植物营养与肥料学报2013，Vol.19Issue(4)：908-917,10.DOI:10.11674/zwyf.2013.0417
盐胁迫对小型西瓜幼苗体内离子分布的影响
Effect of salinity on distribution of ions in mini-watermelon seedlings
摘要
Abstract
A hydroponic cultivation experiment was carried out with two mini-watermelon cultivars differing in salt tolerance to study the effect of different NaCl concentrations on ions distribution in watermelon seedlings.The results show that NaCl stress inhibits the growth of watermelon seedlings,and the extent of inhibition for ‘ Xiuya' is less than that of ‘ Xiuli'.Increasing NaCl concentration,the Na + and Cl-contents of the seedlings are increased,while the K +,Ca2+ and Mg2+ contents decreased.The five ions present a compartmentalized distribution.Cl-mainly accumulates in the stems and Na + mainly concentrates in roots and stems.The decreased range of the K +contents is larger in stems and smaller in leaves,Ca2+ and Mg2+ mainly exist in stems and leaves and the declined extent in leaves is less.The abilities of selective transportation of K + and Ca2+ from roots to stems are decreased,while the abilities from stems to leaves are increased under the NaCl stress,which contributes to alleviate the damage of NaCl stress to leaves.Compared to cv.‘ Xiuli',the K + and Ca2 + contents in leaves of cv.‘ Xiuya'reduced less,Cl-and Na+ accumulations are less.As a consequence,K+/Na+ and Ca2+/Na+ radios are higher,and SK,Na and Sca,Naratios of selective transportations from stems to leaves are also higher.This research reveals that lower selective transportation of Na + to leaves is one of main reasons for cv.‘ Xiuya' with more salt-tolerance,and the compartmentalized distribution of ions on the organs is one of physiological adaptation mechanisms of watermelon plants to salinity.关键词
小型西瓜/盐胁迫/离子分布/选择性运输Key words
mini-watermelon/ salinity/ ions distribution/ selective transportation分类
农业科技引用本文复制引用
韩志平,郭世荣,郑瑞娜,束胜,闫海霞..盐胁迫对小型西瓜幼苗体内离子分布的影响[J].植物营养与肥料学报,2013,19(4):908-917,10.基金项目
国家重点基础研究发展计划(2009CB119000) （2009CB119000）
现代农业产业技术体系建设专项资金(CARS-25-C-03) （CARS-25-C-03）
江苏省农业三新工程项目(SX[2011]289,SXGC[2012]391)资助. （SX[2011]289,SXGC[2012]391）
