MSU-DOE Plant Research Laboratory, Michigan State University, East Lansing, Michigan 48824.
Plant Physiol. 1978 Sep;62(3):397-401. doi: 10.1104/pp.62.3.397.
Selenomethionine and selenoethionine enhanced ethylene production in senescing flower tissue of Ipomoea tricolor Cav. and in auxin-treated pea (Pisum sativum L.) stem sections. This enhancement was fully inhibited by the aminoethoxy analog of rhizobitoxine. Methionine did not have a comparable promotive effect, and ethionine partly inhibited ethylene production. When [(14)C]methionine was applied to flower or pea stem tissue followed by treatment with unlabeled selenomethionine or selenoethionine, the specific radioactivity of the ethylene evolved was considerably reduced. The dilution of the specific radioactivity of ethylene by selenomethionine, and in pea stem sections also by selenoethionine, was greater than the dilution by nonradioactive methionine at the same concentration. These results indicate that both selenoamino acids serve as precursors of ethylene and that they are converted to ethylene more efficiently than is methionine.
硒代蛋氨酸和硒代乙硫氨酸增强了三色牵牛（Ipomoea tricolor Cav.）衰老花组织和生长素处理的豌豆（Pisum sativum L.）茎段中的乙烯生成。这种增强作用被根瘤菌素氨基乙氧基类似物完全抑制。蛋氨酸没有类似的促进作用，而乙硫氨酸部分抑制乙烯生成。当将 [(14)C]蛋氨酸应用于花或豌豆茎组织，然后用未标记的硒代蛋氨酸或硒代乙硫氨酸处理时，释放的乙烯的比放射性显著降低。硒代蛋氨酸和豌豆茎段中的硒代乙硫氨酸使乙烯的比放射性稀释程度大于相同浓度下非放射性蛋氨酸的稀释程度。这些结果表明，这两种含硒氨基酸都可以作为乙烯的前体，并且它们比蛋氨酸更有效地转化为乙烯。
