| | [這篇文章最後由csyin在 2006/02/18 08:48pm 第 1 次編輯]
title
Flowering phenology and reproductive biology of Drosera anglica (Droseraceae)
abstract
Prompted by the sparse knowledge of the reproductive biology of carnivorous plants, compared with studies of their trapping habits, we investigated the flowering phenology and pollination biology of Drosera anglica Huds. in two fens in mid-western Canada. Seed set and germination were used to compare the effectiveness of a series of pollination treatments, including single insect visits to virgin flowers. Flowers opened during mid-morning but closed by early afternoon, and exhibited pseudo-cleistogamic behaviour in cool, overcast weather. D. anglica was found to be self-compatible, and able to self-pollinate and self-fertilize. Geitonogamy was an uncommon mode of self-reproduction because plants typically possessed a lone inflorescence upon which a single, short-lived flower opened, a few days before the next bud reached anthesis. Insect visits to the fragrance-lacking, nectarless flowers, chiefly by flies (Diptera: Syrphidae), were infrequent (one visit per 1 h 40 min of observation), and the low frequency of seed set and low numbers of seeds per fruit in pollination treatments involving insects, suggest the species does not rely on insects to effect pollination. Self-pollination, with or without the aid of a vector (insects, wind) was as effective as natural pollination; ultimately, autogamy is chiefly responsible for natural seed set. Thus, the species exhibits characteristics of facultative autogamy.
source
Gillian L. Murza and Arthur R. Davis. Botanical Journal of the Linnean Society, 2005, 147, 417–426.
link
http://www.blackwell-synergy.com/doi/abs/10.1111/j.1095-8339.2005.00395.x
標題
Drosera anglica (Droseraceae)的植物開花物候學與生殖生物學
摘要
與捕蟲習性的研究比較起來，食蟲植物在生殖生物學方面的貧乏知識激使我們研究兩個位在加拿大中西部的沼澤中，D. anglica Huds的植物開花物候學及生殖生物學。結實率和發芽率用來比較一系列授粉處理方法的有效性，這些授粉處理方法包含單一昆蟲對處女花的拜訪。這種毛氈苔的花朵在早上綻放而在中午過後凋謝，在天氣較冷時顯現出假性閉鎖授粉的特性，在陰天時則表現出自交親和性，並可自花授粉與自花授精。同株異花授粉則為自體繁殖中不常見的模式，這是因為這種植物典型來說只長出單獨一根花序，當一朵短命的花開之時，鄰近的花苞則是在幾天前開過。昆蟲之中會拜訪這種沒有花香和花蜜的花，主要是蠅類(雙翅目：食蚜蠅科)。來訪的次數並不頻繁(在觀測期間每一小時40分鐘一次)，所以結實率之中與一個果實內的種子，只有少數比例是因為昆蟲授粉所造成。這些現象指出這種毛氈苔並不是依賴昆蟲來有效地授粉。有或沒有助力(昆蟲、風)參與的自花授粉則與自然授粉一樣有效；最後，自花授粉是主要造成自然結實率的原因。因此這種毛氈苔具有自花授粉的特徵。
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2006/02/18 08:43pm 
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