Modulation by phenolic compounds of ABA-induced inhibition of mustard (Brassica juncea L. cv. RLM 198) seed germination.
Exogenous abscisic acid (ABA) inhibited the germination of B. juncea seeds in a concentration dependent manner. As revealed in a time-course study, the ABA-induced inhibition got progressively alleviated with the lapse of time following ABA treatment possibly due to metabolic conversion of applied ABA in the seed tissue. A simultaneous application of certain phenolic compounds namely, p-coumaric-, vanillic-, gallic-, and chlorogenic acid (but not caffeic acid) also caused an alleviation of ABA effect. Of the above two patterns of recovery, the phenolic-dependent alleviation of ABA effect was apparent much earlier (24-48 hr treatment) than the time-dependent one (72 hr). It is likely that phenolics could accelerate ABA metabolism in the seed tissue leading to an early recovery from ABA-induced inhibition.
Sharma
Shashi
S
Department of Biosciences, H.P. University, Shimla 171005, India. sharma_shashi2@rediff.com
Sharma
Shanti S
SS
Rai
Vinay K
VK
D000040:Abscisic Acid / Q000494:pharmacology*; D018525:Germination / Q000187:drug effects* / Q000502:physiology; D009149:Mustard Plant / Q000187:drug effects / Q000254:growth & development*; D010636:Phenols / Q000494:pharmacology*; D012639:Seeds / Q000187:drug effects / Q000254:growth & development*; D013997:Time Factors
D010636:Phenols; D000040:Abscisic Acid