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首页> 美国卫生研究院文献>Journal of Experimental Botany >Developmental and growth controls of tillering and water-soluble carbohydrate accumulation in contrasting wheat (Triticum aestivum L.) genotypes: can we dissect them?
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Developmental and growth controls of tillering and water-soluble carbohydrate accumulation in contrasting wheat (Triticum aestivum L.) genotypes: can we dissect them?

机译：在不同基因型小麦（Triticum aestivum L.）上分and和水溶性碳水化合物积累的发育和生长控制：我们可以解剖它们吗？

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摘要

In wheat, tillering and water-soluble carbohydrates (WSCs) in the stem are potential traits for adaptation to different environments and are of interest as targets for selective breeding. This study investigated the observation that a high stem WSC concentration (WSCc) is often related to low tillering. The proposition tested was that stem WSC accumulation is plant density dependent and could be an emergent property of tillering, whether driven by genotype or by environment. A small subset of recombinant inbred lines (RILs) contrasting for tillering was grown at different plant densities or on different sowing dates in multiple field experiments. Both tillering and WSCc were highly influenced by the environment, with a smaller, distinct genotypic component; the genotype×environment range covered 350–750 stems m–2 and 25–210mg g–1 WSCc. Stem WSCc was inversely related to stem number m–2, but genotypic rankings for stem WSCc persisted when RILs were compared at similar stem density. Low tillering–high WSCc RILs had similar leaf area index, larger individual leaves, and stems with larger internode cross-section and wall area when compared with high tillering–low WSCc RILs. The maximum number of stems per plant was positively associated with growth and relative growth rate per plant, tillering rate and duration, and also, in some treatments, with leaf appearance rate and final leaf number. A common threshold of the red:far red ratio (0.39–0.44; standard error of the difference=0.055) coincided with the maximum stem number per plant across genotypes and plant densities, and could be effectively used in crop simulation modelling as a ‘cut-off’ rule for tillering. The relationship between tillering, WSCc, and their component traits, as well as the possible implications for crop simulation and breeding, is discussed.
机译：在小麦中，茎中的分till和水溶性碳水化合物（WSC）是适应不同环境的潜在性状，并且作为选择性育种的目标受到关注。这项研究调查了观察结果，即高茎WSC浓度（WSCc）通常与低分till有关。测试的命题是茎WSC的积累取决于植物的密度，并且可能是分ing的一种新兴特性，无论是受基因型还是受环境驱动。在多田间试验中，一小部分的用于分till的重组自交系（RIL）在不同的植物密度或不同的播种日期生长。分till和WSCc都受到环境的影响，具有较小的，独特的基因型成分。基因型×环境范围覆盖了350–750个茎m –2 和25–210mg g –1 WSCc。茎WSCc与茎数m –2 成反比，但是当在相似茎密度下比较RIL时，茎WSCc的基因型排名仍然存在。与高分-低WSCc RILs相比，低分-高WSCc RILs具有相似的叶面积指数，较大的单叶，茎间节横截面和壁面积更大。每株植物的最大茎数与每株植物的生长和相对生长率，分till率和持续时间呈正相关，在某些处理中，还与叶出现率和最终叶数成正比。红色：远红色比率的共同阈值（0.39–0.44；标准差的差异= 0.055）与基因型和植物密度上每株植物的最大茎数相吻合，可以有效地用于作物模拟建模中。 -分'规则。讨论了分ing，WSCc及其组成特征之间的关系，以及对作物模拟和育种的潜在影响。

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