Gender expression in Sedum praealtum A. DC. (Crassulaceae) in Central Veracruz, Mexico

IF 0.7 4区生物学 Q4 PLANT SCIENCES Adansonia Pub Date : 2020-09-21 DOI:10.5252/adansonia2020v42a13

A. Hernández-Ramírez

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Abstract

ABSTRACT Inflorescence type and design determine the position of reproductive meristems and sequence of flowers opening. I examined the gender expression over two entire flowering seasons in Sedum praealtum A. DC. (Crassulaceae) in Central Veracruz, Mexico. Specifically, I studied the floral longevity, sexual-phase duration, flower opening within an inflorescence and sex ratio in the species. I observed that the 8-days flower initiated in male-phase and then switched to female-phase. An extended time of pollen presentation by gradual anthers dehiscence caused an incomplete protandry in the species. The basal-positioned floral buds reached anthesis sooner than the distal-positioned floral buds, resembling an acropetal flowering sequence. Inflorescences production ceased in the middle of the flowering season, whereas flower opening remained constant over reproductive season of the species. The opening of flowers in successive cohorts linked to changes in the flower sexual-phase phenology caused an initial sex expression toward maleness and a balanced sexual expression from the peak to the end of reproductive season in the population sampled. This study highlights the important influence that variations in onset and duration of sexual-phase of flowers can have on sex expression in flowering plants.

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荒漠景天性别表达的研究。(天竺葵科)产于墨西哥韦拉克鲁斯中部

花序类型和花序设计决定了生殖分生组织的位置和开花顺序。我研究了Sedum praealtum A. DC在整个两个开花季节的性别表达。(天竺葵科)产于墨西哥韦拉克鲁斯中部。具体来说，我研究了该物种的花寿命、性期持续时间、花序内开花和性别比例。我观察到8天花期开始于雄花期，然后转入雌花期。由于花药逐渐开裂，花粉呈现时间延长，导致本种不完全原雄蕊。位于基部的花蕾比位于上部的花蕾早开花，类似于顶尖的开花序列。花期中期花序停止生长，而在整个繁殖季节开花保持不变。在连续的群体中，花的开放与花的性相物候变化有关，导致了种群中最初的性别表达向雄性倾斜，并且从繁殖季节的高峰期到繁殖季节结束，性别表达趋于平衡。本研究强调了花性期的开始和持续时间的变化对开花植物性别表达的重要影响。

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来源期刊

Adansonia 生物-植物科学

CiteScore

1.30

自引率

12.50%

发文量

审稿时长

>12 weeks

期刊介绍： Adansonia is a fast-track and peer-reviewed journal of plant biology, devoted to the inventory, analysis and interpretation of vascular plants biodiversity. It publishes original results, in French or English, of botanical research, particularly in systematics and related fields: morphology, anatomy, biology, ecology, phylogeny, biogeography, etc. All articles published in Adansonia are compliant with the different nomenclatural codes. A copyright assignment will be signed by the authors before publication.