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首页> 外文期刊>Plant and Soil >Genotypic variation in root growth angle in rice (Oryza sativa L.) and its association with deep root development in upland fields with different water regimes.
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Genotypic variation in root growth angle in rice (Oryza sativa L.) and its association with deep root development in upland fields with different water regimes.

机译：水稻（Oryza sativa L.）根系生长角度的基因型变化及其与不同水分状况下旱田根深发育的关系。

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摘要

Deep root development, which is important for the drought resistance in rice (Oryza sativa L.), is a complex trait combining various root morphologies. The objective of this study was to elucidate genotypic variation in deep root development in relation to morphological indicators such as vertical root distribution and root growth angle. Two experiments were conducted: one on upland fields, and one in pots and fields. In experiment 1, the root systems of six rice cultivars on upland fields were physio-morphologically analyzed under different water regimes (irrigated and intermittent drought conditions during panicle development). In experiment 2, cultivar differences in root growth angles were evaluated with 12 cultivars using the basket method under irrigated conditions. No cultivar x environment interactions were found for total root length or deep root length between irrigated and drought conditions in experiment 1. This suggests that constitutive root growth, which is genetically determined, is important for deep root development under intermittent drought conditions during reproductive stage. Among root traits, the deep root ratio (i.e., deep root weight divided by total root weight) was most closely related to deep root length under both water regimes. This suggested that vertical root distribution constitutively affects deep root length. Significant genotypic variation existed in the nodal root diameter and root growth angle of upland rice in experiment 2. It was considered that genotypes with thick roots allocated more assimilates to deep roots through root growth angles higher to the horizontal plane on upland fields. This is the first report on genotypic variation in the root growth angle of rice on upland fields. It should prove useful for rough estimations of genotypic variation in the vertical root distribution of upland rice because root growth angle is rapidly and easily measured..
机译：深根发育对水稻（Oryza sativa L.）的抗旱性很重要，它是一种综合了多种根系形态的复杂性状。本研究的目的是阐明与根系垂直分布和根系生长角度等形态指标相关的深根发育中的基因型变异。进行了两个实验：一个在陆地上，另一个在盆地上。在实验1中，在不同的水分状况下（穗发育过程中的灌溉和间歇干旱条件下），对6个水稻品种在旱地的根系进行了生理形态学分析。在实验2中，在灌溉条件下，使用篮子法用12个品种评估了根系生长角度的品种差异。在实验1中，未发现灌溉条件和干旱条件之间的总根长或深根长度之间有品种x环境的相互作用。这表明遗传确定的组成型根系生长对于生殖阶段间歇干旱条件下的深根发育很重要。在两种水分制度下，根系性状中的深根比（即深根重除以总根重）与根深最密切相关。这表明垂直的根部分布对深根长度有构成性影响。在实验2中，旱稻的节根直径和根的生长角度存在明显的基因型变异。据认为，根部较厚的基因型通过更高的根向水陆方向的根生长角度与深根同化。这是关于旱地水稻根系生长角度基因型变异的第一份报道。由于可以快速，轻松地测量根系生长角度，因此对于粗略估测稻田垂直根系分布的基因型变异很有用。

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