Variability for root traits in sunflower hybrids and inbreds

Abstract

54 inbreds and 8 hybrids of sunflower were studied for variability in root traits by growing them in polybags (90 cm length and 40 cm diameter) of 120kg soil capacity @ 2 plants per bag for 65 days during rabi. FYM was mixed with soil in the ratio of 1: 5 (v/v). Plants were irrigated as and when required. Observations were recorded at the time of harvest. Wide genetic variability was observed for all the parameters studied. Hybrids recorded higher root weight, volume, length, total dry matter (TDM), leaf area, leaf number compared to inbreds. Root weight showed strong positive relationship with TDM (0.77) and leaf area (0.62) compared to root volume (0.74 & 0.61) and root length (0.62 & 0.55). Among the root traits, root weight and volume showed good correlation +0.89 compared to their relation with root length. Root traits did not show any relation with SCMR and SLA (specific leaf area). A selection index was computed using principal component analysis by taking into consideration root characters along with TDM and leaf area. Based on the index value, hybrids DRSH-1, NSFH-1001 and inbreds 106A, 335 A, AKSFI-42-I, DS-2, 298-R, CSFI-5075, 856-R, R-7, CMS-335A were found promising.