Quantitative trait loci for phyllochron and tillering in rice
Quantitative trait loci for phyllochron and tillering in rice
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DOI：
10.1007/s00122-004-1690-0
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发表时间：
2004-08-01
影响因子：
5.4
通讯作者：
Nemoto, K
中科院分区：
文献类型：
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作者：
Miyamoto, N;Goto, Y;Nemoto, K
水稻（Oryza sativa L.）连续生长的叶片和分蘖芽的形态发生过程是高度同步的。因此，主茎连续叶片的出现是整个茎系统发育的“起搏器”。在主分蘖中连续叶片出现之间的时间间隔（天/叶）被称为“叶时”。本研究的目的是：（1）鉴定控制水稻叶时的数量性状位点（QTL）;（2）了解叶时QTL作为水稻分蘖发育潜在因子的作用。为此目的，我们开发了一套重组自交系来自IR36（籼稻）和Genjah Wangkal（热带粳稻）之间的杂交。复合区间作图检测到3个位于第4、10和11染色体上的叶时QTL，其中Genjah Wangkal等位基因的存在增加了叶时。最大的QTL（位于第4号染色体上）位于玉米Teopod 2突变附近的基因组同线区域，而位于第10号染色体上的QTL靠近水稻质体时线1突变。这3个叶时QTL与主茎数QTL不一致。然而，一个分蘖数QTL与小LOD峰值的叶时和分蘖芽休眠，在耦合阶段，这表明，连接的小影响叶时和分蘖芽休眠可能会导致分蘖数的乘法效应。
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.