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

作　　者：戚冰洁[1,2] 汪吉东[2] 马洪波[2] 陈杰[2] 张永春[2] 徐阳春[1] 常志州[2] 

机构地区：[1]南京农业大学资源与环境科学学院,南京210095 [2]江苏省农业科学院农业资源与环境研究所、农业部江苏耕地保育科学观测实验站,南京210014

出　　处：《生态学杂志》2012年第12期3102-3108,共7页Chinese Journal of Ecology

基　　金：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);IPNI国际合作项目(JIANGSU-11)资助

摘　　要：以12个基因型(品系)甘薯幼苗为材料,NaCl(0和85mmol·L-1)胁迫处理20d,研究了不同基因型甘薯幼苗的生长规律及光合特性。结果表明:盐胁迫抑制甘薯幼苗的生长,"浙紫1号"、"徐薯22"和"徐薯18"受影响较轻,"烟薯25"和"廊薯7-12"受盐害较严重;NaCl处理下,各基因型甘薯幼苗叶片相对含水量(RWC)均维持在75%以上,且品种间差异不大;受盐分影响甘薯幼苗的叶绿素含量指数(CCI)、净光合速率(Pn)、气孔导度(Gs)和瞬时水分利用率(iWUE)表现出不同程度的降低,CCI与Pn表现较好的品种为"浙紫1号"和"徐薯18",但"浙紫1号"Gs受盐分影响较大,盐害指数(SSI)为22%;"烟薯25"对盐分敏感,CCI、Pn及iWUE的SSI指数较低;12个甘薯基因型中,导致"徐薯18"、"川211"和"浙紫1号"光合效率降低的主要因素为气孔限制因素,且NaCl胁迫下光合效率较高;其余9个品种则属非气孔限制因素,但品种间盐敏感程度不同;综合比较各项生理生化指标测定结果,12个基因型甘薯幼苗耐盐性表现较好的品种为"浙紫1号"和"徐薯18"。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 NaC1） for 20 days. As compared with the control, 85 Inmol · L-1 of NaC1 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 P,, but the G~ of ＂Zhezi No. 1＂ was greatly impacted by salt, with the salinity susceptibility index （SSI） being 22%. The ＂Yan shu No. 25＂ was sensitive to NaC1, 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

关 键 词：甘薯 盐胁迫 光合特性 生理响应 

分 类 号：S531[农业科学—作物学]