Flexibility of resource allocation in a hermaphroditic-gynomonoecious herb through deployment of female and male resources in perfect flowers.
Flexibility of resource allocation in a hermaphroditic-gynomonoecious herb through deployment of female and male resources in perfect flowers.
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DOI：
10.3732/ajb.1600397
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发表时间：
2017-03
影响因子：
3
通讯作者：
Jannathan Mamut;Ying-Ze Xiong;D. Tan;Shuang‐Quan Huang
中科院分区：
文献类型：
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作者：
Jannathan Mamut;Ying-Ze Xiong;D. Tan;Shuang‐Quan Huang
研究的前提已经假设，两种花类型允许灵活的分配资源的女性和男性的功能，但性别分配假说的经验证据仍然很少在gynomonoeconomous物种。为了表征资源分配到雌花和完美的花和分配的完美的花之间的雌雄同株和两性个体，我们研究了灵活性，以及是否女性偏向的分配增加与植物的大小在雌雄同株的草本异翅独尾草。方法调查不同居群中雌花同株的个体频率、花产量和植株大小。比较了E.异翅目关键结果：在9个种群中，雌性同株植物的频率从2-17%不等。只有较大的植物在总状花序的底部产生雌花。雌花和完全花产量都随植株大小成比例增加。雌花并没有产生更少的生物量比完美的花从两性或gynomonoecious植物。然而，无论是雌花还是完全花，雌雄同株的雌花和完全花的雄蕊质量都比雌雄同体的完全花轻，但雌蕊质量比雌雄同株的完全花大。结论：虽然在E. anisopterus，性别分配的灵活性，在雌雄同株的物种被证实，雌雄同株的个体有一个女性偏向的花分配相比，两性个体。这样的比较雌雄同株的雌雄同体的个人允许我们揭示了一个性别调整策略：灵活性的性投资植物。
PREMISE OF THE STUDY It has been hypothesized that two flower types permit flexible allocation of resources to female and male functions, yet empirical evidence for the sex-allocation hypothesis remains scarce in gynomonoecious species. To characterize resource allocation to pistillate and perfect flowers and allocation of perfect flowers between gynomonoecious and hermaphroditic individuals, we examined the flexibility and whether female-biased allocation increases with plant size in the hermaphroditic-gynomonoecious herb Eremurus anisopterus. METHODS Frequency of gynomonoecious individuals, flower production, and plant size were investigated in different populations. Floral allocation was compared among the three flower types of E. anisopterus. KEY RESULTS Frequency of gynomonoecious plants varied from 2-17% in nine populations. Only larger plants produced female flowers at the bottom of racemes. Both female and perfect flower production tended to increase proportionately with plant size in gynomonoecious individuals. Female flowers did not produce less biomass than perfect flowers from hermaphroditic or gynomonoecious plants. However, both female and perfect flowers from gynomonoecious individuals had lighter stamen mass, but larger pistil mass, than perfect flowers from hermaphrodites. CONCLUSIONS Although the prediction of an increase in female flower number with plant size was not observed in E. anisopterus, the flexibility of sex allocation in gynomonoecious species was confirmed in that gynomonoecious individuals had a female-biased floral allocation compared to hermaphroditic individuals. Such comparisons of gynomonoecious to hermaphroditic individuals permit us to unveil a sexual adjustment strategy: flexibility of sexual investments within plants.