Abstract
Brassica napus (Brassicaceae) is among the most important oil crops and a promising biofuel. In the tropics and subtropics, boron (B) deficiency is a major factor limiting Brassica yields. The effect of B on the regulation of root and shoot growth in a doubled haploid (DH) population was evaluated in experiments that utilized hydroponic culture. Strong genetic variability for traits of interest at normal and low B concentrations was demonstrated. Quantitative trait loci (QTL) were analyzed for seven plant growth parameters: increment of primary root length (IPRL), shoot dry weight (SDW), root dry weight (RDW), ratio of RDW to SDW (R/S), shoot B accumulation (SBA), root B accumulation (RBA), and ratio of RBA to SBA [(R/S)BA] in the population. Twenty-seven QTL were detected at normal B levels: four for IPRL, seven for SDW, three for RDW, two for R/S, six for SBA, two for RBA, and three for (R/S)BA. At low B, 18 QTL were detected: four for IPRL, three for SDW, two for RDW, two for R/S, five for SBA, one for RBA, and one for (R/S)BA. Three QTL for adaptability were detected: one A_IPRL and two A_SDW. No putative QTL was detected at both low and normal B. B-related genes were mapped in silico and their locations compared with the QTL identified. The present analyses show the profound and varied effects of B on B. napus and studies on QTL related to B efficiency will help to locate candidate genes and elucidate possible functions of B-efficiency-related QTL.
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Acknowledgments
We greatly acknowledge the efforts of Gautam Mayank and Genedits (Genedits: www.genedits.com) in reading and editing the English version of the manuscript. This work was supported by grants from the National Basic Research Program of China (973 program) (2011CB109302), National Natural Science Foundation of China (31172018) and the Fundamental Research Funds for the Central Universities (2011PY150).
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Shi, L., Yang, J., Liu, J. et al. Identification of quantitative trait loci associated with low boron stress that regulate root and shoot growth in Brassica napus seedlings. Mol Breeding 30, 393–406 (2012). https://doi.org/10.1007/s11032-011-9629-z
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DOI: https://doi.org/10.1007/s11032-011-9629-z