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The genomic and transcriptomic foundations of viviparous seed development in mangroves
bioRxiv - Genomics Pub Date : 2020-10-20 , DOI: 10.1101/2020.10.19.346163
Hongmei Qiao , Xiaoxuan Zhou , Wenyue Su , Xing Zhao , Pengfei Jin , Shanshan He , Wei Hu , Meiping Fu , Dingtian Yu , Saiqi Hao , Yuan-Ye Zhang , Wenqing Wang , Congting Ye , Qingshun Quinn Li , Yingjia Shen

Vivipary in plants refers to a specific seed development and reproductive strategy where seeds minimize the dormancy stage and germinate while still attached to their maternal plants. It is one of the most unique adaptive genetic features used by many mangrove species where elongated hypocotyls aid in quick root emergence to anchor the seedling in coastal intertidal wetlands. The genetic mechanisms behind mangrove vivipary, however, remain elusive. Using comparative genomic and transcriptomic technologies to investigate viviparous mangroves and their close inland relatives, we found that a full array of gene expression profiles were altered, including key plant hormone metabolic pathways, high expression of embryonic signature genes, and reduced production of proanthocyanidins and storage proteins. Along with these changes, a major gene regulating seed dormancy, Delay of Germination-1 (DOG1), is entirely missing or defunct within the entire linage of the four genera with true viviparous characteristics. These results suggest a systemic level change is required to warrant the genetic program of mangrove vivipary. Understanding of the molecular processes of vivipary could benefit the design of pregerminated propagules for forestation in harsh environments or prevent precocious germination of grain crops pre- and post-harvest.

中文翻译:

红树林胎生种子发育的基因组和转录组基础

植物中的v虫是指特定的种子发育和繁殖策略,其中种子最小化休眠阶段并发芽,同时仍附着在其母本植物上。它是许多红树林物种使用的最独特的适应性遗传特征之一,其中伸长的下胚轴有助于快速生根,从而将幼苗固定在沿海潮间带湿地中。然而,红树林鸟类的遗传机制仍然难以捉摸。使用比较基因组学和转录组学技术研究胎生红树林及其近缘内陆物种,我们发现一系列基因表达谱发生了改变,包括关键的植物激素代谢途径,胚胎签名基因的高表达以及原花色素的产生和储存的减少蛋白质。随着这些变化,调控种子休眠的主要基因,发芽延迟1(DOG1),在具有真正胎生特征的四个属的整个谱系中完全缺失或消失。这些结果表明,需要进行系统的水平变化以保证红树林viv虫的遗传程序。了解食虫分子的过程可能有益于在恶劣环境中造林的预发芽繁殖体的设计,或防止收获前和收获后谷物作物的早熟发芽。
更新日期:2020-10-20
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