Pollen wall development in Cryptomeria japonica (Taxodiaceae)
Pollen wall development in Cryptomeria japonica (Taxodiaceae)
复制标题
柳杉（杉科）的花粉壁发育
DOI：
10.1080/00173130052504298
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发表时间：
2000
期刊：
影响因子：
0.9
通讯作者：
N. Sahashi
中科院分区：
文献类型：
--
作者：
K. Uehara;N. Sahashi
用扫描电镜和透射电镜观察了柳杉花粉壁的发育过程。C. japonica的特征在于非囊状突出的乳头。C. japonica由外部颗粒状外壁和内部片层状内壁组成。在四分体时期，原外壁的初始颗粒层首先在小孢子质膜上形成。外消旋体下前内消旋体形式的三层结构。在游离孢子阶段，前孢粉素物质沉积在前外壁和前内外壁上。exexine颗粒增加其体积，endexine颗粒增加其体积。在四分体阶段，乳突突出。乳头的顶端在外壁较薄的地方侧向弯曲。C. japonica与Cunninghamia相似;然而，颗粒状外泌体和层状内泌体的数量和大小不同。在四分体时期，明显的乳突突出并弯曲。
Pollen wall development in Cryptomeria japonica was observed by scanning and transmission electron microscopy. The pollen of C. japonica is characterized by a non-saccate, projecting papilla. The exine of C. japonica consists of the outer granular ectexine and the inner lamellated endexine. At the tetrad stage, the initial granular layer of the pro-ectexine first forms on the microspore plasma membrane. The tripartite lamellae of the pro-endexine form under the pro-ectexine. The prosporopollenin material is deposited on the pro-ectexine and pro-endexine at the free spore stage. The ectexine granule increases its volume and the endexine lamellae thicken. The papilla protrudes during the tetrad stage. The tip of the papilla bends laterally where the exine is thinner. Exine construction in C. japonica is similar to that of Cunninghamia; however, the amount and size of the granular ectexine and lamellated endexine differ. The conspicuous papilla protrudes and bends during the tetrad period.