广西植物2026，Vol.46Issue(2)：235-244,10.DOI:10.11931/guihaia.gxzw202412042
雪松花粉的淀粉粒在萌发过程中的变化
Changes in starch granules in Cedrus deodara pollen during germination
摘要
Abstract
The gymnosperm cedar(Cedrus deodara)is a wind-pollinated plant,and exhibits a significantly slower process of pollen germination and pollen tube growth than that of angiosperm(e.g.,maize).Starch is the main energy source for pollen germination in wind-pollinated plants.To reveal the characteristics of starch granules in cedar pollen and their changes during pollen germination,the pollens of cedar and maize were used as materials to compare the changes of starch granules and their effects during pollen germination by physiological and biochemical,cytological and proteomic approaches.The results were as follows:(1)Compared with mature maize pollen,the starch content in cedar pollen was lower,but the amylose proportion was higher.(2)Starch granules in cedar pollen were irregular and cobblestone-like,whereas those in maize were short and rod-shaped.(3)The activities of α-amylase and β-amylase,and the types and activities of isoenzymes were much lower than those in maize pollen.(4)Starch granules in mature cedar pollen were primarily distributed in the cytoplasm around the inner pollen wall,and gradually moved into pollen tube during pollen germination.Meanwhile,the types and activities of starch isoenzymes increased,and the degradation of starch increased,thereby producing more soluble sugar to provide energy for pollen germination.This research provides new clues for understanding the reasons for the slow pollen germination and pollen tube growth of gymnosperms.关键词
风媒花粉/雪松花粉/淀粉粒/花粉萌发/淀粉酶活性/淀粉结合蛋白Key words
anemophilous pollen/cedar(Cedrus deodara)pollen/starch granules/pollen germination/amylase activity/starch-associated proteins分类
农业科技引用本文复制引用
牛靓洁,王文康,丁慧莹,王伟..雪松花粉的淀粉粒在萌发过程中的变化[J].广西植物,2026,46(2):235-244,10.基金项目
国家自然科学基金联合基金(U1904107). （U1904107）
