Studies on characterization of fruit development of interspecific hybrid cultivar——‘Jinyan'

【Objective】The objective of the study was to better understand the fruit development regularityof the‘Jinyan'and its parental species.【Methods】The dynamic variation of fruit weight,soluble solidscontent,firmness,total soluble sugar,reducing sugar,total acid and content of starch were examined in‘Jinyan'and its parental species(Actinidia eriantha cv.‘6113',A. chinensis cv.‘Jintao') respectively.【Results】The variation of fruit weight showed triple sigmoid curve in‘Jinyan'and its maternal parent,but double sigmoid curve in paternal parent. The fruit firmness and content of acid increased at first andthen decreased in‘Jinyan'and its parents. The variation curves of soluble solids content,total solublesugar and reducing sugar were stable at early developmental stage and then increased quickly at 2 monthsbefore harvesting in‘Jinyan'and its parents. The accumulation of starch started at 55 days after the flow-er-fading in‘Jinyan'and the parents,and reached the maximum at 165 days and 155 days in‘Jinyan'and the parents,respectively. At the early stage of starch accumulation,the change of soluble solids and total sugar content seemed to be less,while the content of soluble solids and total sugar increased rapidlyat the late stage of starch degradation.【Conclusion】The research results indicated that the fruit growthcures of interspecific species‘Jinyan's are more similar with A. eriantha(maternal parent),and‘Jin-yan'has heavier fruit weight than A. eriantha(maternal parent). Furthermore,'Jinyan'has lower acidcontent than the its parents,which indicates typical heterobeltiosis.