Identification of quantitative trait loci affecting tolerance to low phosphorus in rice (Oryza Sativa L.) |
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Authors: | Feng Ming Xianwu Zheng Guohua Mi Ping He Lihuang Zhu Fusuo Zhang |
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Institution: | (1) Plant Nutrition Department of China Agricultural University, 100094 Beijing, China;(2) Institute of Genetics, Chinese Academy of Sciences, 100101 Beijing, China |
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Abstract: | Phosphorus (P)-deficiency in rice (Oryza. Sativa. L) may cause yield reductions. This research has been conducted to map quantitative trait loci (QTLs) for tolerance to low
phosphorus stress in a doubled haploid (DH) population. By using the linkage map of this population, the QTLs for relative
dry weight, relative P content and relative P utilization efficiency have been located. The results indicate that one RFLP
marker located on chromosome 6 is closely associated with relative root dry weight, relative shoot dry weight and relative
total dry weight, which explain 24.9%, 20.5% and 25.2% of the total phenotypic variations, respectively. Two QTLs affect relative
P uptake content, which account for 20.7% of the total phenotypic variations. One micro-effect QTL has been found to be associated
with relative P utilization efficiency. It is suggested that the P uptake efficiency is more associated with P efficiency.
Among the secondary physiological indices of P uptake efficiency, the root dry weight is more important than others. |
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Keywords: | rice phosphorus deficiency molecular marker dry weight phosphorus uptake content phosphorus utilization efficiency |
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