Correlation dependences on quantitive signs in grass pea (Lathyrus sativus L.) accessions

Abstract

To assess the phenotypic and genotypic relationships among basic quantitative indicators in grass pea the field experiment was performed in the Institute of Forage Crops, Pleven, Bulgaria during the period of 2014-2016. Correlation (r) and regression (R) analysis were applied. Six grass pea accessions were used. For the most of the indicators, phenotypic relationships were found slightly lower than the values of the coefficients of their genetic correlations. The next phenotypic and genotypic correlation coefficients were distinguished with significant medium to strong relationships: fresh plant weight with: number of leaves (r=0.99; r=0.86; r=0.88), fresh leaves weight (r=0.98, r=0.96, r=0.99) and fresh stems weight (r=0.85; r=0.97; r=0.91); fresh leaves weight with: number of branches (r=0.66; r=0.69; r=0.58) and number of pods (r=0.48; r=0.12; r=0.48); number of branches with: fresh plant weight (r=0.52, r=0.69; r=0.62), number of leaves (r=0.54, r=0.53; r=0.49) and fresh leaves weight (r=0.66, r=0.69; r=0.58). Most significant effect for the formation of seed productivity under the different conditions of the years of study have the signs of fresh root weight (R=4.829; R=2.449; R=0.01), dry stems weight (R=0.369; R=0.507; R=0.387), fresh leaves weight (R=0.297; R=0.101; R=0.097), fresh stems weight (R=0.059; R=2.027; R=0.95) and number of pods (R=0.184; R=0.095; R=0.052), but negatively exert a fresh plant weight (R= - 0.044; R= - 1.882; R= - 1.017) and nodule number (R= - 0.04; R= - 0.03; R= - 0.034). In the selection work the seed productivity can be increased by paying attention to these signs.