Seed dormancy and germination are attractive topics in the fields of plant molecular biology as they are key stages during plant growth and development. Seed dormancy is intricately regulated by complex networks of phytohormones and numerous key genes, combined with diverse environmental cues. The transition from dormancy to germination is a very important biological process, and extensive studies have demonstrated that phytohormones abscisic acid (ABA) and gibberellin acid (GA) are major determinants. Consequently, the precise balance between ABA and GA can ensure that the seeds remain dormant under stress conditions and germinate at optimal times. Here we review the role of auxin in seed dormancy and germination. Auxin is one of the classic phytohormones effective during tropism growth and tissue differentiation. Recent studies, however, show that auxin possesses positive effects on seed dormancy, which suggests that auxin is the second phytohormone that induces seed dormancy, besides ABA. We will focus on the synthetic effects in detail between auxin and ABA pathways on seed dormancy and propose future research directions.
Haiwei Shuai, Yongjie Meng, Xiaofeng Luo, Feng Chen, Ying Qi, Wenyu Yang, Kai Shu
. The roles of auxin in seed dormancy and germination[J]. Hereditas(Beijing), 2016
, 38(4)
: 314
-322
.
DOI: 10.16288/j.yczz.15-464
[1] Bewley JD. Seed germination and dormancy. Plant Cell , 1997, 9(7): 1055-1066.
[2] Baskin JM, Baskin CC. A classification system for seed dormancy. Seed Sci Res , 2004, 14(1): 1-16.
[3] Woolhouse HW. Physiology and biochemistry of seeds in relation to germination. Vol. 1: development, germination and growth. by Bewley JD, Black M. J Ecol , 1980, 68(1): 315.
[4] Simsek S, Ohm JB, Lu HY, Rugg M, Berzonsky W, Alamri MS, Mergoum M. Effect of pre-harvest sprouting on physicochemical changes of proteins in wheat. J Sci Food Agr , 2014, 94(2): 205-212.
[5] Shu K, Meng YJ, Shuai HW, Liu WG, Du JB, Liu J, Yang WY. Dormancy and germination: how does the crop seed decide? Plant Biol , 2015, 17(6): 1104-1112.
[6] Weyers JDB, Paterson NW. Plant hormones and the control of physiological processes. New Phytol , 2001, 152(3): 375-407.
[7] Shu K, Liu XD, Xie Q, He ZH. Two faces of one seed: hormonal regulation of dormancy and germination. Mol Plant , 2016, 9(1): 34-45.
[8] Ali-Rachedi S, Bouinot D, Wagner MH, Bonnet M, Sotta B, Grappin P, Jullien M. Changes in endogenous abscisic acid levels during dormancy release and maintenance of mature seeds: studies with the Cape Verde Islands ecotype, the dormant model of Arabidopsis thaliana . Planta , 2004, 219(3): 479-488.
[9] Karssen CM, Brinkhorst-van der Swan DLC, Breekland AE, Koornneef M. Induction of dormancy during seed development by endogenous abscisic acid: studies on abscisic acid deficient genotypes of Arabidopsis thaliana (L.) Heynh. Planta , 1983, 157(2): 158-165.
[10] Seo M, Hanada A, Kuwahara A, Endo A, Okamoto M, Yamauchi Y, North H, Marion-Poll A, Sun TP, Koshiba T, Kamiya Y, Yamaguchi S, Nambara E. Regulation of hormone metabolism in Arabidopsis seeds: phytochrome regulation of abscisic acid metabolism and abscisic acid regulation of gibberellin metabolism. Plant J , 2006, 48(3): 354-366.
[11] Frey A, Effroy D, Lefebvre V, Seo M, Perreau F, Berger A, Sechet J, To A, North HM, Marion-Poll A. Epoxycarotenoid cleavage by NCED5 fine-tunes ABA accumulation and affects seed dormancy and drought tolerance with other NCED family members. Plant J , 2012, 70(3): 501-512.
[12] Frey A, Audran C, Marin E, Sotta B, Marion-Poll A. Engineering seed dormancy by the modification of zeaxanthin epoxidase gene expression. Plant Mol Biol , 1999, 39(6): 1267-1274.
[13] Martínez-Andújar C, Ordiz MI, Huang ZL, Nonogaki M, Beachy RN, Nonogaki H. Induction of 9-cis-epoxycarotenoid dioxygenase in Arabidopsis thaliana seeds enhances seed dormancy. Proc Natl Acad Sci USA , 2011, 108(41): 17225-17229.
[14] Shu K, Zhang HW, Wang SF, Chen ML, Wu YR, Tang SY, Liu CY, Feng YQ, Cao XF, Xie Q. ABI4 regulates primary seed dormancy by regulating the biogenesis of abscisic acid and gibberellins in Arabidopsis . PLoS Genet , 2013, 9(6): e1003577.
[15] Koornneef M, van der Veen JH. Induction and analysis of gibberellin sensitive mutants in Arabidopsis thaliana (L.) heynh. Theor Appl Genet , 1980, 58(6): 257-263.
[16] Finkelstein R, Reeves W, Ariizumi T, Steber C. Molecular aspects of seed dormancy. Annu Rev Plant Biol , 2008, 59(1): 387-415.
[17] Liu XD, Zhang H, Zhao Y, Feng ZY, Li Q, Yang HQ, Luan S, Li JM, He ZH. Auxin controls seed dormancy through stimulation of abscisic acid signaling by inducing ARF-mediated ABI3 activation in Arabidopsis . Proc Natl Acad Sci USA , 2013, 110(38): 15485-15490.
[18] Bonner J, Bandurski RS. Studies of the physiology, pharmacology, and biochemistry of the auxins. Annu Rev Plant Biol , 1952, 3: 59-86.
[19] Simon S, Petrášek J. Why plants need more than one type of auxin. Plant Sci , 2011, 180(3): 454-460.
[20] Reinhardt D. Vascular patterning: more than just auxin? Curr Biol , 2003, 13(12): R485-R487.
[21] Bohn-Courseau I. Auxin: a major regulator of organogenesis. CR Biol , 2010, 333(4): 290-296.
[22] Kepinski S, Leyser O. Plant development: auxin in loo
