Temporal variation in pollinarium size after its removal in species of Bulbophyllum: a different mechanism preventing self-pollination in Orchidaceae
Temporal variation in pollinarium size after its removal in species of Bulbophyllum: a different mechanism preventing self-pollination in Orchidaceae
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DOI：
10.1007/bf00984365
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发表时间：
1999-01-01
影响因子：
1.9
通讯作者：
Semir, J
中科院分区：
文献类型：
--
作者：
Borba, EL;Semir, J
在两个亲缘关系很近的兰科植物Bulbophyllum inoluum和B.ipanemense中，在移除后不久，授粉器的直径大约是柱头腔入口的两倍，平均需要105到135分钟的时间来缩小宽度并允许授粉。由于这些物种的传粉者在去除授粉后在同一朵花中停留了几分钟，这一以前在兰科中未知的机制在防止自花授粉方面可能非常重要。这一机制不会发生在B.wedellii中，并且传粉者在移除花粉后不会留在花中。卷叶甜菜的柱头腔直径较小，与甜菜进行种间授粉的机会减少了50%，并且种间杂交完全是单向的。这对于保持这些共地物种之间的隔离是很重要的，这些物种共享相同的传粉者并同步开花。
In Bulbophyllum involutum and B. ipanemense (Orchidaceae), two closely related species, shortly after removal the pollinarium has a diameter of approximately twice that of the entrance of the stigmatic cavity, requiring a mean time of 105 to 135 minutes to shrink in width and allow pollination. Because the pollinators of these species remain for some minutes in the same flower after removing the pollinia this mechanism, previously unknown in Orchidaceae, may be very important in preventing self-pollination. This mechanism does not occur in B. weddellii, and the pollinator does not remain in the flower after removing the pollinia. The smaller diameter of the stigmatic cavity in B. involutum reduces by 50% the chances of interspecific pollination with B. weddellii, and interspecific crossing is strictly unidirectional. This is important in maintaining isolation between these sympatric species, which share the same pollinators and have synchronized flowering.