Sf. Ding et al., Changes in free and conjugated indole-3-acetic acid during early stage of flower bud differentiation in Polianthes tuberosa, PL PHYS BIO, 37(2), 1999, pp. 161-165
Tuberose (Polianthes tuberosa L. cv. Double) corms at the vegetative, early
floral initiation, and flower bud differ entiation stages were assayed for
free indole-3-acetic acid (IAA), esterified IAA, and peptidyl IAA. The cor
ms in the vegetative stage contained higher free IAA than those from the ea
rly floral initiation stage. Free IAA in corm tissues increased 2.7-fold at
flower bud differentiation as compared to the vegetative stage. In the veg
etative coons, a marked promotion of leaf differentiation was recorded. In
contrast, corms from the early floral initiation stage contained less free
IAA, whereas esterified IAA and peptidyl IAA increased dramatically. It is
concluded that the level of free IAA in vegetative corms is correlated with
leaf differentiation, and that the early floral initiation stage is correl
ated with a reduction in free IAA and an increase in IAA conjugates in the
corms. Moreover, increases in free IAA and decreases in IAA conjugates in t
he floral differentiation stager as compared to the early floral initiation
stage, indicates that free IAA is correlated with newer development. (C) E
lsevier, Paris.