慈姑雌花在自然居群中的受粉过程——花粉粒落置、萌芽及花粉管生长的荧光显微观察

The process of pollen accepting in natural population of Sagittaria trifolia Linn. —observation of p

摘要: 用荧光显微术观察了慈姑（ＳａｇｉｔｔａｒｉａｔｒｉｆｏｌｉａＬｉｎｎ）不同时期的雌花柱头上花粉粒的落置、萌发及花粉管的生长过程与途径。结果表明：该种雌花开花２ｈ柱头受粉率为０，开花４ｈ和８ｈ受粉率分别为５３８％和９８３％，柱头上花粉萌发率达１００％；花粉管沿雌蕊之向心一侧的组织中穿行，至子房基部后部分花粉管转向胚珠，由珠孔进入珠心。本研究发现该种花粉管常穿过子房基部至花托组织，并可进入其他雌蕊中，作者认为这种行为可能对保证雌花的结实率有一定意义

Abstract: The pollen loading ,germinating and pollen tube growth during the process of flowering of Sagittaria trifola Linn.was observed by fluorescence microscopy.The results are as follows :The rate of pollen accepting on stigmas 2 hours after flowers opening is 0.This value of 4 hours or 8 hours after flowers opening is 53.8%or 98.3% respectively.The frequency of pollen germination on stigmas is 100%.Pollen tubes penetrated the centripetal tissues to the bases of pistils.Some pollen tubes circumambulated to the ov...