Effects of GA3 and CPPU applications on growth and quality of seedless fruits in triploid loquat [Eriobotrya japonica]
2006
Yahata, S.(Chiba-ken. Agriculture Research Center, Tateyama (Japan)) | Miwa, M. | Sato, S. | Ohara, H. | Matsui, H.
To produce seedless loquat fruits, the effects of GA3 and CPPU applications on growth and quality of seedless fruits in the triploid loquat "Tanaka" strain were investigated. The triploid seedless fruits equal in weight to that of ordinary fruits with seeds grown on diploid "Tanaka" were produced at harvest time by dipping flower and fruit clusters in an aqueous solution of 200 ppm GA3+20 ppm CPPU twice, at flowering time (the first treatment) and between 27 to 58 days after the first treatment (the second treatment). However, the annual concentration of soluble solids in triploid loquat seedless fruits was lower than that of diploid loquat fruits with seeds. The triploid seedless fruits had a longer shape and higher fruit shape index (fruit length/fruit width) than diploid fruits with seeds. The tissue size of the enlarged calyx base and the internal space of the calyx tube of triploid seedless fruits increased to about 2 times as large as those of diploid seeded fruits, in addition, the locule size of the seedless fruits was slightly longer than 1 cm in diameter. However, the locule was only 7% of total volume of the seedless fruits. Flesh thickness at the equator of the seedless fruits grew to about 2 times that of fruits with seeds, the flesh weight increased by approximately 20%, and the edible portion increased to 90% of total weight of the seedless fruits. The increase in flesh thickness resulted from both cell division and cell enlargement.
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