Low soil temperature and drought stress conditions at flowering stage affect physiology and pollen traits of rice

作     者：RAO Gang-shun Umair Ashraf KONG Lei-lei MO Zhao-wen XIAO Li-zhong ZHONG Ke-you Fahd Rasul TANG Xiang-ru 

作者机构：Department of Crop Science and Technology College of Agriculture South China Agricultural University/Scientific Observing and Experimental Station of Crop Cultivation in South China Minist ry of Agriculture and Rural Affairs Guangzhou 510642 P.R.China Department of Agronomy University of Agriculture Faisalabad 38040 Pakistan 

出 版 物：《Journal of Integrative Agriculture》 (农业科学学报（英文版）)

年 卷 期：2019年第18卷第8期

页      面：1859-1870页

核心收录：

学科分类：0710[理学-生物学] 0832[工学-食品科学与工程（可授工学、农学学位）] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 1004[医学-公共卫生与预防医学(可授医学、理学学位)] 0905[农学-畜牧学] 0906[农学-兽医学] 09[农学] 0901[农学-作物学] 0703[理学-化学] 0902[农学-园艺学] 0713[理学-生态学] 

基　　金：supported by the National Natural Science Foundation of China (31271646) the Natural Science Foundation of Guangdong Province, China (8151064201000017) the Agricultural Research Projects of Guangdong Province, China (2011AO20202001) the Agricultural Standardization Project of Guangdong Province, China (4100 F10003) 

主　　题：antioxidant enzymes cold stress pollen traits photosynthesis rice yield 

摘      要：Low temperature and drought stress are the major constraints in rice productivity worldwide. This study investigated the influence of low soil temperature and/or drought stress on physiology and pollen traits of two rice genotypes viz., Guinongzhan and Yueza 763 at flowering stage. The experiment included four treatments, i.e., under the greenhouse natural growth conditions (UC) taken as control, drought stress (DS), the soil water potential was kept at ?0.035 to ?0.045 MPa (DS), low soil temperature (LT) maintained at 19 to 21℃, combined LT and DS (LT+DS, LD). Results showed that LT, DS, and LD substantially reduced net photosynthetic rate (Pn) and the maximal photochemical efficiency of PSII (Fv/Fm), whilst transpiration rate (Tr) was markedly enhanced by under LT in both rice genotypes. The malondialdehyde (MDA) contents were enhanced under LT, DS, and LD in Guinongzhan, whilst the activities of superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT) were regulated by LT, DS, and LD in both rice genotypes. Furthermore, anther dehiscence rate, pollen numbers on stigma, pollen viability and pollen germination rate, and anther starch contents were obviously reduced under LT and DS of both rice genotypes. Stress conditions substantially reduced the yield and yield components, i.e., effective panicles, seed set percentage, grain/panicles, 1000-grain weight, and grain yield of both genotypes and the effects were more apparent in Guinongzhan than those in Yueza 763 whilst combined LT and DS proved more damaging than individual stress.