两种 Chamaecrista 物种中的 Florivory：分泌毛状体对 florivores 有效吗？,Plant Species Biology

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两种 Chamaecrista 物种中的 Florivory：分泌毛状体对 florivores 有效吗？
Plant Species Biology ( IF 1.4 ) Pub Date : 2022-09-07 , DOI: 10.1111/1442-1984.12386
Gilmar Moreira da Silva ₁ , Ana Tereza Araújo Rodarte ₁ , Cristine Rodrigues Benevides ₁ , Heloisa Alves de Lima ₁

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Chamaecrista的Florivory 在发生率、强度和受影响的花卉结构上各不相同。由于花朵是多功能单位，因此损伤类型会以不同方式影响繁殖成功率。油树脂分泌毛状体，存在于Chamaecrista物种的萼片中，Absus 部分，被认为可以抑制花香。我们在Chamaecrista cathartica和Chamaecrista catharticoides中记录了 florivory为了确定损害的频率、受害最严重的花轮、对繁殖的影响以及分泌毛状体在抑制花卉方面的有效性。该研究是在巴西的 Parque Estadual do Ibitipoca 进行的。在两个开花期每月监测每个物种的 20 只个体，以记录开花强度、开花率和坐果率，并确定毛状体在抑制开花方面的有效性。这两个物种有不同的开花模式，C. cathartica 是一年生的，C. catharticoides是连续的，两者都在夏季更强烈。Florivory 主要发生在冬季，对花结构的影响不均匀，导致不同的花功能丧失。Florivory 减少了这两个物种的坐果，但C. catharticoides受到的影响要大得多。C. catharticoides中受损结构的多样性导致直接（由于胚珠和花粉粒损失导致雌性和雄性适应性降低）和间接（花卉资源损失和花卉吸引力降低）影响。管状花瓣的损坏可能进一步导致这种结构介导的特殊授粉机制的丧失。萼片背面的分泌毛抑制了早期发育果实的花蕾和草食性。

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Florivory in two Chamaecrista species: Are secretory trichomes effective against florivores?

Florivory in Chamaecrista varies in occurrence, intensity, and the floral structures affected. As flowers are multifunctional units, the type of damage can impact reproductive success in different ways. Oil-resin-secreting trichomes, present in the sepals of Chamaecrista species, section Absus, are suggested to inhibit florivory. We recorded florivory in Chamaecrista cathartica and Chamaecrista catharticoides in order to determine the frequency of damage, floral whorls most damaged, impact on reproduction, and effectiveness of secretory trichomes in inhibiting florivory. The study was conducted in the Parque Estadual do Ibitipoca, Brazil. Twenty individuals of each species were monitored monthly over two bloom periods to record the flowering intensity, rates of florivory, and fruit set and to determine the effectiveness of trichomes in inhibiting florivory. The two species had different flowering patterns, annual for C. cathartica and continuous for C. catharticoides, both more intense during summer. Florivory occurred mainly in the winter and affected floral structures unevenly, resulting in loss of different floral functions. Florivory reduced the fruit set of both species, but C. catharticoides was considerably more impacted. The diversity of damaged structures in C. catharticoides resulted in direct (reduced female and male fitness due to loss of ovules and pollen grains) and indirect (loss of floral resources and reduced floral attractiveness) impacts. Damage to the tubular petal could further result in loss of specialized pollination mechanisms mediated by this structure. Secretory trichomes on the abaxial surface of sepals inhibited florivory of buds and herbivory of early-developing fruits.

更新日期：2022-09-07

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