PLANT PHYSIOLOGY , Vol 113, Issue 2 631-637, Copyright © 1997 by American Society of Plant Biologists
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DEVELOPMENT AND GROWTH REGULATION |
The Control of Apical Bud Growth and Senescence by Auxin and Gibberellin in Genetic Lines of Peas
Y. X. Zhu and P. J. Davies
Section of Plant Biology, Plant Science Building, Cornell University, Ithaca, New York 14853
Pea (Pisum sativum L.) lines G2 (dwarf) and NGB1769 (tall) (Sn Hr) produce
flowers and fruit under long (LD) or short (SD) days, but senesce only
under LD. Endogenous gibberellin (GA) levels were inversely correlated with
photoperiod (over 9-18 h) and senescence: GA20 was 3-fold and GA1 was 10-
to 11-fold higher in flowering SD G2 shoots, and the vegetative tissues
within the SD apical bud contained 4-fold higher levels of GA20, as
compared with the LD tissues. Prefloral G2 plants under both photoperiods
had GA1 and GA20 levels similar to the flowering plants under LD. Levels of
indole-3-acetic acid (IAA) were similar in G2 shoots in LD or SD; SD apical
bud vegetative tissues had a slightly higher IAA content. Young floral buds
from LD plants had twice as much IAA as under SD. In NGB1769 shoots GA1
decreased after flower initiation only under LD, which correlated with the
decreased growth potential. We suggest that the higher GA1 content of G2
and NGB1769 plants under SD conditions is responsible for the extended
vegetative growth and continued meristematic activity in the shoot apex.
This and the increased IAA level of LD floral buds may play a role in the
regulation of nutrient partitioning, since more photosynthate partitions of
reproductive tissue under LD conditions, and the rate of reproductive
development in LD peas is faster than under SD.
