Thesis (Ph. D.)--University of Wisconsin--Madison, 1944. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 67-71).

Synthetic auxin, naphthaleneacetic acid ( NAA ), promoted rooting in soybean ( Glycine max ) hypocotyls. The activities of anionic peroxidases (PODs, pI 3.5 and pI 3.7 ) and cationic PODs ( pI 8.3, pI 9.1 and pI 9.4 ) in soybean hypocotyls were significantly inhibited by exogenous NAA during the induction of adventitious roots. In addition, the reduction in the activity of PODs ( pI 4.4, pI 8.3 and pI 9.4 ) were correlated with a reduction of their corresponding transcription activity. The PODs patterns and transcription in the NAA-treated hypocotyls demonstrated the specific effect of NAA on POD ioszymes, indicating that NAA might suppress PODs genes expression during the adventitious root formation. The decline of PODs activity in the NAA-treated hypocotyls was accompanied by the decrease of lignin contents. We suggest that both of anionic and cationic PODs might be in part responsible for lignin synthesis in soybean hypocotyls.