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Maternal Control Of Seed Weight I.n Rapeseed (Brassica Napus L .): The Causal Link Between The Size Of Pod (Mother, Source) And Seed (Offspring, Sink)

文献类型： 外文期刊

作者： Li, N; Song, OJ; Peng, W; Zhan, JP; Shi, JQ; Wang, XF; Liu, GH; Wang, HZ

作者机构：

关键词： Brassica napus; maternal effect; photosynthesis; pod length; quantitative trait locus; RNA-seq; seed weight; sink; source

期刊名称： PLANT BIOTECHNOLOGY JOURNAL

ISSN： 1467-7644

年卷期： 2019 年 17 卷 4 期

页码：

收录情况： JCR（2021版）

摘要： Seed size/weight is one of the key traits related to plant domestication and crop improvement. In rapeseed (Brassica napus L.) germplasm, seed weight shows extensive variation, but its regulatory mechanism is poorly understood. To identify the key mechanism of seed weight regulation, a systematic comparative study was performed. Genetic, morphological and cytological evidence showed that seed weight was controlled by maternal genotype, through the regulation of seed size mainly via cell number. The physiological evidence indicated that differences in the pod length might result in differences in pod wall photosynthetic area, carbohydrates and the final seed weight. We also identified two pleiotropic major quantitative trait loci that acted indirectly on seed weight via their effects on pod length. RNA-seq results showed that genes related to pod development and hormones were significantly differentially expressed in the pod wall; genes related to development, cell division, nutrient reservoir and ribosomal proteins were all up-regulated in the seeds of the large-seed pool. Finally, we proposed a potential seed weight regulatory mechanism that is specific to rapeseed and novel in plants. The results demonstrate a causal link between the size of the pod (mother, source) and the seed (offspring, sink) in rapeseed, which provides novel insight into the maternal control of seed weight and will open a new research field in plants.

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