 Hanna WW, Schertz KF (1971). Trisome identification in Sorghum bicolor( L.) Moench by observing progeny of triploid × translocation stocks. Can J Genet Cytol 13, 105-109.
51 Harlan JR, DeWet JMJ (1975). On ?. Winge and a prayer: the origins of polyploidy. Bot Rev 41, 361-390.
52 Henry IM, Dilkes BP, Miller ES, Burkart-Waco D, Comai L (2010). Phenotypic consequences of aneuploidy in Arabidopsis thaliana. Genetics 186, 1231-1245.
53 Hoshino Y, Miyashita T, Thomas TD (2011). In vitro culture of endosperm and its application in plant breeding: approaches to polyploidy breeding. Sci Hortic 130, 1-8.
54 Hu FR, Zhang L, Wang XY, Ding J, Wu DX (2005). Agrobacterium-mediated transformed transgenic triploid bermudagrass ( Cynodon dactylon × C. transvaalensis) plants are highly resistant to the glufosinate herbicide liberty. Plant Cell Tissue Organ Cult 83, 13-19.
55 Iqbal MZ, Cheng MJ, Zhao YL, Wen XD, Zhang P, Zhang L, Ali A, Rong TZ, Tang QL (2018). Mysterious meiotic behavior of autopolyploid and allopolyploid maize. Comp Cytogenet 12, 247-265.
56 Iwata N, Omura T (1975). Studies on the trisomics in rice plants (Oryza sativa L.): III. Relation between trisomics and genetic linkage groups. Jpn J Breed 25, 363-368.
57 Jansen RC, Den Nijs APM (1993). A statistical mixture model for estimating the proportion of unreduced pollen grains in perennial ryegrass (Lolium perenne L.) via the size of pollen grains. Euphytica 70, 205-215.
58 Johansen B, Von Bothmer R (1994). Pollen size in Hordeum L.: correlation between size, ploidy level, and breeding system. Sex Plant Reprod 7, 259-263.
59 Johri BM, Bhojwani SS (1965). Growth responses of mature endosperm in cultures. Nature 208, 1345-1347.
60 Kamps TL, Williams NR, Ortega VM, Chamusco KC, Harris-Shultz K, Scully BT, Chase CD (2011). DNA polymorphisms at bermudagrass microsatellite loci and their use in genotype fingerprinting. Crop Sci 51, 1122-1131.
61 Kapadia ZJ, Gould FW (1964). Biosystematic studies in the Bouteloua curtipendula complex. III. Pollen size as related to chromosome numbers. Am J Bot 51, 166-172.
62 Kato A (1999). Induction of bicellular pollen by trifluralin treatment and occurrence of triploids and aneuploids after fertilization in maize. Genome 42, 154-157.
63 Kato A, Birchler JA (2006). Induction of tetraploid derivatives of maize inbred lines by nitrous oxide gas treatment. J Hered 97, 39-44.
64 Katsiotis A, Forsberg RA (1995). Pollen grain size in four ploidy levels of genus Avena. Euphytica 83, 103-108.
65 Keller B, Feuillet C (2000). Colinearity and gene density in grass genomes. Trends Plant Sci 5, 246-251.
66 Kindiger B, Dewald C (1994). Genome accumulation in eastern gamagrass, Tripsacum dactyloides(L.) L. 92, 197-201.
67 King IP, Morgan WG, Harper JA, Thomas HM (1999). Introgression mapping in the grasses. II. Meiotic analysis of the Lolium perenne/Festuca pratensis triploid hybrid. Heredity 82, 107-112.
68 Kirov I, Divashuk M, Van Laere K, Soloviev A, Khrustaleva L (2014). An easy "SteamDrop" method for high quality plant chromosome preparation. Mol Cytogenet 7, 21.
69 Krans JV, Philley HW, Goatley JM Jr, Maddox VL (1999). Registration of ‘MS-Supreme’ bermudagrass. Crop Sci 39, 287.
70 Kreiner JM, Kron P, Husband BC (2017). Frequency and maintenance of unreduced gametes in natural plant populations: associations with reproductive mode, life history and genome size. New Phytol 214, 879-889.
71 Kron P, Husband BC (2015). Distinguishing 2N gamete nuclei from doublets in pollen using flow cytometry and pulse analysis. Cytometry Part A 87, 943-957.
72 La Rue CD (1949). Cultures of the endosperm of maize. Am J Bot 36, 798.
73 Lamote V, Baert J, Roldán-Ruiz I, De Loose M, Van Bockstaele E (2002). Tracing of 2n egg occurrence in perennial ryegrass (Lolium perenne L.) using interploidy crosses. Euphytica 123, 159-164.
