Genetic analysis of recombinant inbred lines for iron deficiency chlorosis and productivity traits in groundnut uri icon

abstract

  • Iron deficiency is an important abiotic constraint reducingthe growth and yield of groundnut especially undercalcareous soils. Foliar application of Fe-chelates canovercome iron deficiency but it is not economical.Evaluation of 318 recombinant inbred lines (RILs) alongwith parents for iron deficiency chlorosis (IDC) andproductivity traits under iron deficient soils over three yearsindicated significant genotypic and genotypic xenvironment interaction (GE) component for both IDC andproductivity traits. Among the RILs, range of variation washigher than that of the parents for visual chlorotic rating(VCR), SPAD chlorophyll meter reading (SCMR) andproductivity parameters across three years indicated thepresence of transgressive segregants. VCR had higherphenotypic and genotypic, variances, heritability andgenetic advance as per cent of mean (GAM) in all the threeyears as compared to SCMR. Among productivity traits,pod yield (g plant?1) had higher PCV and GCV compared toshelling per cent and 100 seed weight. Significant negativecorrelation between VCR and pod yield per plant indicatedeffect of IDC on productivity in RILs. Nine lines weresuperior for both IDC tolerance and productivity traits. Thisextensive phenotyping of RIL population for IDC toleranceunder iron deficient conditions can be used foridentification of genomic regions associated with IDCtolerance by genotyping of this RIL population

publication date

  • 2017