Observation And Analysis On Biological Characteristics Of 'Juxianghong'—The Red Meat Mutation Type Of 'Anjiang' Pomelo

Pummelo germplasm resources are very rich,which have been taken seriously in the breeding of good varieties and have been bred a large number of varieties at present.The seedless fruit has a certain business value and market competitiveness.It was favored by the vast number of consumers for easy to eat,crisp and highly nutritious.The important target of breeding is breeding good varieties of seedless pomelo.It is important that exploring the inherent cause of seedless pomelo to breeding improved seedless varieties,extension and cultivation of seedless pomelo.The experimental material of this study is ‘Juxianghong',and anjiang as the control.The difference was studied by observing the phenophase,plant morphology,floral characters,pollen activity,the growth of pollen tube of self-and cross pollination in stigma,fruit quality,fruit seeds and fruit tolerance test both ‘Juxianghong' and anjiang.In this study,the reason of‘Juxianghong' was preliminarily proved.The aim of this study was to provide theoretical reference for the future development of seedless Citrus.The main result of this study were as follows:1.By observing the phenophase,botanical morphology,growth habits of ‘Juxianghong'and Anjiang pomelo,a conclusion can be drawed,which shows there's no difference between Juxianghong and control group in phenophase,trees,branches of shoots,shape and size of leaves.Different hybridization pollination shows significant differences,which indicates that different pollen pollination makes a difference in Juxianghong's output.2.Both the two varieties flowers' organ structures are integrated.‘Juxianghong' has38.89% vitro pollen germination,96.75% pollen stain-ability and 98.81% pollen germination rate.The microscope scanning result shows that Juxianghong's pollen grains have a flat shape,without dry or deformed one,which means Juxianghong's pollen has developed normally.In that case,we can basically believe that seedless Juxianghong doesn't result from male sterility.3.Through the observation of ‘Juxianghong' and Anjiang pomelo selfing and outcrossing by fluorescence microscopy,we find the self-pollination and cross pollination of the two varieties are all in normal germination.After ‘Juxianghong' self pollination andcross pollination 96 h,the outcrossing pollen tubes could grow normally,but the selfing pollen tubes in the style grow slowly.After pollination 120 h,the outcrossing pollen tube extends to the base of style,but the selfing pollen tube was stagnant and unable to continue extending.Cross pollinated fruit has 98.97 seeds.Self pollinated fruit has seeds that has no normal development.In summary,‘Juxianghong' has self incompatibility.4.By determining fruit quality,a conclusion can be drawed,which shows ‘Juxianghong'has dark red flesh,crisp meat,content fruit juice content,moderate sour flavor quality.It is determined that the flesh of the resource is bright color,fresh taste and good quality.so,‘Juxianghong' can be used as an excellent fresh food variety development.5.Under the condition of conventional 75 d air-cooler storage,‘Juxianghong'and Anjiang pomelo is not easy to occur the phenomenon of weightlessness,decay,quality and flavor of decline.