INFLUENCE OF THE PISTIL ON POLLEN-TUBE KINETICS IN PEACH (PRUNUS-PERSICA)
INFLUENCE OF THE PISTIL ON POLLEN-TUBE KINETICS IN PEACH (PRUNUS-PERSICA)
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DOI：
10.2307/2444430
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发表时间：
1989-10-01
影响因子：
3
通讯作者：
ARBELOA, A
中科院分区：
文献类型：
--
作者：
HERRERO, M;ARBELOA, A
桃的花粉管生长与雌蕊结构的变化有关，花粉管必须从柱头向下穿过雌蕊到达胚珠。花粉管沿着雌蕊的生长是不连续的。虽然授粉后7天花粉管到达花柱基部，但受精要到12天后才发生。花粉管在闭孔器顶端停留5天，再停留3天后进入胚珠。花粉管的生长是异养的，开花时淀粉沿着雌蕊道分布，当花粉管经过时消失。不连续的花粉管生长似乎是由雌蕊控制。在花期雌蕊没有完全成熟。雌蕊的成熟意味着许多分泌过程，这些分泌过程以向基的方式发生，从柱头向下到花柱，直到胚珠。柱头和花柱上的这些分泌物中的一些是由授粉引发的;其他的似乎是雌蕊的成熟阶段，并且以离散的方式产生。花粉管依赖于这些分泌物的事实以及这些分泌物不是连续产生的事实赋予雌蕊控制花粉管动力学的作用，并指出，为了成功受精，雄配子体发育和雌蕊成熟需要同步。
Pollen tube growth has been studied in peach and has been related to changes in the pistil structures which the pollen tube has to traverse in its way from the stigma down to the ovule. Growth of the pollen tubes along the pistil is not continuous. While pollen tubes reach the base of the style 7 days after pollination, fertilization does not take place until 12 days later. Pollen tubes stop for 5 days at the top of the obturator and they further stop for 3 days before entering the ovule. The pollen tube growth is heterotrophic; starch, present all along the pistilar tract at anthesis, vanishes as the pollen tubes pass by. Discontinuous pollen tube growth appears to be controlled by the pistil. At anthesis the pistil is not fully matured. Maturation of the pistil implies a number of secretory processes that occur in a basipetal way starting from the stigma down to the style and ending in the ovule. Some of these secretions at the stigma and the style are triggered by pollination; others appear to be a maturative stage of the pistil and are produced in a discrete way. The fact that the pollen tube depends on these secretions together with the fact that these secretions are not continuously produced confer upon the pistil a role of controlling pollen tube kinetics and point out that, for a successful fertilization, male gametophyte development and pistil maturation need to be synchronized.