ECOLOGICAL NOVELTY BY HYBRIDIZATION: EXPERIMENTAL EVIDENCE FOR INCREASED THERMAL TOLERANCE BY TRANSGRESSIVE SEGREGATION IN TIGRIOPUS CALIFORNICUS
ECOLOGICAL NOVELTY BY HYBRIDIZATION: EXPERIMENTAL EVIDENCE FOR INCREASED THERMAL TOLERANCE BY TRANSGRESSIVE SEGREGATION IN TIGRIOPUS CALIFORNICUS
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杂交带来的生态新颖性：通过加州虎的跨越隔离提高耐热性的实验证据
DOI：
10.1111/evo.12254
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发表时间：
2014
期刊：
影响因子：
3.3
通讯作者：
R. Burton
中科院分区：
文献类型：
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作者：
R. Pereira;Felipe S. Barreto;R. Burton
杂种的早期世代既表现出遗传不亲和性，又表现出表型新奇。深入了解这些内在和外在选择之间的相互作用是否在几代重组后仍然存在，需要实验研究。为了解决这个问题，我们使用种群间杂交和重组自交系（RILs）的桡足类Tigriopus californicus，并专注于两个性状是相关的多样化的这个物种：生存在发展过程中的耐受性和热应力。两个种群对之间的实验杂交表明，两个耐热种群之间的大多数RIL对对各自亲本致死的温度表现出增强的耐受性，而耐热和热敏种群之间的RIL是中间的。虽然种群间杂交在早期世代的杂种受内在选择的影响，大多数的F9 RIL样本恢复健身的父母的水平。总之，这些结果表明，几代重组允许作为耐热性和细胞核不相容性基础的基因的独立分离，允许某些重组谱系在先前未被亲本分类群使用的小生境中存活（即，更温暖的热环境）而不引起内在选择。
Early generations of hybrids can express both genetic incompatibilities and phenotypic novelty. Insights into whether these conflicting interactions between intrinsic and extrinsic selection persist after a few generations of recombination require experimental studies. To address this question, we use interpopulation crosses and recombinant inbred lines (RILs) of the copepod Tigriopus californicus, and focus on two traits that are relevant for the diversification of this species: survivorship during development and tolerance to thermal stress. Experimental crosses between two population pairs show that most RILs between two heat‐tolerant populations show enhanced tolerance to temperatures that are lethal to the respective parentals, whereas RILs between a heat‐tolerant and a heat‐sensitive population are intermediate. Although interpopulation crosses are affected by intrinsic selection at early generational hybrids, most of the sampled F9 RILs have recovered fitness to the level of their parentals. Together, these results suggest that a few generations of recombination allows for an independent segregation of the genes underlying thermal tolerance and cytonuclear incompatibilities, permitting certain recombinant lineages to survive in niches previously unused by parental taxa (i.e., warmer thermal environments) without incurring intrinsic selection.
DOI：
10.1017/s0016672300032547
发表时间：
1994-08
期刊：
Genetical research
影响因子：
--
作者：
M. Slatkin;R. Lande
通讯作者：
M. Slatkin;R. Lande