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首页> 外文期刊>International journal of plant sciences >TEMPERATURE-DEPENDENT FLUCTUATION OF STAMEN NUMBER IN CARDAMINE HIRSUTA (BRASSICACEAE)
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TEMPERATURE-DEPENDENT FLUCTUATION OF STAMEN NUMBER IN CARDAMINE HIRSUTA (BRASSICACEAE)

机译：芥子油（芥菜）中雄蕊数的温度依赖性波动

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摘要

Floral organ number is often fixed within families, and the basic floral ground plan of Brassicaceae is well conserved. Cardamine hirsuta L. (Brassicaceae) shows variation in lateral stamen number, that is, zero to two lateral stamens. The aim of this study was to examine whether temperature conditions alter stamen number. Temporal changes in the frequency of flowers with zero, one, and two lateral stamens were assessed during the flowering periods of a natural population and a garden-transplanted population in Japan. We conducted an experiment to evaluate how temperature regimes during flowering (15715℃ and 15°/5℃) alter the number of stamens. The proportion of flowers with zero lateral stamens increased in both the natural and the garden-transplanted population as the flowering season progressed. In the growth experiment, lateral stamen numbers fluctuated even within individual inflorescences, but the frequency of flowers with zero lateral stamens was higher in the high-temperature condition than in the low-temperature condition. Temperature-dependent phenotypic plasticity is likely to be the cause of the field-observed variation in lateral stamen number for C. hirsuta. Developmentally unstable but partly temperature-dependent production of the lateral stamen may be an indication of some epigenetic regulations as an underlying mechanism.
机译：花器官的数目通常在家庭中是固定的，十字花科的基本花基计划得到很好的保护。野蔷薇科（十字花科）显示出侧向雄蕊数量的变化，即从零到两个侧向雄蕊。这项研究的目的是检查温度条件是否会改变雄蕊数量。在日本的自然种群和花园移栽种群的开花期，评估了具有零，一和两个侧雄蕊的花的频率随时间的变化。我们进行了一项实验，以评估开花期间（15715℃和15°/ 5℃）的温度状况如何改变雄蕊的数量。随着开花季节的进展，自然雄蕊和花园移植的雄蕊中具有零侧雄蕊的花比例都增加了。在生长实验中，即使在单个花序中，侧向雄蕊数量也波动，但是在高温条件下横向雄蕊为零的花的频率高于在低温条件下。温度相关的表型可塑性很可能是实地观察到的C. hirsuta侧向雄蕊数量变化的原因。侧雄蕊发育不稳定但部分依赖温度的产生可能表明某些表观遗传调控是潜在的机制。

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