作物学报2011，Vol.37Issue(5)：876-881,6.DOI:10.3724/SP.J.1006.2011.00876
旱稻×稗草杂交后代YF2-1光合作用气体交换、叶绿素荧光和抗氧化酶系统对渗透胁迫的响应
Response of Gas Exchange, Chlorophyll a Fluorescence and Anti-oxidation Enzymes Activities to Osmotic Stress in an Upland Rice Progeny YF2-1 Derived from Oryza sativa x Echinochloa caudata
摘要
Abstract
Wild species generally have higher stress resistance than cultivated crops and are utilized as the sources of stress resistance genes in stress resistance improvement of crops.In rice, its wild relatives have been used to improve photosynthesis, yield and stress resistance.YF2-1 is obtained by distant cross between Oryza sativa and Echinochloa caudate.In order to assess its osmotic stress resistance on physiological level, gas exchange, chlorophyll a fluorescence and antioxidation enzyme activities under osmotic stress simulated by PEG-6000 were studied in seedlings of upland rice YF2-1 and H65.The results showed that YF2-1 maintained higher net photosynthetic rate and stomatal conductance under osmotic stress condition, indicating YF2-1 suffered less inhibition in photosynthesis.This may be related to its higher water retaining capacity and its effective functions for high excessive light energy dispersing (higher NPQ) and higher activities of anti-oxidation enzymes SOD, POD, and CAT, effectively clearing active oxygen species (AOS) produced by excessive light energy.Thc result shows that the distant crossing may increase the resistance to osmotic stress in rice.关键词
旱稻/远缘杂交/光合特征/渗透胁迫Key words
Upland rice/ Distant crossing/ Photosynthetic characteristics/ Osmotic stress引用本文复制引用
丁在松,王春艳,关东明,赵凤悟,赵明..旱稻×稗草杂交后代YF2-1光合作用气体交换、叶绿素荧光和抗氧化酶系统对渗透胁迫的响应[J].作物学报,2011,37(5):876-881,6.基金项目
本研究由国家重点基础研究发展计划(973计划)项目(2009CB118605)和国家科技支撑计划粮食丰产工程项目(2006BAD02A13)资助. （973计划）
