Show simple item record

AuthorLi, Weiqiang
AuthorYamaguchi, Shinjiro
AuthorKhan, M. Ajmal
AuthorAn, Ping
AuthorLiu, Xiaojing
AuthorTran, Lam-Son P.
Available date2016-11-01T10:59:06Z
Publication Date2016-01-13
Publication NameFrontiers in Plant Science
Identifierhttp://dx.doi.org/10.3389/fpls.2015.01235
CitationLi W, Yamaguchi S, Khan MA, An P, Liu X and Tran L-SP (2016) Roles of Gibberellins and Abscisic Acid in Regulating Germination of Suaeda salsa Dimorphic Seeds Under Salt Stress. Front. Plant Sci. 6:1235.
URIhttp://hdl.handle.net/10576/4949
AbstractSeed heteromorphism observed in many halophytes is an adaptive phenomenon toward high salinity. However, the relationship between heteromorphic seed germination and germination-related hormones under salt stress remains elusive. To gain an insight into this relationship, the roles of gibberellins (GAs) and abscisic acid (ABA) in regulating germination of Suaeda salsa dimorphic brown and black seeds under salinity were elucidated by studying the kinetics of the two hormones during germination of the two seed types with or without salinity treatment. Morphological analysis suggested that brown and black are in different development stage. The content of ABA was higher in dry brown than in black seeds, which gradually decreased after imbibition in water and salt solutions. Salt stress induced ABA accumulation in both germinating seed types, with higher induction effect on black than brown seeds. Black seeds showed lower germination percentage than brown seeds under both water and salt stress, which might be attributed to their higher ABA sensitivity rather than the difference in ABA content between black and brown seeds. Bioactive GA4 and its biosynthetic precursors showed higher levels in brown than in black seeds, whereas deactivated GAs showed higher content in black than brown seeds in dry or in germinating water or salt solutions. High salinity inhibited seed germination through decreasing the levels of GA4 in both seeds, and the inhibited effect of salt stress on GA4 level of black seeds was more profound than that of brown seeds. Taken together higher GA4 content, and lower ABA sensitivity contributed to the higher germination percentage of brown seeds than black seeds in water and salinity; increased ABA content and sensitivity, and decreased GA4 content by salinity were more profound in black than brown seeds, which contributed to lower germination of black seeds than brown seeds in salinity. The differential regulation of ABA and GA homeostases by salt stress in dimorphic seeds might provide a strategy for S. salsa plants to survive adverse environmental conditions.
SponsorNational High Technology R&D program of China (Project Code: 2013BAC02B01)
Languageen
PublisherFrontiers Media
SubjectGermination
Suaeda salsa
abscisic acid
dimorphic seeds
gibberellins
salt stress
TitleRoles of Gibberellins and Abscisic Acid in Regulating Germination of Suaeda salsa Dimorphic Seeds Under Salt Stress
TypeArticle
Volume Number6
ESSN1664-462X
dc.accessType Open Access


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record