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The influence of floodwater dissolved O 2  content on stem lenticel hypertrophy and endogenous ethylene evolution from mango trees, and the influence of exogenous ethylene on mango stem lenticel hypertrophy was examined. In general, floodwater O 2  contents of 1-7 ppm resulted in lenticel hypertrophy within about 6 days of flooding, whereas floodwater O 2  contents of 15 ppm delayed hypertrophy until about day 9. After 14 days of flooding, there were more than twice the number of hypertrophied lenticels per tree with floodwater O 2  contents of 1-7 ppm than with O 2  contents of 15 ppm. Ethylene evolution from aerobic stem tissue increased 4- to 8-fold in trees exposed to floodwater with 1-2 ppm O 2 , increased 2-fold for trees exposed to 6-7 ppm O 2 , but remained constant with 15 ppm floodwater dissolved O 2  content. During a 10-day flooding period, trees in floodwater with 15 ppm dissolved O 2  content, and given exogenous ethylene, developed extensive stem lenticel hypertrophy, whereas no hypertrophy developed on stems of trees receiving no exogenous ethylene and maintained in floodwater with 15 ppm O 2 . These data suggest that ethylene plays a role in promoting stem lenticel hypertrophy in flooded mango trees.

FLOODWATER OXYGEN CONTENT, ETHYLENE PRODUCTION AND LENTICEL HYPERTROPHY IN FLOODED MANGO TREES