Regulation of Pollen Tube Growth
Regulation of Pollen Tube Growth
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DOI：
10.1111/j.1438-8677.1995.tb00773.x
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发表时间：
1995-06
期刊：
影响因子：
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通讯作者：
J. Derksen;T. Rutten;T. Amstel;Anna H. N. de Win;Fiona Doris;M. Steer
中科院分区：
文献类型：
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作者：
J. Derksen;T. Rutten;T. Amstel;Anna H. N. de Win;Fiona Doris;M. Steer
大多数教科书将花粉和花粉管描述为种子植物中携带雄性精细胞的载体。花粉管穿过花柱生长到胚珠，在胚珠中精细胞被输送到胚囊中的卵细胞。花粉管总是生长在一个陌生的环境中：从进化的角度来看，它们来自吸器，原始的小配子体通过吸器以孢子体为食。在裸子植物的分支花粉管中仍然发现吸器形式，它们在雌球花中存活和取食很长一段时间。花粉管有一种特殊的侵入生长形式，或尖端生长。其他具有顶端生长的细胞包括根毛、双极延伸管胞和纤维细胞，以及许多生物体，如许多藻类、苔藓和蕨类植物的原丝细胞和大多数真菌菌丝。尽管这些细胞类型多种多样，但它们基本上具有相同的细胞质成分，因此彼此之间可能表现出许多相似的行为。然而，真菌（包括卵菌门）和褐藻门之间的巨大进化距离可能允许不同的尖端生长模式发展。
Most textbooks describe pollen and pollen tubes as the vectors carrying the male sperm cells in seed plants. The pollen tubes grow through the style to the ovule, where the sperm cells are delivered to the egg cells in the embryo sacs. Pollen tubes always grow in an alien environment: in evolutionary terms they derive from the haustorium through which the primitive microgametophyte fed on the sporophyte. Haustorial forms are still found in the case of ramified pollen tubes of gymnosperms that survive and feed for a long period in the female cone. Pollen tubes have a specific form of intrusive growth, or tip growth. Other cells with tip growth include root hairs, bipolar extending tracheids and fibre cells, and also many organisms such as a number of algae, moss and fern protonemal cells and most fungal hyphae. Diverse as they are, these cell types basically share the same cytoplasmic constituents and thus may show many similarities in behaviour to each other. However, the large evolutionary distance between the fungi (including Oomyceta) and the Phaeophyta may have allowed different modes of tip growth to develop.