Characteristics of flowering and pollination of Leucospermum cordifolium
[Objective]This study aims to understand the flowering and fruiting characteristics of Leuco-spermum cordifolium and the reasons of low fruiting rate in order to promote seed production,hybrid breeding,flowering period regulation,and new variety cultivation.[Methods]This report used L.cordi-folium as materials to study flowering phenology,floral characteristics,pollen vitality,stigma acceptabili-ty,hybridization index,and pollination and fruiting characteristics.[Results](1)The flowering period of L.cordifolium was in late winter,or early spring to summer.(2)The most suitable in vitro germination medium for measuring pollen vitality contained 30 g/L sucrose+150 mg/L boric acid+50 mg/L calcium chloride.(3)The receptivity of the stigma was gradually increased from 1 day to 7 day of flowering,and was strongest from 5 day to 7 day.The results of hybridization index indicated that L.cordi folium was partially self-compatible or cross compatible,requiring pollinators.(4)Field observation showed that fruiting rate was low in its natural state,but it could spontaneously complete pollination and there was no phenomenon of apomixis.(5)The artificial pollination experiment found that L.cordifolium had the highest setting rate of 17.14％,while self-pollination had the lowest setting rate of 4.94％.[Conclusion]The disparity in maturation times of the pistil and stamen is the primary factor contributing to the dimin-ished setting rate of L.cordi folium.The presence of callose on the pistil and ovary,as well as the enlarge-ment of the pollen tube tip,are also important reasons for the low setting rate.
万方数据
维普
