10 research outputs found
Recommended from our members
Identification of QTLs for relative root traits associated with phosphorus efficiency in two culture systems in Brassica napus
Modifications of root system morphology and architecture are considered important strategies of plant tolerance to phosphorus (P) deficiency. However, the effect of culture system on the responses of root traits to P deficiency is not well documented. In this study, the responses of root traits to P deficiency were recorded in a Brassica napus double haploid (DH) population consisting of 182 lines derived from a cross between cultivar âTapidorâ and âNingyou 7â using an âagarâ system and a âpouch and wickâ system. Under P deficient conditions, more DH lines had greater total root length, primary root length, total lateral root length, mean lateral root length and less lateral root density in the âpouch and wickâ system than the âagarâ system. Ten and two quantitative trait loci (QTLs) were detected for the relative root traits in the âagarâ system and the âpouch and wickâ system, respectively. The QTL for the same trait in the âagarâ system did not overlap with that in the âpouch and wickâ system. Two and one QTL clusters identified in the âagarâ system were located on chromosome A09 (Cluster1 and Cluster2) and C04 (Cluster3), respectively. RLRN_A04b, RSDW_A09a and Cluster1 were found to affect the seed yield and/or yield-related traits in two field trials. Overall, this study demonstrated a significant impact of different culture systems on the responses of root traits to P deficiency and on the detection of QTLs for the relative root traits, and identified three major QTLs that could be employed for marker assisted selection of P efficient cultivars