Effects of Gibberellin Presoaking on Maize Germination under Chill

doi:10.7668/hbnxb.2018.04.021

Abstract

Abstract: The objective of this experiment is to study the effects of chill and drought stresses on seed germination characteristics, and the effects of stresses resistance by presoaking with gibberellin (GA₃)under different concentrations. An experiment was conducted in order to investigate the effect of chill stress and chill-drought double stresses on gemination and seedling growth, the difference of the effects of presoaking with GA₃ was also analyzed. Two varieties of Zhengdan 958 (ZD958 with good cold resistence)and CB15098 (CB15098 with poor cold resistence)were presoaked in gibberellin solution with three concentrations (10, 50, 100 mg/L)before sowing. The result showed that the effect of gibberellin presoaking on dry and fresh weight of shoot exhibited the opposite effect under two kinds of stress:the promoting effect under chill stress and the inhibition effect under double stresses. ZD958 had better chill resistance in compared with CB15098, and shoot elongation of ZD958 was promoted by presoaking with GA₃ under both chill and chill-drought double stresses. GA₃ presoaking increased germinability of CB15098 under both stresses as well as its shoot length under double stresses, contrary to its decreased plant length under chill stress. The responses of germination, fresh and dry weight and length of shoot of ZD958 was significantly higher than CB15098. Lower concentration of GA₃ presoaking was recommended for maize variety under chill and drought stresses. High concentration of gibberellin solution was recommended for seed soaking under single chill stress, and low concentration of gibberellin solution for seed soaking was better for maize under chill and drought stress.

Key words: Maize, Gibberellin, Chill, Drought, Seedling stage

CLC Number:

S513.01

XU Gaoping, LIU Xiufeng, YUAN Wenya, WANG Pu, LOU Chenjun, YANG Zhaoshun. Effects of Gibberellin Presoaking on Maize Germination under Chill[J]. Acta Agriculturae Boreali-Sinica, 2018, 33(4): 147-152. doi: 10.7668/hbnxb.2018.04.021.

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