74 Lim KB, Ramanna MS, De Jong JH, Jacobsen E, Van Tuyl JM (2001). Indeterminate meiotic restitution (IMR): a novel type of meiotic nuclear restitution mechanism detected in interspecific lily hybrids by GISH. Theor Appl Genet 103, 219-230.
75 Loginova DB, Silkova OG (2017). Mechanisms of unreduced gamete formation in flowering plants. Russ J Genet 53, 741-756.
76 Lu SY, Peng XX, Guo ZF, Zhang GY, Wang ZC, Wang CY, Pang CS, Fan Z, Wang JH (2007). In vitro selection of salinity tolerant variants from triploid bermudagrass ( Cynodon transvaalensis × C. dactylon) and their physiological responses to salt and drought stress. Plant Cell Rep 26, 1413-1420.
77 Maceira NO, De Haan AA, Lumaret R, Billon M, Delay J (1992). Production of 2 n gametes in diploid subspecies of Dactylis glomerata L. 1. Occurrence and frequency of 2n pollen. Ann Bot 69, 335-343.
78 Mason AS, Nelson MN, Yan GJ, Cowling WA (2011). Production of viable male unreduced gametes in Brassica interspecific hybrids is genotype specific and stimulated by cold temperatures. BMC Plant Biol 11, 103.
79 Multani DS, Jena KK, Brar DS, De Los Reyes BG, Angeles ER, Khush GS (1994). Development of monosomic alien addition lines and introgression of genes from Oryza australiensis Domin. to cultivated rice O. sativa L. Theor Appl Genet 88, 102-109.
80 Mutlu SS, Mutlu N, Tokg?z S, ?ak?r M, Selim C (2020). Development of vegetative triploid turf-type bermudagrass [ Cynodon dactylon × C. transvaalensis (C. × mangennisii Hurcombe)]. Genet Resour Crop Evol 67, 177-189.
81 Naganowska B, Zwierzykowski Z, Zwierzykowska E (2001). Meiosis and fertility of reciprocal triploid hybrids of Lolium multiflorum with Festuca pratensis. J Appl Genet 42, 247-255.
82 Nakano H, Tashiro T, Maeda E (1975). Plant differentiation in callus tissue induced from immature endosperm of Oryza sauva L. Z Pflanzenphysiol 76, 444-449.
83 Nakel T, Tekleyohans DG, Mao YB, Fuchert G, Vo D, Gro?-Hardt R (2017). Triparental plants provide direct evidence for polyspermy induced polyploidy. Nat Commun 8, 1033.
84 Norstog K, Wall WE, Howland GP (1969). Cytological characteristics of ten-year-old rye-grass endosperm tissue cultures. Bot Gaz 130, 83-86.
85 Norstog KJ (1956). Growth of rye-grass endosperm in vitro. Bot Gaz 117, 253-259.
86 Nunes JD, Azevedo ALS, Pereira AV, Paula CMP, Campos JMS, Lédo FJS, Santos VB (2013). DNA elimination in embryogenic development of Pennisetum glaucum × Pennisetum purpureum(Poaceae) hybrids. Genet Mol Res 12, 4817-4826.
87 Pagliarini MS, Valle CB, Santos EM, Mendes DV, Bernardo ZH, Mendes-Bonato AB, Silva N, Calisto V (2012). Microsporogenesis in Brachiaria brizantha(Poaceae) as a selection tool for breeding. Genet Mol Res 11, 1309-1318.
88 Pécrix Y, Rallo G, Folzer H, Cigna M, Gudin S, Le Bris M (2011). Polyploidization mechanisms: temperature environment can induce diploid gamete formation in Rosa sp. J Exp Bot 62, 3587-3597.
89 Pepin GW, Funk CR (1971). Intraspecific hybridization as a method of breeding Kentucky bluegrass ( Poa pratemis L.) for turf. Crop Sci 11, 445-448.
90 Perera D, Barnes DJ, Baldwin BS, Reichert NA (2015). Direct and indirect in vitro regeneration of Miscanthus × giganteus cultivar freedom: effects of explant type and medium on regeneration efficiency. In Vitro Cell Dev Biol Plant 51, 294-302.
91 Ramsey J, Schemske DW (1998). Pathways, mechanisms, and rates of polyploid formation in flowering plants. Annu Rev Ecol Syst 29, 467-501.
