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Flooding tolerant and intolerant varieties of Echinochloa crus-galli (Linn.) Beauv. at spikelet germination were studied to determine the oxygen requirement of their fruit germination. Detached fruits of the tolerant and intolerant varieties, formosensis Ohwi and praticola Ohwi, respectively, were found to be able to germinate under flooding or nitrogen atmosphere. However, fruit germination of the intolerant variety was inhibited when the highly lignified second floral lemma were added back to the imbibition medium either under nitrogen or under air along with an antioxidant, dithiothreitol. These results suggest that the floral lemma of praticola contain an agent (s) which inhibits fruit germination under a reduced state, but is readily inactivated by oxidation.

Floral Lemma Responsible for Oxygen Requirement of Flooding-intolerant Spikelet Germination in Echinochloa crus-galli var. praticola Ohwi.