TITLE:
Light Regulated Osa-miR169e Is Implicated during Priming under High Temperature Stress in Rice
AUTHORS:
Akhilesh Kumar Kushawaha, Ambreen Khan, Sudhir Kumar Sopory, Neeti Sanan-Mishra
KEYWORDS:
Abiotic Stress, Heat Priming, Light, Acclimation, MicroRNA
JOURNAL NAME:
American Journal of Plant Sciences,
Vol.10 No.9,
September
29,
2019
ABSTRACT: Plants face biotic and abiotic stresses during their
entire life cycle, which leads to the loss in crop productivity. It has been shown that a relatively shorter
exposure to heat stress, called priming, results in better adaptation of plants
under subsequent stresses, which plants may face. While rice plants in nature
often encounter high temperature stress conditions, the strategies to cope with
those are poorly understood. We identified the involvement of microRNA pathways
in the adaptation to heat stress (HS) at the physiological and molecular
levels. It was observed that osa-miR169 levels are altered after HS and in
response to light conditions. Its expression was also regulated by heat priming
during anthesis and effectively responds to the successive exposure to high
temperature stress during grain filling in rice. Osa-miR169 targets nuclear
factor Y (NF-Y). We propose that osa-miR169: NF-Y
regulatory module may be important for HS memory induced during high
temperature priming and thus may serve to integrate stress responses with light
regulated development. The future study in this direction will be useful to
understand how plants acclimatize to the changing environment and thus help in
generating stress tolerant crops.