The influence of brassinosteriod increased heat tolerance in rice
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Abstract
Climate change due to global warming results in rising global temperatures and also affects rice yield in off-season in Northeast Thailand. The increasing temperature at 40oC leads to rice sterile, rice yield reduction, net photosynthetic rate reduction and intracellular membrane and photosynthetic pigments damage. Thus, the application of brassinosteroid (Br), which is a plant growth regulator in the steroid group, was studied in rice grown in greenhouse. This experiment used completely randomized design (CRD) with 4 replications. Rice namely N22 at 50% flowering was sprayed by brassinosteroid at 0 (distilled water; DW), 0.05, 0.1 and 0.5 nM and exposed to high temperature at day/night (42/32 ºC) for 7 days (H) and temperature in greenhouse (UH). The study showed Br application increased high temperature tolerance by increased in net photosynthetic rate and chlorophyll contents and maintained membrane stability. This suggested that Br stimulated antioxidant enzyme for scavenging free radicals and maintaining thylakoid membrane and cellular membrane resulted in undamaged in chlorophyll embedded in thylakoid membrane and increased in photosynthesis. It also induced increased the accumulation of assimilates in rice seeds resulted in increased in rice yield and tolerated to high temperature condition.
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References
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