Responses of Photosynthetic Rate and Antioxidant Enzyme Activity in Wheat Spike to Light Radiation Intensity

doi:10.7668/hbnxb.20190982

Abstract

Abstract: In order to provide a theoretical support for the selection and breeding of high-yielding wheat varieties with high light efficiency and high stress resistance in the Huang-huai region, a field experiment with three wheat varieties was carried out to investigate the responses of photosynthetic rate of spike and antioxidant enzyme activity of glume to the change of light radiation intensity in one day. The results showed that the photosynthetic rate (Pn) of spikes and the activities of superoxide dismutase(SOD), catalase(CAT) and ascorbate peroxidase(APX) of glumes of Bainong 4199 (BN 4199), Aikang 58 and Zhoumai 18 all changed with the change of light radiation intensity from weak to strong to weak during the day at different growth stages.They showed a trend of rising first and then falling. And the content of malondialdehyde(MDA) showed a trend of falling first and then rising with the change of light radiation intensity. From the comparison of varieties, the spikes photosynthetic rates of BN 4199 were 15.72%, 27.99%,28.01% and 62.46%; 33.49%, 15.09%,20.94% and 17.97%; 37.90%, 21.41%,6.30% and 40.11%; 9.34%, 10.70%,17.27% and 19.32% higher than those of Aikang 58, and were 12.45%, 19.74%,25.36% and 58.58%;14.89%, 3.13%,22.52% and 13.48%; 40.64%, 25.93%,9.70% and 10.89%; 13.13%, 21.47%,28.34% and 22.53% higher than those of Zhoumai 18 at 7:30, 11:30,13:30 and 17:30 of heading stage, flowering stage, 10 days after flowering and 20 days after flowering. The reason is that the glumes of BN 4199 have higher antioxidant enzyme activities such as SOD, CAT and APX under different light conditions than Aikang 58 and Zhoumai 18. Higher antioxidant enzyme activity reduces the MDA content of BN 4199 glumes, and enables the ear to make full use of a small amount of weak light or dissipate excess light energy, thereby adapting itself to different levels of light radiation.

Key words: Wheat spike, Photosynthetic rate, Glume, Antioxidant enzyme activity, Light radiation intensity

CLC Number:

S512.01

DING Weihua, FENG Suwei, RU Zhengang, HU Tiezhu, SUN Haili, LI Tingting, CHEN Xiangdong. Responses of Photosynthetic Rate and Antioxidant Enzyme Activity in Wheat Spike to Light Radiation Intensity[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2020, 35(3): 94-101. doi: 10.7668/hbnxb.20190982.

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