Abstract
A mapping population of recombinant inbred lines (RILs) derived from TMV 2 and its mutant, TMV 2-NLM was employed for mapping important taxonomic and productivity traits using genic and non-genic transposable element markers in peanut. Single nucleotide polymorphism and copy number variation using RAD-Sequencing data indicated very limited polymorphism between TMV 2 and TMV 2-NLM. But phenotypically they differed significantly for many taxonomic and productivity traits. Also, the RIL population showed significant variation for a few additional agronomic traits. A genetic linkage map of 1,205.66 cM was constructed using 91 genic and non-genic Arachis hypogaea transposable element (AhTE) markers. Using single marker analysis and QTL analysis, the markers with high phenotypic variance explained (PVE) were identified for branching pattern (32.3%), number of primary and secondary branches (19.9% and 28.4%, respectively), protein content (26.4%), days to 50% flowering (22.0%), content of oleic acid (15.1%), test weight (13.6%) and pod width (12.0%). Three genic markers (AhTE0357, AhTE0391, AhTE0025) with Arachis hypogaea miniature inverted-repeat transposable element (AhMITE1) activity in the genes Araip.TG1BL (B02 chromosome), Aradu.7N61X (A09 chromosome) and Aradu.7065G (A07 chromosome), respectively showed strong linkage with these taxonomic, productivity and quality traits. Since TMV 2 and TMV 2-NLM differed subtly at DNA level, the background noise in detecting the marker-trait associations was minimum; therefore, the markers identified in this study for the taxonomic and productivity traits may be significant and useful in peanut molecular breeding.
Highlights
Peanut (Arachis hypogaea L.) is an important oilseed and legume crop apart from being a fodder crop
Significant differences were observed between TMV 2 and TMV 2-narrow leaf mutant (NLM) for number of primary branches, number of secondary branches, pod yield per plant, test weight, shelling percentage, sound mature kernel weight, arachidic acid, behenic acid, eicosenoic acid, lignoseric acid, linoleic acid, oleic acid, palmitic acid and seed dormancy
TMV 2 and its primary mutant TMV 2-NLM differed for several taxonomic, agronomic, productivity and nutritional traits
Summary
Peanut (Arachis hypogaea L.) is an important oilseed and legume crop apart from being a fodder crop. Peanut improvement through molecular breeding demands the development of genomic resources like quantitative trait loci (QTL) regions and their linked markers for various traits Such a gene discovery approach can be best-employed with genotypes that differ for many traits but are genetically related [1]. The mutant, TMV 2-NLM with linear lanceolate leaflets, belonged to Virginia runner type with semi-spreading growth habit and alternate branching pattern [5]. It showed several desirable characters such as high dry-matter production, high chlorophyll content, high dormancy, larger pod size and high test weight etc. TMV 2-NLM recorded lower linoleic acid and higher oleic acid due to a point mutation in AhFAD2A gene as compared to TMV 2 [7]
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