铝胁迫对不同耐铝大麦基因型干物质积累与铝和养分含量的影响

Effect of Al on dry matter accumulation and Al and nutrition contents of barleys differing in Al tolerance

以苗期表现为耐铝性具有明显差异的 10份大麦基因型为材料 (耐铝和铝敏感基因型各 5个 ) ,研究铝胁迫条件下生育后期植株生物量、铝和养分元素含量的差异。结果表明 ,铝胁迫抑制植株干物质积累 ,但抑制程度因基因型而异 ,上 70 119等铝敏感基因型受影响较大 ,且两类基因型之间的差异成熟期明显大于乳熟期。铝胁迫显著降低敏感基因型的子粒产量 ,但对耐性基因型的影响较小。铝胁迫增加所有基因型根系和地上部的Al含量 ,但增加幅度基因型之间存在着明显差异 ,耐铝基因型增加较少 ,而铝敏感基因型表现显著增加。酸性土壤上 ,根系和地上部N、P、K、Ca、Mg和Zn等养分含量 ,铝敏感基因型显著减少 ,耐铝基因型受影响较小。

The experiment was conducted by using 10 barley genotypes with different Al-tolerance at seedling stages, each 5 genotypes for Al-tolerance and Al-sensitivity, to determine the difference in biomass accumulation, Al and nutrient content in the roots and shoots among genotypes under the condition of Al stress. The results showed that Al stress reduced dry matter accumulation of all genotypes, the extent of reduction varied with genotypes, being much more affected for the Al-sensitive genotypes, such as Shang 70-119 than the Al-tolerant genotypes, in comparison with the control. The difference between two kinds of genotypes in biomass inhibition was much larger at maturity than at milking stage. Al stress significantly reduced grain yield of Al-sensitive genotypes, but had less effect on Al-tolerant genotypes. Al contents both in root and shoot increased under Al stress condition in all genotypes, while the difference existed in the increased Al content between two kinds of genotypes, being much higher in Al-sensitive genotypes than in Al-tolerant ones. Al stress dramatically reduced the N、P、K、Ca、Mg and Zn contents in the roots and shoots of Al-sensitive genotypes, but had little influence on Al-tolerant genotypes in these nutrient contents.