Abstract
Flooding of alfalfa plants (3 wk old), resistant (A77-10B) and susceptible (Moapa 69) toPhytophthora megasperma f. sp.,medicaginis (Pmm) for 4-days caused an increase in length (2 cm) of tap roots, cessation of secondary growth, suppression of lateral root growth, and formation of aerenchyma channels in the stele and hypertrophied lenticels, which extended to the stele, on taproots. In soil containing plants from which foliage had been clipped, flooding induced a decrease in O2 from 21 to 2% by the second day, and caused death of plants. In soil containing intact unclipped plants flooding induced a slight decrease in O2 to 15 to 17% which returned to normal by the fourth day.
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