Identification of QTL controlling root growth response to phosphate starvation in Arabidopsis thaliana
Identification of QTL controlling root growth response to phosphate starvation in Arabidopsis thaliana
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DOI：
10.1111/j.1365-3040.2005.01405.x
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发表时间：
2006-01-01
影响因子：
7.3
通讯作者：
Desnos, T
中科院分区：
文献类型：
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作者：
Reymond, M;Svistoonoff, S;Desnos, T
植物对外源低磷的反应之一是改变根构型。在低磷条件下生长的拟南芥幼苗中，主根长度（PRL）减少，而侧根生长促进。通过使用湾-0 × Shahdara重组自交系（RIL）的人口，我们已经绘制了三个数量性状位点（QTL）参与根生长反应低P。在这三个QTL的Shahdara等位基因促进反应的主根低P（即根长减少）。其中一个QTL LPR 1位于第1号染色体顶端的2.8 Mb区域，解释了PRL变异的52%。我们还检测到一个单一的QTL与主根细胞伸长响应低P共定位与LPR 1。LPR 1似乎不参与其他典型的P-饥饿反应，如根毛的生长和密度，酸性磷酸酶的分泌，花青素积累或P转运蛋白Pht 1的转录诱导;4. LPR 1可能会突出新的方面的根生长，特别是在低磷条件下揭示。
One of the responses of plants to low sources of external phosphorus (P) is to modify root architecture. In Arabidopsis thaliana plantlets grown on low P, the primary root length (PRL) is reduced whereas lateral root growth is promoted. By using the Bay-0 x Shahdara recombinant inbred line (RIL) population, we have mapped three quantitative trait loci (QTL) involved in the root growth response to low P. The Shahdara alleles at these three QTL promote the response of the primary root to low P (i.e. root length reduction). One of these QTL, LPR1, located in a 2.8 Mb region at the top of chromosome 1, explains 52% of the variance of the PRL. We also detected a single QTL associated with primary root cell elongation in response to low P which colocalizes with LPR1. LPR1 does not seem to be involved in other typical P-starvation responses such as growth and density of root hairs, excretion of acid phosphatases, anthocyanin accumulation or the transcriptional induction of the P transporter Pht1;4. LPR1 might highlight new aspects of root growth that are revealed specifically under low P conditions.