Protective Effect of Exogenous PGRs on Chlorophyll Fluorescence and Membrane Integrity of Rice Seedlings under Chilling Stress

摘要

The effects of chilling stress on chlorophyll content, chlorophyll fluorescence and Malondialdehyde (MDA; a biomarker for lipid peroxidation in membrane) were evaluated in rice (Oryza sativa) seedlings during chilling stress and subsequent recovery phase using a phytotron. The effects of Indole-3-Acetic Acid (IAA), Abscisic Acid (ABA) and Kinetin (CK) exogenously foliar applied to three rice genotypes differing in cold tolerance were probed. Under chilling stress reduced levels of photo inhibition and MDA due to hormone application in relation to no hormone treatment demonstrated the significant effect of applied hormones to induce chilling tolerance in the genotypes. There were different effects of hormones on genotypes and even on organs (root and shoot) in the case of MDA content, moreover the strategy for cold tolerance differed among the genotypes.