USDA Tree Fruit Research Laboratory, 1104 N Western Avenue, Wenatchee, WA, USA.
United States Department of Agriculture (USDA) Appalachian Fruit Research Station, 2217 Wiltshire Road, Kearneysville, WV, USA.
Curr Opin Plant Biol. 2021 Feb;59:101983. doi: 10.1016/j.pbi.2020.101983. Epub 2021 Jan 7.
Genetic improvement of architectural traits offers tremendous opportunities to dramatically improve crop densities, productivity, and ultimately sustainability. Among these, the orientation, or gravitropic set point angle (GSA), of plant organs is critical to optimize crop profiles, light capture, and nutrient acquisition. Mutant GSA phenotypes have been studied in plants since the 1930's but only recently have the underlying genes been identified. Many of these genes have turned out to fall within the IGT (LAZY1/DRO1/TAC1) family, which initially was not previously recognized due to the lack of sequence conservation of homologous genes across species. Here we discuss recent progress on IGT family genes in various plant species over the past century, review possible functional mechanisms, and provide further analysis of their evolution in land plants and their past and future roles in crop domestication.
遗传改良结构性状为大幅提高作物密度、生产力并最终提高可持续性提供了巨大的机会。在这些性状中，植物器官的方向或向重性设定点角度（GSA）对于优化作物形态、捕获光线和获取养分至关重要。自 20 世纪 30 年代以来，人们一直在研究植物的突变 GSA 表型，但直到最近才确定了潜在的基因。这些基因中的许多都属于 IGT（LAZY1/DRO1/TAC1）家族，最初由于缺乏跨物种同源基因的序列保守性，这些基因并未被识别。在这里，我们将讨论过去一个世纪中不同植物物种中 IGT 家族基因的最新进展，回顾可能的功能机制，并进一步分析它们在陆地植物中的进化及其在作物驯化中的过去和未来作用。
