Reference "Quantitative trait loci for phyllochron and tillering in rice"

Reference ID

8329

Title

Quantitative trait loci for phyllochron and tillering in rice

Source

Theoretical and applied genetics, 2004, vol. 109, pp. 700-706

Authors (6)

Miyamoto-N	Goto-Y
Matsui-M	Ukai-Y
Morita-M	Nemoto-K

Abstract

Morphogenetic processes in sequentially growing leaves and tiller buds are
highly synchronized in rice ( Oryza sativa L.). Consequently, the appearance of
successive leaves in the main tiller acts as the 'pacemaker' for the whole shoot
system development. The time interval between the appearance of successive
leaves (days/leaf) in the main tiller is called the 'phyllochron'. The
objectives of the investigation reported here were: (1) to identify quantitative
trait loci (QTLs) that control rice phyllochron and (2) to understand the roles
of phyllochron QTLs as an underlying developmental factor for rice tillering.
For this purpose we developed a set of recombinant inbred lines derived from a
cross between IR36 ( indica) and Genjah Wangkal (tropical japonica). Composite
interval mapping detected three phyllochron QTLs located on chromosomes 4, 10
and 11, where the presence of a Genjah Wangkal allele increased phyllochron. The
largest QTL (on chromosome 4) was located on the genomic region syntenic to the
vicinity of the maize Teopod 2 mutation, while the QTL on chromosome 10 was
close to the rice plastochron 1 mutation. These three phyllochron QTLs failed to
coincide with major tiller number QTLs. However, one tiller number QTL was
associated with small LOD peaks for phyllochron and tiller-bud dormancy that
were linked in coupling phase, suggesting that linked small effects of
phyllochron and tiller-bud dormancy might result in a multiplicative effect on
tiller number.