盐胁迫下棉花体内Na^+的积累、分配及耐盐机制研究  

Characteristics of Absorbing,Accumulating and Distribution of Na^+ under the Salinity Stress on Cotton

作　　者：叶武威[1] 庞念厂[1] 王俊娟[1] 樊宝相[1] 

机构地区：[1]中国农业科学院棉花研究所,河南安阳455000

出　　处：《棉花学报》2006年第5期279-283,共5页Cotton Science

基　　金：国家"十五"科技攻关项目(2004BA525B05)

摘　　要：NaCl胁迫下,棉花体内以阳离子Na+为主要毒害因子,耐盐性不同的棉花根、茎、叶内Na+积累量存在显著差异,Na+含量吸收和累积最多的部位是:不耐盐材料的根、耐盐材料的根和叶、强耐盐的叶。不同耐盐性的材料从外界吸收的Na+总量就全植株来讲大致相同,只是在体内各器官的分布存在差异;低浓度NaCl(0.2%)下,不耐盐、耐盐材料的全植株Na+量分别上升1.9倍和2.9倍;高浓度NaCl(0.4%)下,不耐盐、耐盐、强耐盐材料分别比对照上升3.6倍、5.2倍和5.3倍。尽管棉花萌发阶段几乎不吸盐,但成株期是吸盐的,且吸盐量提高很多倍,这说明棉花对盐分的吸收具有发育阶段性,同时也反映出棉花耐盐的阶段性。总之认为棉花的耐盐机理与小麦、大麦等作物不同,具特殊性。Under the stress of NaCl, the main active infector is the cation（Na^＋）. Na＋ is absorbed and accumulated distinctively among the different organs such as root, stem, leaf within the various salini- ty-resisted genotypes of cotton. It is the root of salinity-sensitive genotype, the root and leaf of salini-ty-resisted genotype, or the leaf of the salinity-high-resisted genotype whose Na^＋ is absorbed and accumulated most highly. But Na^＋ absorbed by the whole frond is almost the same according to the stress environment, while there is different among the different organs. Under the stress of lower concentration of NaCI（0. 2%）, Na^＋ absorbed in the salinity-sensitive genotype and the resisted or high-resisted genotype was 1. 9 times and 2. 9 times of the control, respectively; while under the stress of higher concentration of NaCI（0.4%）, Na^＋ absorbed in the salinity-sensitive genotype, in the resisted and in high-resisted genotype is 3.6 times, 5.2 times and 5.3 times of the control, respective- ly. Cotton is salinity-escaping-type in the germination period while salinity-high-absorbing-type in the later growth periods, which suggests the resisted mechanism is staggered and in phases. Overall, the salinity-resisted mechanism of cotton is different from other crops such as wheat and barley.

关 键 词：棉花 盐胁迫 NA^+ 耐盐性 NACL 耐盐机制 

分 类 号：S562[农业科学—作物学]