Survey and evaluation of old mango [Mangifera indica] trees in Ishigaki city, Okinawa [Japan]
2000
Sakihara, K. (Kyushu Tokai Univ., Choyo, Kumamoto (Japan). Faculty of Agriculture) | Ogawa, A. | Kitajima, K. | Nakazato, N. | Kawamitsu, Y. | Tsukayama, H. | Kunitake, H. | Komatsu, H.
Old mango trees in Ishigaki island, Okinawa, Japan were surveyed for three years from October 1997 to June 1999. A total of 13 trees whose trunk diameter at the chest level was over 20 cm were grown own-rooted in the gardens of several private houses. These old trees were supposed to be introduced as seeds or seedlings from Taiwan or Philippines and survived for several decades as a promising clone. Among these 13 trees, two were aged over 50 and recorded as No.1 and No.2. No.1, the oldest, was as tall as 11 m and its trunk diameter at the chest level was 53 cm. The old trees flowered in December one or two months in advance of Irwin, with an exception of No.2 which had a characteristics of ever-flowering. The bunch of No.2 was shorter than of Irwin and its average florets was counted nearly 700. But its fruit set was reliable as compared with the others whose most fruits dropped young and green. The old trees including No.2 were polyembryonic. The fruits of No.2 seemed rather disease resistant and were harvested from April to June as a fruit of 300g with a peel color of light red. The flesh of No.2, though a little fibrous, had a sugar content of 11.5g/100gF.W. with an acid content of 0.25g/100gF.W. From these levels comparable to those of Irwin, No.2 could be rather good quality. The RAPDs followed by a cluster analysis revealed that No.2 was not close to Irwin, but it could be promising for a practical cultivation or as a gene source for new breeding
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