Zhang Jianping, Qi Yanni, Wang Limin, Wang Lili, Yan Xingchu, Dang Zhao, Li Wenjuan, Zhao Wei, Pei Xinwu, Li Xuming, Liu Min, Tan Meilian, Wang Lei, Long Yan, Wang Jing, Zhang Xuewen, Dang Zhanhai, Zheng Hongkun, Liu Touming
Institute of Crop Research, Gansu Academy of Agricultural Sciences, Lanzhou, Gansu, China.
Institute of Crop Research, Gansu Academy of Agricultural Sciences, Lanzhou, Gansu, China.
iScience. 2020 Apr 24;23(4):100967. doi: 10.1016/j.isci.2020.100967. Epub 2020 Mar 6.
Flax has been cultivated for its oil and fiber for thousands of years. However, it remains unclear how the modifications of agronomic traits occurred on the genetic level during flax cultivation. In this study, we conducted genome-wide variation analyses on multiple accessions of oil-use, fiber-use, landraces, and pale flax to identify the genomic variations during flax cultivation. Our findings indicate that, during flax domestication, genes relevant to flowering, dehiscence, oil production, and plant architecture were preferentially selected. Furthermore, regardless of origins, the improvement of the modern oil-use flax preceded that of the fiber-use flax, although the dual selection on oil-use and fiber-use characteristics might have occurred in the early flax domestication. We also found that the expansion of MYB46/MYB83 genes may have contributed to the unique secondary cell wall biosynthesis in flax and the directional selections on MYB46/MYB83 may have shaped the morphological profile of the current oil-use and fiber-use flax.
亚麻因其油和纤维被种植了数千年。然而，尚不清楚在亚麻种植过程中，农艺性状的改变在基因层面是如何发生的。在本研究中，我们对多个油用、纤维用、地方品种和野生亚麻种质进行了全基因组变异分析，以确定亚麻种植过程中的基因组变异。我们的研究结果表明，在亚麻驯化过程中，与开花、裂果、油脂合成和株型相关的基因被优先选择。此外，无论起源如何，现代油用亚麻的改良先于纤维用亚麻，尽管在亚麻驯化早期可能同时对油用和纤维用特性进行了选择。我们还发现，MYB46/MYB83基因的扩增可能有助于亚麻独特的次生细胞壁生物合成，对MYB46/MYB83的定向选择可能塑造了当前油用和纤维用亚麻的形态特征。
