Scientific Reports of the Faculty of Agriculture, Okayama University
Published by the Faculty of Agriculture, Okayama University
ONLINE ISSN : 2186-7755

カキ果実の生長第3期における呼吸上昇と果実の肥大・成熟との関連について

Abstract
Fruit growth of persimmon follows a double sigmoidal curve.With the oneset of growth stage Ⅲ,fuit srart their final swell and enter the maturation phase.We investigated the seasonal changes in respiration rates of persimmon fruit in the field condition,and discovered that fuit respiration showed a rapid increase with the onset of growth stage Ⅲ.This result indicates a possibility that this respiration rise at growth stage Ⅲ may have a close relationship to final swell and maturation. Since many somata are distributed on the calyx lobes,but not on the fruit surface, the calyx lobes are generally agreedto to 'tbe gas exchanging site'of the fruit.Therefore, by removing the calyx lobes and sealing the scars with Vaseline,we are able to markedly inhibit the respiration rise at growth Ⅲ.As a result,final fruit swell and accumulation of 13C-photoassimilate were visibly reduced.The inhibition of fuit respiration seemed to reduce the sink strength of the fruit,which in turn suppressed fuit gowth.It was concluded that the high respiration during growth stage Ⅲin persimmon fruit is important for maintaining sink strength for the final swell of fruit.Gibberellic acid treatment at growth stage Ⅱor Ⅲ delayed fruit coloring and softenig.On the other hand,abscisic acid treatment at growth stage Ⅱ promoted fruit coloring.In connection with there effects,the respiration rise was retarded by gibberellic acid treatment and advanced abscisic acid treatment.These results suggest that the respiration rise at growth stage Ⅲ may have a close relationship to the maturation of persimmon fruit.During the period when the fruit respirant rise at growth stage Ⅲ was observed, ethylene production rates showed no changes.This suggests that ethylene has no relation to the respiration rise and that the respiration rise is different from that in climacteric fuit.
Keywords
persimmon
Doispyros kaki
respiration
fruit growth
ripening
ISSN
0474-0254
NCID
AN00033029