摘要
为了解盐胁迫对竹柳(Salix spp.)幼苗生长的影响,采用土培方法,对NaCl胁迫下半年生竹柳扦插苗的成活率、生理响应和根叶部结构进行研究。结果表明,在0.25%Na Cl胁迫(轻度盐胁迫)下竹柳能正常生长,而在>0.5%NaCl(中度、重度盐胁迫)下生长受到抑制,推断竹柳的耐盐阈值是0.5%。随着NaCl浓度的增大,叶片相对含水量、叶绿素a含量、叶绿素总含量和叶绿素a/b均呈下降趋势;但叶绿素b含量、脯氨酸含量和MDA含量呈升高趋势。在轻度盐胁迫下,叶片SOD活性和可溶性蛋白含量均升高,在中、重度盐胁迫下显著下降。从根叶解剖结构来看,叶片、角质层、栅栏组织厚度和根部周皮和直径在轻度盐胁迫时最大,但在中度盐胁迫时叶片栅栏组织细胞长度减小且排列越来越疏松,根部输导组织细胞不正常。这表明竹柳在轻度胁迫时具有一定的耐盐性,但在中高度盐胁迫下生长不良。
In order to understand the effects of NaCl stress on the seedling growth of Salix spp.,the survival rate,physiological response and anatomical structure of half-year-old Salix spp.seedlings were studied under salt stress by pot-culture method.The results showed that the growth of seedlings was well treated with0.25%NaCl(light salt stress),while it was inhibited treated with more than0.5%NaCl(moderate and severe salt stress).It was deduced that the salt tolerant threshold of Salix spp.was0.5%.The relative water content,the content of Chl a,Chl a+b and Chl a/b decreased as salt stress enhanced,while the Chl b,proline and malondialdehyde(MDA)contents increased gradually.The activity of superoxide dismutase(SOD)and soluble protein content increased under light salt stress,but significantly declined under moderate and severe salt stress.The thickness,cuticle,palisade tissue of leaf and the diameter and periderm of root were the biggest treated with0.25%NaCl,while under moderate salt stress,the cell length in palisade tissue of leaf decreased with loose arrangement and the cells in transfusion tissue of root was abnormal.Therefore,it was suggested that Salix spp.had tolerance to light salt stress,and undergrowth at moderate and severe salt stress.
作者
洪文君
申长青
庄雪影
黄久香
HONG Wen-jun;SHEN Chang-qing;ZHUANG Xue-ying;HUANG Jiu-xiang(South China Limestone Plants Research Center, College of Forestry and Landscape Architecture, South China Agricultural University, Guangzhou 510642,China;Sanya Academy of Forestry, Sanya 572023, Hainan, China)
出处
《热带亚热带植物学报》
CAS
CSCD
北大核心
2017年第5期489-496,共8页
Journal of Tropical and Subtropical Botany
基金
华南农业大学与珠海市地方合作项目(4400-H14342)资助~~
关键词
竹柳
盐胁迫
幼苗
生理特性
叶片
根
解剖结构
Salix spp.
Salt stress
Seedling
Physiological characteristic
Leaf
Root
Anatomical structure
