红麻杂交种的根系生长对盐胁迫的抗性优势表现  

Superiority of resistance in the root growth of kenaf hybrid under salt stress

作　　者：张加强[1] 潘凤英[1] 窦俊焕[1] 陈鹏[1] 周琼[1] 周瑞阳[1] 

机构地区：[1]广西大学农学院,南宁530004

出　　处：《中国农业大学学报》2011年第5期6-12,共7页Journal of China Agricultural University

基　　金：国家麻类产业技术体系建设专项(nycytx-19-E16);广西研究生教育创新计划项目(105931001010)

摘　　要：以红麻细胞质雄性不育系P3A、恢复系992及其杂交种为材料,采用水培法研究了红麻杂交种根系生长对盐胁迫的抗性优势表现。揭示不同程度盐胁迫对红麻杂交种根系生长的影响,以期为红麻杂种优势利用及耐盐红麻杂交种的培育提供理论参考。结果表明:在盐胁迫下,不同基因型对盐胁迫的耐性存在明显差异;红麻杂交种幼苗的根长、根表面积、根体积和根尖数等均优于亲本,存在明显的杂种优势,表现出较强的中亲优势和超高亲优势;随着盐浓度的提高,杂交种与亲本间差异达到显著水平。说明在一定阈值内,红麻杂交种根系生长在盐胁迫下明显表现出比亲本较强的耐性,红麻杂交种在耐盐性方面具有杂种优势。同时盐胁迫改变了红麻根系的形态构型,使根系趋于简单化,可以有效增加根系生长形成更多的粗根,提高其耐盐能力。研究结果为通过杂交育种获得更加耐盐的红麻材料提供了依据。The heterosis of salt tolerance for kenaf hybrid was studied through hydroponic methods, with cytoplasmic male sterility （CMS） kenaf P3A, maintainer line P3B and hybrid as experimental materials. The objective of this study was to investigate the heterosis of kenaf root growth at seedling stage under salt stress, thus provide a scientific basis for kenaf heterosis utilization and kenaf hybrid breeding for salt-tolerance. The results showed that salt stress significantly inhibited the root growth of kenaf. They were different among different genotypes. The heterosis existed in the root length, root surface area, root volume and root tips under salt stress, and the hybrid with advantages over the parents. The F~ hybrid of kenaf showed both strong midparent and overparent heterosis. The finding suggested that the F1 hybrid possessed higher salt tolerance than that of the parents within certain range. The root architecture of kenaf were altered under salt stress, and more coarse root （root diameter〉2.25 mm were formed. This suggested that salt stress promoted the superiority of resistance. Under salt stress condition, kenaf hybrid develop more coarse root （root diameter〉2.25 mm） than that of its parents,which enable them to resist moderate salt better.

关 键 词：红麻 盐胁迫 杂交种 根系 

分 类 号：S563.5[农业科学—作物学] Q321.6[生物学—遗传学]