Haaning Allison M, Smith Kevin P, Brown-Guedira Gina L, Chao Shiaoman, Tyagi Priyanka, Muehlbauer Gary J
Department of Plant and Microbial Biology, University of Minnesota, Saint Paul, Minnesota.
Department of Agronomy and Plant Genetics, University of Minnesota, Saint Paul, Minnesota.
G3 (Bethesda). 2020 Apr 9;10(4):1197-1212. doi: 10.1534/g3.119.400612.
In barley ( L.), lateral branches called tillers contribute to grain yield and define shoot architecture, but genetic control of tiller number and developmental rate are not well characterized. The primary objectives of this work were to examine relationships between tiller number and other agronomic and morphological traits and identify natural genetic variation associated with tiller number and rate, and related traits. We grew 768 lines from the USDA National Small Grain Collection in the field and collected data over two years for tiller number and rate, and agronomic and morphological traits. Our results confirmed that spike row-type and days to heading are correlated with tiller number, and as much as 28% of tiller number variance was associated with these traits. In addition, negative correlations between tiller number and leaf width and stem diameter were observed, indicating trade-offs between tiller development and other vegetative growth. Thirty-three quantitative trait loci (QTL) were associated with tiller number or rate. Of these, 40% overlapped QTL associated with days to heading and 22% overlapped QTL associated with spike row-type, further supporting that tiller development is associated with these traits. Some QTL associated with tiller number or rate, including the major QTL on chromosome 3H, were not associated with other traits, suggesting that some QTL may be directly related to rate of tiller development or axillary bud number. These results enhance our knowledge of the genetic control of tiller development in barley, which is important for optimizing tiller number and rate for yield improvement.
在大麦（L.）中，被称为分蘖的侧枝对籽粒产量有贡献并决定茎秆结构，但分蘖数和发育速率的遗传控制尚未得到很好的表征。这项工作的主要目标是研究分蘖数与其他农艺和形态性状之间的关系，并鉴定与分蘖数、速率及相关性状相关的自然遗传变异。我们在田间种植了来自美国农业部国家小粒谷物收集库的768个品系，并在两年时间里收集了分蘖数、速率以及农艺和形态性状的数据。我们的结果证实，穗行数和抽穗天数与分蘖数相关，高达28%的分蘖数变异与这些性状有关。此外，观察到分蘖数与叶宽和茎直径之间呈负相关，表明分蘖发育与其他营养生长之间存在权衡。33个数量性状位点（QTL）与分蘖数或速率相关。其中，40%与抽穗天数相关的QTL重叠，22%与穗行数相关的QTL重叠，进一步支持分蘖发育与这些性状有关。一些与分蘖数或速率相关的QTL，包括位于3H染色体上的主效QTL，与其他性状无关，这表明一些QTL可能与分蘖发育速率或腋芽数直接相关。这些结果增进了我们对大麦分蘖发育遗传控制的了解，这对于优化分蘖数和速率以提高产量很重要。
