小麦地上部和根系生长的相关性及其在耐Al性筛选中的作用

1　引　　言以往的研究中 ,测定植物根系长度或重量通常以相对根长或相对根系干重作为耐性指标进行耐Ａｌ性的筛选2 ,4 ,5,8] .但是根系性状在土培或田间试验中不仅取样和测定困难 ,而且易造成根系损伤 ,影响测定的精度 .因此 ,有必要建立简便、可靠且易于测定的筛选指标 .能否采用植株地上部耐性指标来衡量不同小麦基因型的耐Ａｌ性 ?以往涉及植物在铝毒胁迫下地上部和根系生长的耐性指标间的相关性 ,以及地上部耐性指标用于耐Ａｌ性筛选方面的研究甚少 .本研究采用两种筛选方法探讨了 2 4个小麦基因型地上部和根系耐性指标间的相关性 ,旨…

Correlations of shoot and root growth and its role in screening for aluminum tolerance in wheat

A large-volume solution culture and a small-pot soil test were adopted to screen for aluminum tolerance in wheat. Significant correlations were observed between root and shoot tolerance indices in wheat genotypes by using the same or different screening method. It was also shown that root tolerance parameters such as relative root length (RRL) and relative root dry weight (RRW) had more sensitive for differentiating aluminum tolerance in wheat genotypes indicated by higher standard deviation (SD),coefficient of variation (CV),and distrbution of data. Although shoot tolerance parameters,such as relative shoot length (RSL) and relative shoot dry weight (RSW) had less sensitive for differentiating aluminum tolerance within wheat genotypes indicated by lower SD,CV,and distribution of data,shoot growth parameters were reliable indicators of Al tolerance because they were sufficient to discriminate Al-tolerant and Al-sensitive genotypes in wheat. Shoot growth especially shoot length could be easily,rapidly,and non-destructively determined,and used effectively to screen for aluminum tolerance in a large-scale screening or breeding program.