外源氯对甘薯幼苗生长及养分吸收的影响  

Seedling growth and nutrient absorption of sweet potato affected by exogenous chlorine

作　　者：戚冰洁[1,2] 曹月阳[1,2] 张珮琪[3] 汪吉东[1] 张永春[1] 徐阳春[2] 

机构地区：[1]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,江苏南京210014 [2]南京农业大学资源与环境科学学院,江苏南京210095 [3]中国农业大学农学与生物技术学院,北京100193

出　　处：《江苏农业学报》2014年第1期80-86,共7页Jiangsu Journal of Agricultural Sciences

基　　金：公益性行业农业专项基金项目(200903001);现代农业产业技术体系建设专项基金项目(CARS-11-B-15);江苏省农业科技自主创新基金项目[CX(12)3037];IPNI国际合作项目(JIANGSU-11)

摘　　要：为研究外源氯对甘薯幼苗生长及养分吸收的影响,以徐薯22、苏薯11和宁紫1号为材料,外源氯（0mmol/L、42.2 mmol/L、84.4 mmol/L、168.8 mmol/L、211.0 mmol/L）处理7d和21 d,测定植株鲜质量、叶绿素含量指数（CCI）、丙二醛（M DA）含量、硝酸还原酶（NR）活性、硝酸盐（NO3）含量、氮（N）、磷（P）、钾（K）含量及其累积值.结果表明：徐薯22生物量和N、P、K累积值随Cl-浓度升高而降低但维持在一定水平,低浓度氯（Cl-浓度≤84.4 mmol/L）处理促进苏薯11和宁紫1号生长.42.2 ～ 168.8 mmol/L外源氯处理促进甘薯叶绿素合成,而MDA含量在外源氯处理下逐渐升高.低浓度外源氯（C1-浓度≤84.4 mmol/L）处理21 d可提高甘薯幼苗NR活性和NO3含量,从而提高总N含量.可见,不同品种甘薯耐氯性不同,但短期内低浓度外源氯处理有利于甘薯幼苗的生长.Taking the seedlings of sweet potatoes Xushu22, Sushu11 and Ningzi1 as test materials, their nutrient ab-sorption and plant growth under exogenous chlorine treatments （0 mmol/ L, 42.2 mmol/ L, 84.4 mmol/ L, 168.8 mmol/ L,211.0 mmol/ L） for 7 d and 21 d were investigated, by measuring plant fresh weight, chlorophyll content index （CCI）, ma-londialdehyde （MDA） content, nitrate reductase （NR） activity, NO-3 content, and contents and accumulations of N, P andK. The results showed that the biomass and NPK-accumulations of Xushu22 declined by exogenous chlorine, however, theywere maintained at certain levels. Lower concentrations of chlorine treatment（≤84.4 mmol/ L） improved the growths of Sus-hu11 and Ningzi1. The CCI of 3 genotypes of sweet potato increased by exogenous chlorine with concentrations ranging from 42.2 to 168.8 mmol/ L compared to the control. MDA levels were improved by chlorine. Twenty-one days of lower concentra-tions （≤84.4 mmol/ L） of chlorine increased total nitrogencontent by increasing NR activity and NO-3 content of sweetpotato seedlings. These results indicate that chloride stresstolerance is genotype-dependent in sweet potato, and short-term and low-concentration exogenous chloride treatment isconducive to the growth of sweet potato seedlings.

关 键 词：甘薯 外源氯 丙二醛 养分吸收 

分 类 号：Q945.78[生物学—植物学]