Drastic shift in flowering phenology of F1 hybrids causing rapid reproductive isolation in Imperata cylindrica in Japan
Drastic shift in flowering phenology of F1 hybrids causing rapid reproductive isolation in Imperata cylindrica in Japan
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F1 杂交品种开花物候的急剧变化导致日本白茅快速生殖隔离
DOI：
10.1111/1365-2745.13890
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发表时间：
2022
影响因子：
5.5
通讯作者：
Tominaga Tohru
中科院分区：
文献类型：
--
作者：
Nomura Yasuyuki;Shimono Yoshiko;Mizuno Nobuyuki;Miyoshi Ikuya;Iwakami Satoshi;Sato Kazuhiro;Tominaga Tohru
杂交是表型变异的主要来源，也是进化的驱动力。虽然新的杂交性状往往会破坏亲本表型与环境之间的适应关系，但新的杂交性状如何破坏局部适应仍不清楚。在这里，我们报告了一个新的表型杂交种之间的两个白茅生态型有助于快速生殖隔离从他们的父母和影响杂种适合度。从20世纪80年代到21世纪10年代在日本各地收集了cylindrica，以探索杂交种的遗传群体结构。通过对两种生态型及其杂种在自然生境和普通园林中的花期、结实率和发芽率的调查，对杂种群体结构的遗传分析表明，杂种群体仅由F1代个体组成，无高世代杂种。F1代植株的开花物候推迟到秋季，比亲本生态型晚5-6个月。开花物候的剧烈变化阻止了F1的回交。此外，它改变了他们的种子传播时间到冬天。低温抑制了种子的萌发，种子可能在下一个春天之前腐烂，导致F2代的缺失。我们确定了F1种群的环境错配是维持F1种群的一种特殊机制。我们已经证明，这种开花物候不匹配促进父母和F1 s之间的生殖隔离，并影响各种时间组件的杂交种，导致在一个独特的杂交人口只包括F1 s。该系统揭示了杂交性状在驱动快速生殖隔离中的重要性。
Hybridization is a major source of phenotypic variation and a driving force for evolution. Although novel hybrid traits can often disrupt adaptive relationships between the parental phenotypes and their environments, how new hybrid traits disrupt local adaptation remains unclear. Here, we report how a new phenotype of hybrids between twoImperata cylindricaecotypes contributes to rapid reproductive isolation from their parents and affects hybrid fitness.We analysed 350 accessions ofI. cylindricacollected from the 1980s to the 2010s throughout Japan to explore the genetic population structure of the hybrids. We surveyed the flowering periods, seed set, and germination of two ecotypes and their hybrids in both natural habitats and common gardens.Genetic analyses of population structure revealed that the hybrid populations consisted of only F1individuals, without advanced generation hybrids. The flowering phenology of the F1plants was delayed until autumn, 5–6 months later than the parental ecotypes. The drastic shift in flowering phenology prevents F1s from backcrossing. In addition, it changes their seed dispersal time to winter. Germination is inhibited by low temperatures, and the seeds likely decay before the next spring, resulting in the absence of an F2generation. We identified the environmental mismatch of the F1population as a specific mechanism for the maintenance of an only F1population.Synthesis. We have demonstrated that this flowering phenology mismatch promotes reproductive isolation between the parents and F1s and affects various temporal components of the hybrids, resulting in a unique hybrid population consisting only of F1s. This system sheds light on the importance of hybrid traits in driving rapid reproductive isolation.
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影响因子：
3.3
作者：
J. K. Pritchard;Matthew Stephens;Peter Donnelly
通讯作者：
J. K. Pritchard;Matthew Stephens;Peter Donnelly
桉树中 F1 杂种的不存活性：以 E. ovata × E. globulus 为例
影响因子：
3.8
作者：
G. Lopez;B. Potts;P. Tilyard
通讯作者：
P. Tilyard
影响因子：
2.1
作者：
Y. Kameyama;T. Kasagi;G. Kudo
通讯作者：
Y. Kameyama;T. Kasagi;G. Kudo
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影响因子：
1.3
作者：
Ikuya Miyoshi;T. Tominaga
通讯作者：
T. Tominaga
行为隔离可能促进慈鲷的同倍体杂交物种形成
影响因子：
2.1
作者：
O. Selz;R. Thommen;M. Maan;O. Seehausen
通讯作者：
O. Seehausen