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GrainGenes Reference Report: TAG-109-700

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Reference	TAG-109-700
Title	Quantitative trait loci for phyllochron and tillering in rice
Journal	Theoretical and Applied Genetics
Volume	109
Pages	700-706
Author	Miyamoto N [ Show all 6 ]
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
Keyword	[ Hide all but 1 of 22 ] chromosome mapping chromosomes crossing cultivars dormancy gene segregation genetic markers inbred lines leaf development leaves linkage (genetics) loci microsatellite repeats mutation oryza sativa quantitative trait loci restriction fragment length polymorphism rice temporal variation tiller bud dormancy tiller number tillering

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