异源细胞质小麦D2-鉴26的耐盐特征及其遗传基础

以核亲本品种鉴26和耐盐品种科遗26为对照，设计3种NaCl浓度（85.56 mmol/L, 171.04 mmol/L, 256.67 mmol/L）处理及无盐对照，研究了异源细胞质小麦D2-鉴26苗期的生长发育和生理生化特征。结果表明，D2型细胞质对核基因型鉴26存在明显的耐盐性遗传效应，效应值的大小因性状而异，核基因型鉴26与科遗26之间也存在差异；盐胁迫

Genetic Basis and Characterization of Salt Tolerance in Alloplasmic Wheat D2-'Jian 26'

Alloplasmic wheat D2-`Jian 26', euplasmic wheat `Jian 26' and salt-tolerant control cultivar `Keyi 26' were evaluated in developmental and physiological traits at seedling stage under four levels of NaCl (0 mmol/L, 85.56 mmol/L, 171.04 mmol/L, 256.67 mmol/L). Significant genetic effects of D2-type cytoplasm on salt tolerance and genotypic differences in salt tolerance were observed. A clear improvement in terms of the developmental and physiological behaviours of D2-`Jian 26' and `Jian 26' was demonstrated for alloplasmic line D2-`Jian 26'. In view of its better salt-tolerance compared with `Keyi 26' and `Jian 26', D2-`Jian 26' could be used as a new salt-tolerant germplasm. Under the low or medium salt-concentration, more root branching, large S_(K, Na(uptake)) and S_(K, Na(transport)), and good properties of leaf (relatively higher RWC and relatively lower cell-membrane damage and relatively higher chlorophyll content) were the potential usefulness as a salinity stress avoidance mechanism, suggesting that these parameters in stress conditions would be the more reliable selection criteria for salt tolerance in alloplasmic wheat. D2-type cytoplasm would be very useful for wheat breeding of salt tolerance.