Increased copy number of Gibberelin 2-oxidase 8 genes reduced trailing growth and shoot length during soybean domestication

Reference Report for AP20210712.1

Title:	Increased copy number of Gibberelin 2-oxidase 8 genes reduced trailing growth and shoot length during soybean domestication
Authors:	Wang, X., Li, M., Wong, F., Chung, C. Y., Yung, W., Wang, Z., Xie, M., Song, S., Chung, G., Chan, T., Lam, H.
Source:	Wang et al. 2021 The Plant Journal(2021)107,17391755
Abstract:	Copy number variations (CNVs) play important roles in crop domestication. However, there is only very limited information on the involvement of CNVs in soybean domestication. Trailing growth and long shoots are soybean adaptations for natural habitats but cause lodging that hampers yield in cultivation. Previous studies have focused onDt1/2that affect the indeterminate/determinate growth habit while the possible role of the gibberellin (GA) pathway remained unclear. Here, the quantitative trait locus (QTL) mapping of a recombinant inbred population of 460 lines revealed a trailing-growth-and-shoot-length QTL. A copy number variation (CNV) region within this QTL was identified, featuring the apical bud-expressedgibberellin 2-oxidase 8A/B, the copy numbers of which were positively correlated with expression levels and negatively with trailing growth and shoot length, and their effects were demonstrated by transgenic soybean andArabidopsis thaliana. Based on the fixation index, this CNV region underwent intense selection during the initial domestication process.

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