A Strigolactone Biosynthesis Gene Contributed to the Green Revolution in Rice
A Strigolactone Biosynthesis Gene Contributed to the Green Revolution in Rice
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DOI：
10.1016/j.molp.2020.03.009
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发表时间：
2020-06-01
期刊：
影响因子：
27.5
通讯作者：
Qian, Qian
中科院分区：
文献类型：
--
作者：
Wang, Yuexing;Shang, Lianguang;Qian, Qian
植物体型是一种复杂的农艺性状，也是作物产量的主要因素，受多种重要激素的影响。独脚金内酯 (SL) 被认为是许多植物物种中抑制分枝的新型激素，并已被证明参与各种发育过程。 SL 途径的遗传和化学调节被认为是一种有前途的改变植物结构的方法。然而，参与 SL 途径的基因是否以及如何用于育种仍然是个谜。在这里，我们证明了 SL 生物合成基因 HIGH TILLERING AND DWARF 1/DWARF17 (HTD1/D17) 的部分功能丧失等位基因，该基因编码类胡萝卜素裂解双加氧酶 7 (CCD7)，可增加水稻的分蘖数量并提高籽粒产量。我们发现，HTD1 基因已被广泛利用，并与 Semidwarf 1 (SD1) 共同选择，自 20 世纪 60 年代绿色革命以来，两者都有助于改善现代水稻品种的株型。了解植物激素途径基因如何调节植物结构以及它们在育种中如何被利用和选择将为开发提高作物产量的合理方法奠定基础。
Plant architecture is a complex agronomic trait and a major factor of crop yield, which is affected by several important hormones. Strigolactones (SLs) are identified as a new class hormoneinhibiting branching in many plant species and have been shown to be involved in various developmental processes. Genetical and chemical modulation of the SL pathway is recognized as a promising approach to modify plant architecture. However, whether and how the genes involved in the SL pathway could be utilized in breeding still remain elusive. Here, we demonstrate that a partial loss-of-function allele of the SL biosynthesis gene, HIGH TILLERING AND DWARF 1/DWARF17 (HTD1/D17), which encodes CAROTENOID CLEAVAGE DIOXYGENASE 7 (CCD7), increases tiller number and improves grain yield in rice. We found that the HTD1 gene had been widely utilized and co-selected with Semidwarf 1 (SD1), both contributing to the improvement of plant architecture in modern rice varieties since the Green Revolution in the 1960s. Understanding how phytohormone pathway genes regulate plant architecture and how they have been utilized and selected in breeding will lay the foundation for developing the rational approaches toward improving crop yield.