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Plant Communications:全基因组复制恢复杂种猴面花的不育表型

已有 442 次阅读 2020-7-11 08:53 |个人分类:每日摘要|系统分类:论文交流

Effect of whole-genome duplication on the evolutionary rescue of sterile hybrid monkeyflowers

第一作者Sofie Meeus

第一单位英国斯特林大学

通讯作者Mario Vallejo-Marín


 Abstract 


背景回顾:Hybridisation is a creative evolutionary force, increasing genomic diversity, and facilitating adaptation and even speciation. Hybrids often face significant challenges to become established, including reduced fertility arising from genomic incompatibilities between their parents. Whole genome duplication in hybrids (allopolyploidy) can restore fertility, cause immediate phenotypic changes, and generate reproductive isolation.


提出问题:Yet the survival of polyploid lineages is uncertain, and few studies have compared the performance of recently formed allopolyploids and their parents under field conditions.


主要研究:Here we use natural and synthetically-produced hybrid and polyploid monkeyflowers (Mimulus spp.) to study how polyploidy contributes to the fertility, reproductive isolation, phenotype and performance of hybrids in the field. 


结果1-育性:We find that polyploidisation restores fertility and that allopolyploids are reproductively isolated from their parents.


结果2-表型The phenotype of allopolyploids displays the classic gigas effect of whole genome duplication, producing plants with larger organs and slower flowering.


结果3-存活表现Field experiments indicate that survival of synthetic hybrids before and after polyploidisation is intermediate between the parents, whereas natural hybrids have higher survival than all the other taxa.


结论:We conclude that hybridisation and polyploidy can act as sources of genomic novelty, but adaptive evolution is key in mediating the establishment of young allopolyploid lineages.


 摘  要 


杂交是一种创新性的演化动力,可以增加基因组多样性、促进适应以及物种形成。杂种通常会遇到非常严峻的考验,其中就包括由于亲本双方的基因组不相容性所导致的育性降低。杂种通过全基因组复制形成异源多倍体,可以恢复育性,引起即刻的表型改变,并形成生殖隔离。然而,目前我们对于多倍体谱系的存活情况还不清楚,并且对于近来形成的异源多倍体与其亲本在田间条件下的表现比较少有研究。本文中,作者通过天然形成以及人工方法获得的杂交与多倍体猴面花研究了多倍化如何作用于田间条件下杂种的育性、生殖隔离、表型以及生长表现。作者发现多倍化恢复了育性,并且异源多倍体与其亲本之间形成了生殖隔离。异源多倍体的表型表现出全基因组加倍后典型的gigas效应,植株的器官变得更大,但开花较慢。田间试验显示人工获得的杂种在多倍化前后是父母本的中间型,而天然杂种具有更高的存活率。作者提出杂交和多倍化可以作为基因组创新的来源,但适应性演化才是建立初期异源多倍体谱系的关键。


 通讯作者 


**Mario Vallejo-Marín**


个人简介:

墨西哥国立自治大学,学士;

杜克大学,博士;

多伦多大学,博士后


研究方向:

植物生殖策略演化过程中适应性的作用


doi: 10.1016/j.xplc.2020.100093


Journal: Plant Communications

Published date: July 02, 2020



http://blog.sciencenet.cn/blog-3158122-1241552.html

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