Reference "Suppression of tiller bud activity in tillering dwarf mutants of rice"

Reference ID

11473

Title

Suppression of tiller bud activity in tillering dwarf mutants of rice

Source

Plant & cell physiology, 2005, vol. 46, pp. 79-86

Authors (6)

Ishikawa-S	Maekawa-M
Arite-T	Onishi-K
Takamure-I	Kyozuka-J

Abstract

In this study, we analyzed five tillering dwarf mutants that exhibit reduction
of plant stature and an increase in tiller numbers. We show that, in the
mutants, axillary meristems are normally established but the suppression of
tiller bud activity is weakened. The phenotypes of tillering dwarf mutants
suggest that they play roles in the control of tiller bud dormancy to suppress
bud activity. However, tillering dwarf mutants show the dependence of both node
position and planting density on their growth, which implies that the functions
of tillering dwarf genes are independent of the developmental and environmental
control of bud activity. Map-based cloning of the D3 gene revealed that it
encodes an F-box leucine-trich repeat (LRR) protein orthologous to Arabidopsis
MAX2/ORE9. This indicates the conservation of mechanisms controlling axillary
bud activity between monocots and eudicots. We suggest that tillering dwarf
mutants are suitable for the study of bud activity control in rice and believe
that future molecular and genetic studies using them may enable significant
progress in understanding the control of tillering and shoot branching.