Floodwater Oxygen Content, Ethylene Production and Lenticel Hypertrophy in Flooded Mango (Mangifera indica L.) Trees |
| |
Authors: | LARSON KIRK D; SCHAFFER BRUCE; DAVIES FREDERICK S |
| |
Abstract: | A system was developed to test the effects of floodwater O2concentration on ethylene evolution and stem lenticel hypertrophy,and the effects of exogenous ethylene on stem lenticel hypertrophyin mango (Mangifera indica L.) trees. Dissolved O2 concentrationsof 17x109 m3 m3 generally resulted in hypertrophyof stem lenticels within about 6 d of flooding, whereas floodwaterO2 concentrations of 1315 x 109 m3 m3 delayedhypertrophy until about day 9. After 14d of flooding, therewere more than twice the number of hypertrophied lenticels pertree with floodwater O2 concentrations of 17 x 109m3 m3 than with floodwater O2 concentrations of 15 x109 m3 m3. Ethylene evolution from stem tissueimmediately above the floodline increased 4- to 8-fold in treesexposed to floodwater O2 concentrations of 12 x 109m3 m3, increased 2-fold for trees exposed to floodwaterO2 concentrations of 67 x 109 m3 m3, butremained constant with floodwater O2 concentrations of 1315x 109 m3 m3. Plants maintained in highly oxygenatedfloodwater (1315 x 109 m3 m3), and givenexogenous ethylene developed many hypertrophied lenticels, whereasplants in highly oxygenated water and not given ethylene developedfewer or nohypertrophied lenticels. These data suggest thatethylene plays a role in promotion of stem lenticel hypertrophyin flooded mango trees, and that floodwater dissolved oxygenconcentration can regulate stem lenticel hypertrophy and ethyleneevolution in this species. Key words: Flooding, hypoxia, hypertrophic cell swelling |
| |
Keywords: | |
本文献已被 Oxford 等数据库收录! |
|