-- 作者： 魚痴 -- 發表時間： 2006/06/23 07:50pm -------------------------------------------------------------------------------- 編譯王麗娟／法新社巴黎二十一日電 中國大陸科學家在雲南發現一種在不利氣候下會自體授粉的蘭花，這是植物界首例。 大根槽舌蘭的粉紅色花朵，在氣候不利的環境下，會藉由扭轉雄蕊（雄性器官），達到讓雌蕊受精的目的。換句話說，雄蕊抗拒地心引力，將雄蕊末端的花粉囊旋轉三百六十度，將花粉插入雌蕊的柱頭。 大根槽舌蘭生長於雲南海拔一千兩百到兩千公尺的樹幹上，花季為二月至四月，此時通常天氣極度乾燥且無風。在此情況下，花粉無法經由風的攜帶授粉，且因這種蘭花無香無蜜，因此無法吸引蜜蜂或昆蟲來傳遞花粉。 北京清華大學深圳研究所黃萊強（譯音）領導的研究團隊在最新一期「自然」雜誌發表報告說，可能為適應這些環境，大根槽舌蘭發展出自花授粉的機制，而在類似的環境中，或許還有很多植物也有相同發展。 【2006/06/23 聯合報】 ＠ http://udn.com -- 作者： poe -- 發表時間： 2006/06/24 00:00am 不知道是翻譯的關係還是記者認知不同 總覺得這篇用字不是很精確, 提出來大家討論看看 其一,蘭科植物有用雄蕊雌蕊描述的嗎?不就已經癒合成一起了嗎 如果真的能反轉自交.那真的蠻特別的.沒種過這品的. 有那位大大有種過,分享一下吧~ 其二是蘭科應該是花粉塊不是花粉吧.尤其是氣生類蘭花 也應該沒有用風力傳播的吧 不過說到蜜蜂,,小弟倒是曾親眼目睹家裡上板沒幾個月的山採短距槽舌蘭開花被一隻小蜜蜂給「上」了...... 短距的囊袋深度倒剛剛好.側面看還可隱約看到蜜蜂伸舌探底吸蜜,飛走時頭上還頂了兩球花粉塊 看它拼命想用腳撥下來的樣子怪好笑的! -- 作者： semi-alba -- 發表時間： 2006/06/24 05:17am [這篇文章最後由semi-alba在 2006/06/24 05:20am 第 2 次編輯] english news version http://news.yahoo.com/s/ap/20060621/ap_on_sc/china_lonely_orchid;_ylt=Ao.SLfx_hYuxdJxv3TtwUSuzygt.;_ylu=X3oDMTB2dW8yNmN0BGNvbG8DdwRsA1dTMQRwb3MDOQRzZWMDc3IEdnRpZAM- Tue Jun 20, 11:23 PM ET BANGKOK, Thailand - For one type of orchid in China, procreating is a lonely affair. Rather than depending on insects or even the wind for pollination, scientists have discovered that the orchid Holcoglossum amesianum actually fertilizes itself, according to a report in this week's Nature. The orchid defies gravity to twist the male part of its flower into the necessary shape to fertilize the female one, a team led by LaiQuang Huang of Tsinghua University found. The plant does so without the help of sticky fluids or other methods used by self-pollinating plants to ensure that the pollen reaches the egg, LaiQuang reported. This makes it a new method of pollination, he said. The team studied more than 1,900 flowers of this species, which grows on tree trunks in China's Yunnan province and flowers during the dry, windless months of February to April. The orchid produces no scent or nectar, and the researchers did not see a single instance of pollination by an insect or by wind. Instead, the pollen-bearing anther uncovers itself and rotates into a suitable position to insert into the stigma cavity, where fertilization takes place. This sexual relationship is so exclusive that flowers do not even transfer pollen to other flowers on the same plant, researchers found. -- 作者： natsuki -- 發表時間： 2006/06/27 03:30am [UploadFile=CIMG3129_1151350188.jpg][UploadFile=CIMG3130_1151350209.jpg]