草业学报2011，Vol.20Issue(1)：82-88,7.
KN03对NaCl胁迫下两菊芋品种幼苗生长及光合能力的影响
Effects of KNO3 on the growth and photosynthetic capacity of two varieties of Helianthus tuberosus seedlings under NaCl stress
摘要
Abstract
Effects of KNO3 under salt stress on the biomass and photosynthetic capacity of two varieties of Helianthus tuberosus seedlings (Nanyu No. 1 and Qingyu No. 2) treated with NaCl (0 and 150 mmol/L) and different levels of KNO3(2.5, 5, 10, 20 and 30 mmol/L) were studied by pot/sand experiments in a greenhouse. 1) Compared with the control (NaCl 0 mmol/L), the biomass, chlorophyll (Chl) content, and net photosynthetic rate (Pn) of two varieties of H. tuberosus seedlings declined as the KNO3 concentrations increased. 2) Under 150 mmol/L NaCl stress, the K+/Na+ (shoot and root) ratio and chlorophyll content of different varieties of H. tuberosus seedlings increased with increasing concentrations of KNO3. 3) Sensitivities of KNO3 for alleviating salt injury differed between varieties. Effects of KNO3 (20 and 10 mmol/L) significantly alleviated salt injury caused by 150 mmol/L NaCl stress for Nanyu No. 1 and Qingyu No. 2. 4) Under the same treatment,KNO3 alleviated injury caused by 150 mmol/L NaCl stress better in Nanyu No. 1 than in Qingyu No. 2. In conclusion, suitable exogenous KNO3 can alleviate salt injury and promote photosynthetic capacity and biomass accumulation in varieties of H. tuberosus seedlings.关键词
菊芋/NaCl胁迫/KNO3/光合能力Key words
Helianthus tuberosus/ NaCl stress/ KNO3/ photosynthetic capacity分类
农业科技引用本文复制引用
黄增荣,隆小华,刘兆普,耿守保,叶慧君,陆艳..KN03对NaCl胁迫下两菊芋品种幼苗生长及光合能力的影响[J].草业学报,2011,20(1):82-88,7.基金项目
国家科技支撑项目(2009BADA3B04-8、2008BAD95B05).国家"948"项目(2009-Z9),国家"863"计划重点资助项目(2007AA091702)和公益性行业(农业)科研专项经费项目(200903001-05)资助. （2009BADA3B04-8、2008BAD95B05）
