EFFECT OF NAPHTHALENEACETIC ACID ON ENDOGENOUS INDOLE-3-ACETIC-ACID, PEROXIDASE AND AUXIN OXIDASE IN HYPOCOTYL CUTTINGS OF SOYBEAN DURING ROOT-FORMATION
Zh. Liu et al., EFFECT OF NAPHTHALENEACETIC ACID ON ENDOGENOUS INDOLE-3-ACETIC-ACID, PEROXIDASE AND AUXIN OXIDASE IN HYPOCOTYL CUTTINGS OF SOYBEAN DURING ROOT-FORMATION, Zhongyang yanjiuyuan. zhiwuxue huikan, 37(4), 1996, pp. 247-253
The effect of exogenous naphthaleneacetic acid (NAA) on the internal l
evels of indole-3-acetic acid (IAA) in rooting hypocotyls of Glycine m
ax was studied. The hypocotyls of NAA-treated cuttings grew significan
tly higher numbers of adventitious roots with an increase in endogenou
s IAA levels that corresponded with a decrease in IAA oxidase activity
(32 kDa) examined. Moreover, a decline of peroxidase activity was acc
ompanied by a decrease of lignin content during root formation. Caffei
c acid and ferulic acid, two critical phenolic compounds for lignin sy
nthesis, accumulated in NAA-treated tissues. Consequently, the increas
ed IAA levels with a decrease of IAA oxidase activity accompanied a lo
wer lignin content and a reduced peroxidase activity in NAA-treated ti
ssues suggests that the induction of adventitious roots by NAA in soyb
ean cuttings may be due to to the higher IAA levels accumulated in tis
sues.