EXPRESSION OF 3 MEMBERS OF THE ACC SYNTHASE GENE FAMILY IN DEEP-WATERRICE BY SUBMERGENCE, WOUNDING AND HORMONAL TREATMENTS

Ethylene plays a key role in the rapid elongation of deepwater rice. W e cloned cDNAs corresponding to at least three members of the 1-aminoc yclopropane-1-carboxylate (ACC) synthase gene family of deepwater rice (Oryza sativa cv. Plai Ngam). Genomic DNA gel blot analysis confirmed the presence of a multigene family. Expression patterns were studied by Northern blot on poly(A(+)) RNA prepared from plants exposed to abs cisic acid, ACC, gibberellic acid (GA), indole-3-acetic acid, jasmonic acid, submergence and wounding. The mRNA levels were suppressed by AC C, GA, submergence and wounding, but remained relatively constant unde r all other conditions. (C) 1997 Elsevier Science Ireland Ltd.