ISHS Acta Horticulturae 275: International Symposium on the Culture of Subtropical and Tropical Fruits and Crops
EFFECT OF TEMPERATURE ON STARCH ACCUMULATION IN TRUNKS AND ROOTS OF MANGO (MANGIFERA INDICA L.) CULTIVARS |
| Authors: | A.W. Whiley, T.S. Rasmussen, J.B. Saranah, B.N. Wolstenholme |
| Abstract:
Mango [Mangifera indica L.] cvs of tropical and subtropical origin, viz. Carabao, Kensington, Glenn, Haden and Irwin, grafted onto cv Kensington seedling rootstock, were grown in sunlit growth rooms at different temperatures. In the first of two experiments trees were held for 20 weeks at four day/night temperature regimes of 15/10°C, 20/15°C, 25/20°C and 30/25°C. In the second experiment trees were grown for 0,2,4,6,8,10 and 12 weeks at 20/10°C and then returned to the control temperature of 30/20°C. Temperature affected the concentration of starch in woody tissues of rootstock trunks in both experiments. In the first experiment at the end of 20 weeks starch concentration was 15.9% of dry weight at 15/10°C v. 4.8% of dry weight at 30/25°C. 'Irwin' had the highest starch concentration at the two higher temperature regimes (x2 of any other cultivar at 20/10°C) while 'Kensington' had the lowest starch level at 25/20°C, c. 50% of most other cultivars. In the second experiment trunk starch concentrations increased sharply once trees were placed in rooms at 20/10°C, viz. by c. 300% after 2 weeks and c. 600% after 12 weeks compared to the control trees held at 30/20°C. | |
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