Sink Change Affects Vegetative and Generative Growth of Papaya
Date Issued
2011
Date
2011
Author(s)
Hung, I-Hsuan
Abstract
Floral sex variation of papaya (Carica papaya L.) is quite often happened on hermaphrodite papaya trees. It causes discontinuously fruit setting and results yields instability and the reduction of yield. The degree of the flower sexual change is dependent upon papaya variety, environment and the interaction of both effects on plant physiology. In the field studies, we examined the possibilities to decrease discontinuously fruit setting by different degree thinning fruits and flowers to affect the vegetative and generative growth of hermaphrodite papayas of ‘Tainung No.2’ cultivar.
Papaya planted in net house at Liugui district, Kaohsiung city, which has been grown 13-month-old. Fruit setting failure often occurred after trees having setting 50 fruit nodes, and there were happening 20 nodes without fruit set. Fruit thinning is used to manipulate the source-sink ratio, less sink competition might provide more resource to supply fruit setting and flowering, eventually. Five levels of fruit thinning treatment were practiced including the control, all fruit removal, one, two and three fruits left on every three nodes, respectively. The experiment continually treated with 50 nodes from the beginning fruit setting node. Fruit thinning treatments were significantly effect on decreasing the degree of discontinuous fruit setting; and elongata flower numbers was more dependent on the fruit thinning.
Five defloration treatments were practiced on ‘Tainung No.2’papaya trees. It significantly affected numbers of papaya hermaphrodite flower sexual expression, stem growth and leaf numbers, fruit setting distribution on stem, stress adaptation. The fruits on treatment of removal terminal fruit, and control that have much more fruit load at earlier fruit set period, having more discontinuously fruit setting nodes, and were affected plant survival rate and cause yield loss in the study. However, the removal 1st or 2st peduncle flowers and remain terminal flower of main axial promote papaya trees more yield and longevity.
Subjects
fruit thinning
defloration
elongata flower
fruit set
sterile skipping
floral sexual variation
Type
thesis
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