92 Rhoades MM (1936). Note on the origin of triploidy in maize. J Genet 33, 355-357.
93 Sandfaer J (1975). The occurrence of spontaneous triploids in different barley varieties. Hereditas 80, 149-153.
94 Schwartz BM, Harris-Shultz KR, Contreras RN, Hans CS, Hanna WW, Milla-Lewis SR (2013). Creation of artificial triploid and tetraploid centipedegrass using colchicine and breeding. Int Turfgrass Soc Res J 12, 327-334.
95 Sehgal CB (1974). Growth of barley and wheat endosperm in cultures. Curr Sci 43, 38-40.
96 Sheidai M, Jafari S, Taleban P, Keshavarzi M (2009). Cytomixis and unreduced pollen grain formation in Alopecurus L. and Catbrosa Beauv.(Poaceae). Cytologia 74, 31-41.
97 Sieber VK, Murray BG (1979). The cytology of the genus Alopecurus(Gramineae). Bot J Linn Soc 79, 343-355.
98 Springer TL, Dewald CL, Sims PL, Gillen RL, Louthan VH, Cooper WJ, Taliaferro CM, Maura C, Pfaff S, Wynia RL, Douglas JL, Henry J, Bruckerhoff SB, Grinten M, Salon PR, Houck MJ, Esquivel RG (2006). Registration of 'Verl' eastern gamagrass. Crop Sci 46, 477.
99 Straus J, LaRue CD (1954). Maize endosperm tissue grown in vitro I. Culture requirements. Am J Bot 41, 687-694.
100 Suarez EY, Lopez AG, Naranjo CA (1992). Polyspermy versus unreduced male gametes as the origin of nonaploids (9x) common wheat plants. Caryologia 45, 21-28.
101 Sun S, Wu Y, Lin XY, Wang J, Yu JM, Sun Y, Miao YL, Li QP, Sanguinet KA, Liu B (2017). Hybrid weakness in a rice interspecific hybrid is nitrogen-dependent, and accompanied by changes in gene expression at both total transcript level and parental allele partitioning. PLoS One 12, e0172919.
102 Tamaoki T, Ullstrup JA (1958). Cultivation in vitro of excised endosperm and meristem tissues of corn. Bull Torrey Bot Club 85, 260-272.
103 Tan GY, Dunn GM (1973). Relationship of stomatal length and frequency and pollen-grain diameter to ploidy level in Bromus inermis Leyss. Crop Sci 13, 332-334.
104 Thomas H, Morgan WG, Humphreys MW (1988). The use of a triploid hybrid for introgression in Lolium species. Theor Appl Genet 76, 299-304.
105 Thomas TD, Chaturvedi R (2008). Endosperm culture: a novel method for triploid plant production. Plant Cell Tissue Organ Cult 93, 1-14.
106 Toda E, Ohnishi Y, Okamoto T (2016). Development of polyspermic rice zygotes. Plant Physiol 171, 206-214.
107 Toda E, Okamoto T (2016). Formation of triploid plants via possible polyspermy. Plant Signal Behav 11, e1218107.
108 Van Santen E, Hugessen PM, Casler MD (1991). Identification and frequency of tetraploid progeny from 2 x-4x and 4x-2x crosses in Dactylis. Genome 34, 273-278.
109 Wang C, Liu Q, Shen Y, Hua YF, Wang JJ, Lin JR, Wu MG, Sun TT, Cheng ZK, Mercier R, Wang KJ (2019). Clonal seeds from hybrid rice by simultaneous genome engineering of meiosis and fertilization genes. Nat Biotechnol 37, 283-286.
110 Wang X, Yamada T, Kong FJ, Abe Y, Hoshino Y, Sato H, Takamizo T, Kanazawa A, Yamada T (2011). Establishment of an efficient in vitro culture and particle bombardment-mediated transformation systems in Miscanthus sinensis Anderss, a potential bioenergy crop. GCB Bioenergy 3, 322-332.
111 Younis A, Hwang YJ, Lim KB (2014). Exploitation of induced 2 n-gametes for plant breeding. Plant Cell Rep 33, 215-223.
112 Yu CY, Kim HS, Rayburn AL, Widholm JM, Juvik JA (2009). Chromosome doubling of the bioenergy crop, Miscanthus × giganteus. GCB Bioenergy 1, 404-412.
113 Zeng RZ, Zhu J, Xu SY, Du GH, Guo HR, Chen JJ, Zhang SZ, Xie L (2020). Unreduced male gamete formation in Cymbidium and its use for developing sexual polyploid cultivars. Front Plant Sci 11, 558.
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