Effect of a Sudden Change from Drought to Waterlogging at the Tilleringor Young Spiking Stage on Yield and Grain of Hybrid Rice
XIONG Qiangqiang
SHEN Tianhua
ZHONG Lei
CHEN Xiaorong
ZHU Changlan
PENG Xiaosong
HE Haohua
Abstract：The effect of drought-flooding alternation on yield and grain quality of hybrid early rice was studied in this paper. We took Ganxin203 variety as the model plant, growing it in pots. Different drought-flooding alterna-tions were examined:drought without flooding, flooding without drought, and a sudden change from drought to flooding attilleringor young spiking stage respectively. The results showed that a sudden change from drought to flooding at the tillering stage had a small impact on rice quality, and that the only difference was in the chalkiness of the rice which, in the treatment, was significantly lower than that in the control (without drought and flooding). However, a quick switch from drought to flooding at young spiking stage significantly reduced the head rice rate, grain length and gel consistency by 20.05%, 19.70%and 29.35%, respectively, compared with the control. There was no significant difference in amylose content, compared with the control. A sudden change from drought to flooding increased chalky grain rate and chalkiness by 5.64%and 20.39%respectively, while decreased the ap-pearance, processing quality and taste of the rice. The drought and flooding resulted in yield loss per plant; a change from drought to flooding at tillering and young spiking stage led to a reduction in yield by 30.27%and 43.37%. Water stress at tillering stage mainly resulted in an decrease in the number of grains per panicle and over-all panicles per plant, while water stress at young spiking stage led to a decrease in total number of grains per pan-icle and the maturing rate. Overall, a sudden change from drought to flooding at young spiking stage detrimental-ly affects rice production.
Keywords：super hybrid early ricetillering stageyoung panicle differentiation stagedrought-flooding alterna-tionqualityrice yield
Publication Date：2017-10-01
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：7( 39-45 )