Roles of Gibberellins and Abscisic Acid in Regulating Germination of Suaeda salsa Dimorphic Seeds Under Salt Stress

Frontiers in Plant Science
Weiqiang LiLam-Son P Tran

Abstract

Seed 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 deacti...Continue Reading

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Citations

Jul 18, 2015·Plant Physiology and Biochemistry : PPB·Fengxia WangJie Song
Apr 11, 2019·International Journal of Molecular Sciences·Junpeng LiMin Chen
Dec 3, 2016·Frontiers in Plant Science·Jian-Ping AnYu-Jin Hao
Nov 6, 2018·Frontiers in Plant Science·Ranran LiuJie Song
Jun 9, 2018·International Journal of Molecular Sciences·Jibiao FanLiang Chen

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Methods Mentioned

BETA
enzyme-linked immunosorbent assay
salt stress

Software Mentioned

GA20ox
GA3ox

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