Effects of exogenous salicylic acid and abscisic acid on growth, photosynthesis and antioxidant system of rice

The key function of plant growth regulators is to adjust the and development plants adapt changing environment, which plays a vital role in yield crops. This study was aimed evaluate ability foliar application salicylic acid (SA) abscisic (ABA) regulate rice (Oryza sativa L.) quality at seedling stage reproductive stage. two cultivars Wanshengyoutianhong-4 (W4) Huanghuazhan (HZ) were sprayed with SA (100 mg L-1) ABA (4 two-leaf stage, their effects on morphological growth, physiological characteristics, malondialdehyde (MDA), osmotic substances, protective enzyme activities, photosynthesis components studied. Results indicated that significantly increased antioxidant activities; MDA content dropped (p < 0.05) W4. While inhibited characteristics HZ. Additionally, net photosynthesis, stomatal conductance, transpiration rate, water use efficiency apparent mesophyll conductance improved both heading as well grain weight. In conclusion, spray enhanced induced an increase activities reduced oxidative damage hybrid cultivar but not conventional Meanwhile, photosynthetic parameters weight slightly These results served theoretical basis technical support for chemical regulation cultivation practices rice.