PHYSIOLOGICAL, MORPHOLOGICAL, AND GROWTH RESPONSES OF MANGO TREES TO FLOODING
The effect of flooding on leaf gas exchange, vegetative growth, and stem lenticel hypertrophy of container-grown 'Tommy Atkins' mango (Mangifera indica L.) trees on two rootstocks, and of container-grown seedling 'Peach' mango trees were investigated. Flooding resulted in reductions in net CO2 assimilation (A) and stomatal conductance (gs), and increased substomatal CO2 concentration (Cj) within 2–3 days. For trees flooded for 14 days, approximately two months were required for net gas exchange to recover to pre-flood rates. Flooding reduced root growth, resulting in increased shoot:root ratios for flooded trees. Mortality of flooded trees ranged from 0 to 45%, and was not related to rootstock/scion combination. Survival under flooded soil conditions appeared related to the development of hypertrophied stem lenticels, in that trees that did not form hypertrophied lenticels died within several days of flooding. Stem lenticel hypertrophy was temperature dependent, developing within five days at 30 C, 6 days at 22.5 C, and not developing at 15 C. Stem lenticel hypertrophy was also affected by floodwater dissolved O2 content, developing more rapidly at floodwater O2 contents of 1–7 ppm than at 13–15 ppm. The results of these experiments indicate that although mango is not a highly flood-tolerant crop, it appears to possess certain adaptations to flooded soil conditions.
Larson, K.D., Schaffer, B. and Davies, F.S. (1993). PHYSIOLOGICAL, MORPHOLOGICAL, AND GROWTH RESPONSES OF MANGO TREES TO FLOODING. Acta Hortic. 341, 152-159
anaerobiosis, net gas exchange, lenticel hypertrophy, Mangifera indica L.