Ubiquitination in Abscisic Acid-Related Pathway Cloning and Sequence Analysis of Ubiquitin-conjugating Enzyme Gene from Wild Carex duriuscula Characterization of a Novel Ubiquitin-conjugating Enzyme from Camellia oleifera Cloning and Analysis on Full-length cDNA Sequence of Ubiquitin-conjugating Enzyme Gene from Oryza meyeriana Baill.