Effects of temperature on starch accumulation in trunks and roots of mango (Mangifera indica L.) cultivars.
Whiley A. W., Rasmussen T. S., Saranah J. B., Wolstenholme B. N.
Author Affiliation: Maroochy Horticultural Research Station, DPI, PO Box 5083, SCMC, Nambour, Qld 4560, Australia.
Acta Horticulturae : 145-152
Abstract : The cultivars Carabao and Kensington from the polyembryonic group and Glenn, Haden and Irwin which are monoembryonic were held at 4 day/night temperature regimes, viz. 15/10, 20/15, 25/20 and 30/25°C for 20 weeks. In a second experiment, Carabao, Kensington and Irwin were grown for 0, 2, 4, 6, 8, 10 or 12 weeks at 20/10° and then returned to the control temperature of 30/20°. The concentration of starch in the rootstock trunk was affected in both experiments. In the first experiment, there was 15.9% starch DW in the 15/10° regime compared with 4.8% at 30/25°. Irwin had the highest content (13.1%) at the 2 higher regimes. Kensington had the lowest levels (6.4%) at 25/20°. There was little difference between cultivars at the 2 lower levels. In the second experiment, starch content increased when the trees were placed in the 20/10° regime, by 300% after 2 weeks and 600% after 12 weeks, compared with the control trees held at 30/20°. Carabao accumulated less starch than the other cultivars.