核农学报2018，Vol.32Issue(4)：760-770,11.DOI:10.11869/j.issn.100-8551.2018.04.0760
幼穗分化期低温条件下灌水对早稻温度调节、产量形成及相关生理特性的影响
Effects of Irrigation on Temperature Regulation, Yield Formation and Related Physiological Characteristics in Early Rice Under Low Temperature Conditions During Panicle Primordium Differentiation Stage
摘要
Abstract
In order to explore the technological approaches and its physiological and ecological mechanism for alleviating the damage of low temperature during panicle primordium differentiation stage,super hybrid early rice variety Ganxin 203 was used as test material,treatments were set to assess the effects of different irrigation methods and water layer depth on correlated temperature,physiological characteristics and yield formation in double-season early rice under low temperature conditions during panicle primordium differentiation stage.The 1 st treatment was draining during day and irrigating 4-5 cm water layer depth at night (H1).The 2nd treatment was draining during day and irrigating 8-10 cm water layer depth at night (H2).The 3rd treatment was 8-10 cm water layer depth day and night (H3).The 0-1 cm water layer depth day and night was as the control group (CK).The results showed that rice leaf temperature,soil layer temperature and canopy temperature under the different irrigation methods and water layer depth treatments were higher than CK,and the warming effect of treatment H2 was the best during the low temperature period.Leaf chlorophyll content (SPAD),net photosynthetic rate (Pn),transpiration rate (Tr),leaf stomatal conductance (Gs) and intercellular CO2 concentration(Ci) of rice plants decreased gradually with the treatments under the low temperature,while the smallest reduction range was the treatment H2.During the low temperature period,the increase range for the activities of superoxide dismutase (SOD) in treatment H2 were lower than other treatments,while its decrease range for the activity of catalase (CAT) and peroxidase (POD) was the lowest during the low temperature period.The increase range of malondialdehyde (MDA) and proline content in treatment H2 were lower than other treatments,while its soluble protein content was the highest.There were yield-increasing effects for the all irrigation measures of the heat preservation treatments and that the treatment H2 was the best.Yield of the first sowing date in 2014 year and second sowing date in 2015 year encountering low temperature obviously in treatment H2 increased by 5.66％ and 4.80％ compared to CK,respectively.It could be found from the yield components including the effective panicle numbers per plant,panicle length,seed setting rate and 1O00-grain mass were improved for the all treatments compared to CK.Overall,the application of draining during day and irrigating 8-10 cm water layer depth at night was the most effective agronomic measure to enhance the tolerance to low temperature during panicle primordium differentiation stage for double-season hybrid early rice.The results of this study provided a theoretical basis for the development of agronomic techniques to resist the low temperature of rice during panicle primordium differentiation stage.关键词
幼穗分化期/低温/灌水/温度调节效应/生理特性Key words
panicle primordium differentiation stage/low temperature/irrigation/temperature regulation effect/physiological characteristics引用本文复制引用
曹娜,熊强强,陈小荣,贺浩华,朱昌兰,傅军如,才硕,徐涛..幼穗分化期低温条件下灌水对早稻温度调节、产量形成及相关生理特性的影响[J].核农学报,2018,32(4):760-770,11.基金项目
国家公益性行业(气象)科研专项(GYHY201406025),国家公益性行业(农业)科研专项(201403002),江西农业大学研究生创新基金项目(NDYC2015-S004) （气象）
