猴花花大小与水分利用效率的遗传相关性。

Q2 Agricultural and Biological Sciences

Evolutionary Ecology Research Pub Date : 2008-01-01

John K Kelly, Liza M Holeski, H S Arathi

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引用次数: 0

摘要

问:干旱胁迫下的水分流失是否代表了花大小进化的重要生理限制?生物:黄猴花(Mimulus guttatus)的遗传多样性种群，最初取样于美国俄勒冈州的高山草甸。方法:我们在水分充足和干旱胁迫条件下种植了三种不同基因型(小花、中花和大花)的植物，并使用稳定碳同位素测量了水分利用效率。结果:在水分充足的条件下，不同花大小基因型植物的水分利用效率没有差异，但在干旱胁迫下，小花型植物的水分利用效率明显低于中、大基因型植物。无论这种矛盾的结果是花大小的直接影响还是间接(即多效性)影响，花和生理性状之间存在遗传相关性表明，选择其中一个确实会影响另一个。

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The genetic correlation between flower size and water use efficiency in monkeyflowers.

QUESTION: Does water loss during drought stress represent an important physiological constraint on the evolution of flower size? ORGANISM: A genetically diverse population of Mimulus guttatus (yellow monkeyflower) originally sampled from an alpine meadow in Oregon, USA. METHODS: We grew plants of three different genotypic classes (small, medium, and large flowered) under both well-watered and drought-stress conditions and measured water use efficiency using stable carbon isotopes. RESULTS: There was no difference in water use efficiency among flower size genotypes under well-watered conditions, but the water use efficiency of small-flowered plants was substantially lower than that of medium or large genotypes under drought stress. Whether this paradoxical result is a direct effect of flower size or an indirect (i.e. pleiotropic) effect, the presence of a genetic correlation between floral and physiological traits indicates that selection of one does impact the other.

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来源期刊

Evolutionary Ecology Research 生物-进化生物学

自引率

0.00%

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审稿时长

>12 weeks

期刊介绍： Evolutionary Ecology Research publishes original research contributions focusing on the overlap between ecology and evolution. Papers may treat any taxon or be general. They may be empirical, theoretical or a combination of the two. EER prefers conceptual contributions that take intellectual risks or that test ideas.