Responses of Water Stress on Photosynthetic Trait and Antioxygenation System in Two High-yield Maize Cultivars

doi:10.7668/hbnxb.2015.06.015

Abstract

Abstract: To explore the physiological mechanism of high-yield maize varieties under water stress.The responses of biomass,photosynthetic characteristic and antioxygenation system were studied in two high yield maize hybrids,YD52 and MST526 under drought stresses in a pot experiment.The results showed that drought stress inhibited the growth of maize,lowered the leaf net photosynthetic rate (Pn),stomatal conductance (Cond),transpiration rate (Tr),intercellular CO₂ concentration (Ci),SPAD,Maximum PSⅡ quantum yield (Fv/Fm),PSⅡ actual quantum yield (Φ_PSⅡ) and electron transport rate (ETR);increased the levels of hydrogen peroxide (H₂O₂) and malondialdehyde (MDA);enhanced the activities of superoxide dismutase (SOD),catalase(CAT),ascorbate peroxidase(APX)and peroxidase (POD).Compared the two varieties,MST526 showed higher biomass accumulation and values of maximum leaf net photosynthetic rate (Pn);and lower content of hydrogen peroxide (H₂O₂) and malondialdehyde (MDA);and higher autioxidant enzyme activities (SOD,CAT and APX).Correlation analysis showed that water stress could significantly decrease the biomass of two maize hybrids,possibly caused by reduction in the photosynthetic capacity of plants.The water stress damaging effects on plant photosynthesis were minimal on the MST526 compared to YD52.Under drought stress the MST526 maintained higher photochemical efficiency,stronger antioxidant capacity and lighter oxidative damage that might be the major physiological traits in the adaptive capacity to drought conditions.

Key words: Maize, Water stress, Photosynthetic characteristic, Antioxidant system

CLC Number:

S513.01

WANG Yu-fen, LI Juan, LU Zhan-yuan, DU Yong-chun, ZHANG De-jian. Responses of Water Stress on Photosynthetic Trait and Antioxygenation System in Two High-yield Maize Cultivars[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2015, 30(6): 97-104. doi: 10.7668/hbnxb.2015.06.015.

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