Journal de génétique végétale et de sélection

Abstrait

Endogenous Jasmonates Stimulate Plant Growth by Inhibiting Mitosis

Williams John

When plants square measure repeatedly harmed their growth is scrawny and also the size of organs like leaves is greatly reduced. The premise of this result isn't well-understood but, even if it reduces yield of crops harmed by herbivory, and produces dramatic effects exemplified in decorative tree plants. we've got investigated the genetic and physiological basis of this “bonsai effect” by repeatedly wounding leaves of the model plant genus Arabidopsis [1]. This treatment scrawny growth by five hundredth and magnified the endogenous content of jasmonate (JA),a growth substance, by seven-fold. Considerably, recurrent wounding didn't stunt the expansion of the leaves of mutants unable to combine JA, or unable to retort to JA as well as coi1, jai3, myc2, however not jar1. The scrawny growth didn't result from reduced cell size, however resulted instead from reduced cell range, and was related to reduced expression of CycB1;2 [2]. Wounding caused general disappearance of constitutively expressed JAZ1::GUS. Wounding conjointly activates plant immunity. we have a tendency to show that a cistron, 12-oxophytodienoate enzyme, that catalyses a step in JA biogenesis, and that we have a tendency to make sure isn't needed for defence, is but needed for wound-induced flight. Our knowledge recommend that intermediates within the JA synthesis pathway activate defence, however a primary perform of wound-induced JA is to stunt growth through the suppression of cellular division [3].