Involvement of cell proliferation and cell enlargement in increasing the fruit size of Malus species |
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| Institution: | 1. Department of Agriculture and Life Science, Hirosaki University, Hirosaki 036-8561, Japan;2. Institute for Environmental Science, Rokkasho 039-3212, Japan;3. National Institute of Agrobiological Science, Tsukuba 305-8602, Japan;4. Division of Breeding, Aomori Apple Experimental Station, Kuroishi 036-0332, Japan;1. Horticulture Section School of Integrative Plant Sciences, Cornell AgriTech, Cornell University, Geneva, NY, USA;2. IRTA Fruitcentre, PCiTAL, Park of Gardeny, Fruitcentre Building, Lleida, Spain;3. Dept. of Agronomic Sciences, Universidad de Chile, Santiago, Chile;1. Faculty of Agriculture and Life Science, University of Maribor, SI, Slovenia;2. Horticulture and Product Physiology, Wageningen University, NL, Netherlands;1. Universidade do Estado de Santa Catarina, Centro de Ciências Agroveterinárias, Av. Luiz de Camões, 2090, Lages, SC, CEP 88520-000, Brazil;2. Department of Plant Sciences, University of California, Davis, CA, USA |
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| Abstract: | Cell number and cell size in the fruit flesh of five Malus cultivars (two crabapples and three domesticated apples) were analyzed from soon after blossom until maturity. M. floribunda, whose fruit size is one of the smallest among Malus, exhibited absence of cell proliferation throughout fruit ontogeny. Furthermore, the rate of cell enlargement, which was almost uniform until the mature stage in other species, slowed down from about 45 days after full blossom (DAFB), resulting in a cell size approximately half that of the other cultivars. The fruit of M. coronaria, which is of medium size, possessed approximately half the cell number of M. domestica cv. ‘Fuji’, due to a slower proliferation rate. The cv. ‘Sekaiichi’ of M. domestica had the largest fruit among the cultivars investigated, and showed a faster increase in cell number. These results indicate that a combination of greater cell division capacity and an enhanced degree of cell enlargement are involved in the increase of Malus fruit size. |
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