Effect of Artificial Defoliation on Cane Regrowth and Fruit Development in ‘Jecy Gold’ Kiwifruit

다국어 초록 (Multilingual Abstract)

Leaves of kiwifruit have long petiole and large size, so that they are easily damaged by strong wind. This study was performed to evaluate the effect of leaves loss by typhoon damage on fruit quality and yield and new cane growth with artificial defoliation. Five-year-old ‘Jecy Gold’ kiwifruit vines grown in a plastic house were used in this study. Artificial defoliation was done on August 23 (100 days after anthesis) at the different defoliation levels, such as 0 (control), 50, 75, and 100%. Cane regrowth by axillary bud burst, cane bark carbohydrate reserve, and fruit quality and yield were investigated. Severe defoliation at 75 and 100% level showed significantly higher axillary budburst than the control and the 50% defoliation. Especially, the 100% defoliation induced a few abnormal off-season flowering. Starch and sucrose contents were significantly declined during the first 2 weeks after defoliation at the 75 and 100% defoliation. However, other soluble carbohydrate reserves including fructose, glucose, and myo-inositol were not affected significantly. Fruit drop was promoted and the mean fruit weight, firmness, and soluble solid concentrations were lower by the defoliation. Our results indicated that the loss of leaves above 50% would induce a transient shortage of assimilate supply and reduce fruit quality and yield significantly.

참고문헌 (Reference)

1 곽용범, "조기낙엽이 참다래 ‘헤이워드’ 과실 바람들이와 품질에 미치는 영향" 한국환경농학회 31 (31): 229-234, 2012

2 곽용범, "조기낙엽에 따른 참다래(골드러쉬) 무착과 유목 액아의 발아와 착화" 한국환경농학회 32 (32): 201-206, 2013

3 Hunter, J.J., "The effect of partial defoliation on growth characteristics of Vitis vinefera L. cv. Cabernet Sauvignon I vegetative growth" 11 : 18-25, 1990

4 Piller, G.J., "The acquisition and utilization of carbon in early spring by kiwifruit shoots" 79 : 573-581, 1997

5 Analytical Software, "Statistix® 8"

6 Boldingh, H., "Seasonal concentrations of non-structural carbohydrates of five Actinidia species in fruits, leaf, and fine root tissue" 85 : 469-476, 2000

7 Loveys, B.R., "Seasonal and diurnal changes in abscisic acid and water relations of apricot leaves (Prunus armeniaca L.)" 107 : 15-27, 1987

8 Smith, G.S., "Seasonal accumulation of starch by components of the kiwifruit vine" 70 : 19-25, 1992

9 Magel, E, "Qualitative and quantitative determination of starch by a colorimetric method" 43 : 384-387, 1991

10 Salinero, M.C., "Phenological growth stages of kiwifruit (Actinidia deliciosa ‘Hayward’)" 121 : 27-31, 2009

11 Pospisilova, J., "Participation of phytohormones in the stomatal regulation of gas exchange during water stress" 36 : 491-506, 2003

12 Cui, M., "Isolation and developmental expression analysis of L-myo-inositol-1-phosphate synthase in four Actinidia species" 73 : 351-358, 2013

13 Buwalda, J.G., "Effects of partial defoliation at various stages of the growing season on fruit yields, root growth and return bloom of kiwifruit vines" 42 : 29-44, 1990

14 Brundell, D. J., "Effect of defoliation, shading, and tipping of shoots on flower bud development and vegetative growth of Chinese gooseberry (Actinidia chinensis Planch.)" 18 : 365-370, 1975

15 Cruz-Castillo, J. G., "Effect of defoliation on fruit growth, carbohydrate reserves, and subsequent flowering of ‘Hayward’ kiwifruit vines" 125 : 579-583, 2010

16 Mehouachi, J., "Defoliation increases fruit abscission and reduces carbohydrate levels in developing fruits and woody tissues of Citrus unshiu" 107 : 189-197, 1995