Effects of Root Application of γ-aminobutyric Acid on Plant Growth, Photosynthetic Characteristics,Antioxidant Physiology and Yield of Waxy Corn

doi:10.7668/hbnxb.20192249

Abstract

Abstract: The aim of this work was to evaluate the effects of γ-aminobutyric acid(GABA)on waxy maize yield formation and its photosynthetic physiology, for guide the application of chemical control technology to improve the yield of waxy corn.The waxy maize varieties Yuecainuo 2, Yuebaitiannuo 7, and Jingkenuo 928 were used as materials, the effects of root application of GABA treatment(RS)on yield and photosynthetic physiology of waxy maize were studied, the root irrigation of water was taken as control(CK).Compared with CK, RS treatment increased naked ear yield of waxy maize varieties(1.62% -4.97%), the bract leaves yield of waxy maize varieties was reduced(16.52% -23.09%), among them, the naked ear yield and the bract leaves yield of Yuebaitiannuo 7 changed significantly. RS treatment improved the net photosynthetic rate and transpiration rate at both filling stage and mature stage, improved the leaf aging index at mature stage. The spike length, number of grains per row, and number of grains per spike were increased to some extent.The heading stage, powder period, and the spinning stage were advanced 1-2 d.The CAT activity in functional leaves was significantly improved under RS treatment but the MDA content in in functional leaves was significantly decreased under RS treatment. A significant positive correlation was observed between naked ear yield and fresh bracts yield, ratio of fresh bracts to ears and leaves, spike length, number of grains per row, number of grains per spike, and leaf aging index at filling stage(P<0.05).Root application of GABA treatment during booting stage can improve the naked ear yield of waxy maize varieties by regulating growth, photosynthetic physiology, yield formation, and the ratio of fresh bracts to ears and leaves.

Key words: Waxy corn, Yield, Gamma-aminobutyric acid, Root application, Photosynthesis

CLC Number:

S513.01

LI Wu, LI Chunyan, LI Guangyu, LIANG Minyi, LI Yuliang, WEN Tianxiang, TU Panfeng, LIU Jianhua. Effects of Root Application of γ-aminobutyric Acid on Plant Growth, Photosynthetic Characteristics,Antioxidant Physiology and Yield of Waxy Corn[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2021, 36(S1): 72-80. doi: 10.7668/hbnxb.20192249.

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