Fruit growth and quality as affected by presence of neck and leaf numbers of leafy floral shoot in 'Shiranuhi' ([Citrus unshiu Marc. x C. sinensis Osb.] x C. reticulata Blanco) trees
2009
Matsuoka, S., Ehime Univ., Matsuyama (Japan). Faculty of Agriculture | Ikeda, K. | Sawa, H. | Sogabe, M. | Takeda, Y. | Fukumoto, E. | Fujii, S. | Minami, M. | Mizutani, F.
By using mature trees of 'Shiranuhi' ([Citrus unshiu Marc. x C. sinensis Osb.] x C. reticulata Blanco), effects of presence of fruit neck (collar) and leaf numbers (zero to six) of leafy floral shoots on fruit growth and quality (Brix, titratable acidity) were examined. The presence or absence of neck did not affect fruit growth pattern in terms of length or diameter or fruit shape index. Although statistically not different, non-neckfruit tended to have the greater Brix/acid ratio than necked fruit. Fruit growth in terms of diameter was greatest in fruit with two leaves on the shoot. On the other hand, fruit growth in terms of length was least in fruit with six leaves. Fruit shape index (length/diameter) was greatest in non-leafy fruit and smallest in fruit with six leaves. With increasing leaf numbers, fruit weight and citric acid content peaked in fruit with two leaves followed by decline. The reverse tendency was apparent in Brix, sugar/acid ratio and final fruit set. Thus leaf area equivalent to two leaves on leafy floral shoots is likely to have a critical significance in fruit physiology in relation to fruit growth and harvested fruit quality.
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