生态学杂志2012，Vol.31Issue(12)：3102-3108,7.
盐胁迫对不同基因型(品系)甘薯苗期光合特性的影响
Effects of salt stress on the seedling' s photosynthetic characteristics of different genotypes sweet potato
摘要
Abstract
Taking the seedlings of 12 genotypes sweet potato as test materials, this paper studied their photosynthetic characteristics and plant growth under salt stress (0 and 85 mmol·L-1 of NaCl) for 20 days. As compared with the control, 85 mmol·L-1 of NaCl inhibited the growth of the seedlings. Of all the 12 genotypes, the "Zhezi No. 1" , "Xushu No. 18" , and "Xushu No. 22" were lesser impacted, while the " Yanshu 25" and "Langshu 7-12" were damaged more seri-ously. Under salt treatment, the leaf relative water content (RWC) of different genotypes sweet potato was above 75% , and no significant differences were found among the genotypes. The leaf chlorophyll content index ( CCI) , net photosynthetic rate (Pn) , stomatal conductance ( Gs) , and instantaneous water-use efficiency (iWUE) decreased under the treatment of salt. The "Zhezi No. 1" and " Xushu No. 18" had the highest values of CCI and Pn, but the Gs of " Zhezi No. 1" was greatly impacted by salt, with the salinity susceptibility index (SSI) being22%. The "Yan-shu No. 25 " was sensitive to NaCl, and had lower SSI of CCI, Pn, and iWUE than the other geno-types. The main reason for the reduction in the photosynthetic rate of "Xushu No. 18" , "Chuan No. 211" , and "Zhezi No. 1" was stomatal limitation, but the three genotypes showed higher photosynthetic efficiency under salt stress. The other nine genotypes were of non-stomatal limita-tion , but their salt susceptibility differed. In terms of physiological and biochemical indices, the "Zhezi No. 1" and "Xushu No. 18" showed more tolerance against NaCl stress.关键词
甘薯/盐胁迫/光合特性/生理响应Key words
sweet potato/salt stress/photosynthetic characteristics/physiological response分类
农业科技引用本文复制引用
戚冰洁,汪吉东,马洪波,陈杰,张永春,徐阳春,常志州..盐胁迫对不同基因型(品系)甘薯苗期光合特性的影响[J].生态学杂志,2012,31(12):3102-3108,7.基金项目
现代农业产业技术体系建设专项(CARS-11-B-15)、公益性行业农业专项(200903001)和IPNI国际合作项目(JIANGSU-11)资助. （CARS-11-B-15）
