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KMID : 0903619910320040478
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Journal of the Korean Society for Horticultural Science
1991 Volume.32 No. 4 p.478 ~ p.483
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Fruit Resistance to Gas Diffusion of Mature ´ McIntosh ´ Apples in Relation to Lenticel Anatomy
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Abstract
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Four types of lenticels on mature ´McIntosh´ apples (Malus domestica Borkh) had different porosity. An average of 42 percent of lenticels was open to gas exchange, and open lenticels tended to be larger than closed lenticels. Lenticel opening seemed to be caused by the rupture of the epidermal layer after the completion of differentiation. As apples matured and ripened on the tree with a decrease in fruit resistance to gas diffusion, frequency of more differentiated lenticels increased. However, skin permeability to gas diffusion of individual apples seemed not to be closely associated with the frequency of specific lenticel types or the dimension of lenticels suggesting that fruit resistance to gas diffusion might be determined by the porosity of individual lenticels. Scanning electron microscopy (SEM) showed that most lenticel area was covered with waxy material, and only small portion of the area could be used for gas exchange.
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