Plant Diversity ›› 1996, Vol. 18 ›› Issue (03): 1-3.
• Articles •
YE Bao-Xing, XI Xiang-Yuan
Microsporogenesis and male gametophyte formation in Dolichos lablab L.were examined by using transmission electron-microscopy. It is the first time to be observed that the plastids and mitochondria have undergone two cycles of dedifferentiation and redifferentiation during the pro- cess of microsporogenesis and pollen development. In the first cycle the dedifferentiation of plastids and mitochondria occurs at prophase I of meiosis and the redifferentiation at telophase II. The second cycle is from dedifferentiation of plastids and mitochondria at late microspore stage to redifferentiation of plastids at early 2-celled pollen stage and of mitochondria at late 2-celled pollen. From the early microspore to the late 2-celled pollen stages, the golgi bodies are abundant.They are involved in the formation of both nexine and intine of pollen. The wall ingrowths of pri-mary intine of early 2-celled pollen enlarge the surface areas of the vegetative cell plasma mem-brane, and may facilitate the uptake of nutrients from the anther locule.
YE Bao-Xing, XI Xiang-Yuan. ULTRASTRUCTURE OF POLLEN DEVELOPMENT IN DOLICHOS LABLAB[J]. Plant Diversity, 1996, 18(03): 1-3.
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