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- 저자 : Yazdan Gholi Khazaeipoul (검색결과 1 건)
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Improving Fruit Quality in ‘Hayward’ Kiwifruit Using Proper Leaf to Fruit Ratios and Girdling
Pedram Assar,Saeid Eshghi,Enayatollah Tafazoli,Majid Rahemi,Yazdan Gholi Khazaeipoul,Abbas Saboorrooh Monfared 한국원예학회 2009 Horticulture, Environment, and Biotechnology Vol.50 No.6
The effects of different leaf to fruit ratios, summer pruning time, and girdling on quantitative and qualitative characteristics of ‘Hayward’ kiwifruit were examined. On each vine, four uniform canes were selected and by pruning their fruiting laterals, leaf to fruit ratio was adjusted and maintained at 1:1, 2:1, 3:1, or 4:1. In control treatment, these selected canes were left intact without topping and removing any lateral growth. Half of the selected canes were girdled by removing a 5 mm strip of bark around the base of each cane, while the other half were left intact. Leaf to fruit adjustment and girdling were imposed 2 weeks after petal fall. To show how pruning time can affect fruit characteristics of the four mentioned selected canes, other canes and their laterals in each vine were pruned early (similar to selected canes) or late (in late summer) (vine general pruning methods A and B, respectively). In both methods, pruning manner was in accordance with common practice in Persian commercial orchards (heading cuts were performed after 3-4 leaves distal to the latest fruit). Finally, fruits of selected canes were harvested and analyzed. Results indicated the necessity of summer pruning performance to obtain fruits with higher quality. The importance of total leaf numbers of laterals in each cane as carbohydrate suppliers for fruits in order to support potential fruit growth was proved. Also, dependence of fruit growth in each cane on carbohydrate supply of other canes was detected. In pruned vines in method A (early summer pruned and as a result having light canopies with optimum light penetration) on girdled experimental canes, minimum leaf to fruit ratio that was required to achieve significant changes in fruit quantitative characteristics compared with control, was 1:1 for width and weight and 2:1 for length and volume. The positive effect of girdling on fruit quantitative characteristics via improving the available photosynthates supply to developing fruits was confirmed. Smaller responses of fruit growth to increasing the leaf to fruit ratios on non-girdled canes due to competition for photosynthate from other sinks, was observed. In pruned vines in method A (better canopy conditions), girdling performance combined with 3:1 and 4:1 leaf to fruit ratios resulted in higher vitamin C and total soluble solids contents, respectively. The positive effect of on time (early) summer pruning on fruit characteristics was proved.
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