Temporal shifts in reproductive phenology of cycads: a comparative study in Ceratozamia
Temporal shifts in reproductive phenology of cycads: a comparative study in Ceratozamia
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DOI：
10.1139/cjb-2022-0053
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发表时间：
2022-09-14
期刊：
影响因子：
1.1
通讯作者：
Stevenson，Dennis Wm
中科院分区：
文献类型：
--
作者：
Martinez-Dominguez，Lili;Nicolalde-Morejon，Fernando;Stevenson，Dennis Wm
植物的生殖物候由导致生殖成功的连续生命周期阶段组成。在种子植物中，苏铁和其他雌雄异株的群体具有复杂的生殖系统，其中个体需要两性和同种种群之间的同步。在这里，我们分析了苏铁属CeratozamiaBrongn中三个地理位置接近的物种种群之间的物候。我们描述了花粉和排卵的球花的寿命和它们在整个个体发育过程中的形态变化，并评估了生殖事件之间的同步性，重点是授性和开放花粉阶段的时间和丰度。我们的研究结果表明，在三个物种的生殖时间是高度同步的，和可授性和开放的花粉阶段之间的重叠可以指向不同物种的种群之间的基因流。我们确定了繁殖模式和温度和降水制度之间的相关性。花粉和胚珠球花产生于雨季，而花粉的可授性和花粉的同步期则发生在旱季。种子释放发生在雨季，这有助于保持种子湿润，防止胚干燥。最后，我们强调实用的研究在野生种群的生态和进化的理解苏铁的物候模式。
The reproductive phenology in plants consists of successive life cycle phases leading to reproductive success. In seed plants, cycads and other dioecious groups have complex reproductive systems, where individuals require synchronizations among two sexes and populations of the same species. Here, we analyzed phenology between populations of three geographically close species in the cycad genusCeratozamiaBrongn. We described the lifespan of pollen and ovulate strobili and their morphological changes throughout ontogeny and evaluated synchrony among reproductive events, focusing on the timing and abundance of the receptivity and open pollen phases. Our results showed that the reproductive timing in the three species was highly synchronous, and that the overlap between the receptivity and open pollen phases could point to gene flow among populations of different species. We identified a correlation between the reproductive patterns and the temperature and precipitation regimes. Pollen and ovulate strobili were produced during the rainy season, whereas the period of synchrony between receptivity and pollen occurred during the dry season. The seed release occurred during the rainy season, which could contribute to keep the seed moist and prevent the embryo from drying out. Finally, we highlight the utility of studies in wild populations for the ecological and evolutionary understanding of phenological patterns in cycads.