Abstract
Fusarium wilt, caused by Fusarium oxysporum f. sp. ricini, is the most destructive disease in castor. Host plant resistance is the best strategy for the management of wilt. Identification of molecular markers linked to wilt resistance will enhance the efficiency and effectiveness of breeding for wilt resistance. In the present study, genomic regions linked to wilt resistance were mapped using a bi-parental population of 185 F6-RILs and a genetically diverse panel of 300 germplasm accessions. Quantitative trait loci (QTL) analysis performed using a linkage map consisting of 1090 SNP markers identified a major QTL on chromosome 7 with an LOD score of 18.7, which explained 44% of the phenotypic variance. The association mapping performed using genotypic data from 3465 SNP loci revealed 69 significant associations (p< 1 × 10-4) for wilt resistance. The phenotypic variance explained by the individual SNPs ranged from 0.063 to 0.210. The QTL detected in the bi-parental mapping population was not identified in the association analysis. Thus, the results of this study indicate the possibility of vast gene diversity for Fusarium wilt resistance in castor.
Highlights
Castor (Ricinus communis L.) is an important oilseed crop grown in arid and semi-arid regions of the world
The association mapping population comprised (i) accessions of castor core germplasm set derived from a global collection of over 3000 accessions (Sarada and Anjani 2013), (ii) known germplasm sources for important agronomic traits, (iii) elite inbred lines developed from major castor breeding centers in India, and (iv) varieties and parental lines of hybrids released for cultivation
All the lines of the association mapping panel germinated within 10–12 days, and the germination rate was more than 99%
Summary
Castor (Ricinus communis L.) is an important oilseed crop grown in arid and semi-arid regions of the world. Its oil is an important raw material for several industrial products such as lubricants, soaps, hydraulic brake fluids, surfactants, surface coatings, varnishes, nylon fibers, polymers, dyes, and cosmetic and pharmaceutical preparations (Scarpa and Guerci 1982; Ogunniyi 2006). It is the only species of the genus Ricinus, belonging to the family Euphorbiaceae. Castor is predominantly a monoecious plant having male and female flowers in the same inflorescence called a spike. India ranks first in the area and production of castor and plays a significant role in the international castor oil market. During 2017, castor was cultivated in an area of 0.96 million ha with a production of 1.57 million ton of castor seed in India (FAOSTAT 2019)
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
