The effect of impedance to root growth on plant architecture in wheat.
The effect of impedance to root growth on plant architecture in wheat.
复制标题
根系生长阻抗对小麦株型的影响
DOI：
10.1007/s11104-015-2462-0
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发表时间：
2015
期刊：
影响因子：
4.9
通讯作者：
Whalley WR
中科院分区：
文献类型：
--
作者：
Jin K;Shen J;Ashton RW;White RP;Dodd IC;Phillips AL;Parry MA;Whalley WR
我们对根系生长阻抗对小麦根、梢结构的影响感兴趣。已知Rht-1半矮化等位基因由于根系阻抗降低了叶片发育迟缓的程度。我们比较了含有不同Rht-1等位基因的商品小麦品种，以确定根系阻抗引起的叶片发育迟缓在不同品种之间是否存在差异。研究了根系生长阻抗对根系角展的影响。小麦品种Avalon、Robigus和Battalion携带Rht-1和cv -1的半矮化等位基因。携带高的野生型等位基因的Cadenza在两种土壤强度下的沙培养系统中生长，该系统旨在允许根系生长环境的机械阻抗独立于水分和养分的可用性进行调节。受阻碍的根比无阻碍的根生长更陡峭，根的角展布从垂直55°下降到43°，但基因型效应较弱。根阻抗降低了叶片伸长和分蘖数。叶面积和总根长在所有基因型x处理组合中具有共同的关系。华彩区叶片发育迟缓更为严重。我们的数据支持了由根阻抗引起的叶片发育迟缓的严重程度与Rht等位基因有关的假设。受阻根有较小的角展开。
We were interested in the effect of impedance to root growth on root and shoot architecture of wheat. It is known that Rht-1 semi-dwarfing alleles decrease the degree of leaf stunting due to root impedance. We compared commercial wheat cultivars containing different Rht-1 alleles to determine whether leaf stunting caused by root impedance differed between cultivars. We investigated effects of impedance to root growth on the angular spread of roots. The wheat cultivars Avalon, Robigus and Battalion, carrying semi-dwarfing alleles of Rht-1, and cv. Cadenza, carrying the tall, wild-type allele, were grown under two levels of soil strength in a sand culture system designed to allow the mechanical impedance of the root growth environment to be adjusted independently of water and nutrient availability. Impeded roots grew more steeply than non-impeded roots: the angular spread of roots decreased from 55° to 43° from the vertical, but the genotypic effects were weak. Root impedance reduced leaf elongation and the number of tillers. Leaf area and total root length provided a common relationship across all genotype x treatment combinations. Leaf stunting in Cadenza was more severe. Our data support the hypothesis that the severity of leaf stunting due to root impedance is related to the Rht allele. Impeded roots had a smaller angular spread.