巴戟天花药发育中多糖和脂滴类物质的分布呈现一定的规律:减数分裂之前,花药壁的绒毡层细胞中有少量脂滴,其他细胞中脂滴和淀粉粒都很少。四分体时期,四分体小孢子中开始出现脂滴,绒毡层细胞中的脂滴较以前增加,其他细胞中的脂滴和淀粉粒仍然很少。小孢子早期,游离小孢子在其表面形成了花粉外壁,靠外壁下方有一层周缘分布的多糖物质。绒毡层细胞中的脂滴明显减少。发育晚期的小孢子中形成一个大液泡,细胞质中出现淀粉粒;同时在药壁和药隔组织中也出现了淀粉粒。此时绒毡层退化。在二胞花粉早期,花粉中积累了大量淀粉粒和一些脂滴。但在成熟的花粉中(二胞花粉晚期),淀粉粒消失,只有一定数量的脂滴保留。巴戟天成熟花粉中积累的营养物质主要为脂滴。Distribution of polysaccharides and lipids in the developing anthers of Morinda officinalis How was regular.There were a few lipid drops in the sporogenous cells of young anthers,while neither lipid drops nor starches were found in other anther cells.Before the meiosis of microspore mother cells,some lipids appeared in tapetal cells.The size of tapetal cells began to increase at this stage.At the stage of tetrad,the lipids in the tapetal cells increased,and many lipid drops accumulated in the cells.Some lipids also appeared in tetrad microspores at this time.There were still no starches in young anther cells,and only cell wall of the cells formed anther wall and callose wall in tetrads displayed the feature of polysaccharids.During microspore development,the lipids in tapetal cells decreased evidently.The lipids in the young microspore also disappeared.There were still no starches in anther.At late microspore stage,some starches accumulated in microspore and appeared in anther wall and connective cells.Tapetal cells degenerated at this stage and the lipid drops concentrated to form lipid block.At early stage of 2-celled pollen,the vegetative cell accumulated a large number of starches,which disappeared with pollen development.Lipids were the main nutritional material accumulated in mature pollen of M.officinalis.国家自然科学基金(30970275);福建省漳州市科技局课题(Z2008038
