Genetic Variability, Character Association and Path Coefficient Analysis in Radish (<i>Raphanus sativus</i> L.)

Abstract

Genetic variability, correlation and path coefficient analysis of yield and yield contributing traits in twenty one varieties of radish were studied. Root length, leaf length and root yield showed high genotypic coefficient of variation and heritability with high genetic advance in percentage of mean. The highest genetic advance was observed in root yield. Root yield had significant and positive correlation with days to harvest, root length and root diameter, and showed only positive correlation with plant height and leaf width. Path coefficient analysis revealed that plant height had the maximum positive direct effect on root yield followed by root diameter, leaf width and days to harvest.

Biometrical studies of yield and related traits in advance breeding lines of bush type vegetable cowpea [Vigna unguiculata (L.) Walp.]

“…High values of broad sense heritability (>87%) in conjunction with high genetic advance as percentage of mean (>22%) were obtained for the traits such as number of peduncles per plant, pod yield per plant, number of pods per plant, peduncle length, number of primary branches per plant, pod length, pod weight and number of seeds per pod which is an indicative of additive gene action and selection based on these parameters would be more reliable. These observations find the support from previous workers Nath et al, (2009); Ullah et al, (2011);Huque et al, (2012a); Chattopadhyay et al, (2014).…”

“…Thus, selection of these traits on the basis of genotypic value may be effective. Similar results were earlier reported by several workers (Lal et al, 2007;Ullah et al, 2011;Huque et al, 2012a;Nwofia et al, 2013;Chattopadhyay et al, 2014).…”

“…Among the nine yield component traits, number of pods per plant followed by pod weight showed highly positive direct effect on pod yield per plant which corroborates the findings of previous workers (Lal et al, 2007;Ullah et al, 2011;Chattopadhyay et al, 2014). The present study indicated that direct selection of these two characters could be beneficial for yield improvement of bush type vegetable cowpea since these characters also showed positive correlation with pod yield per plant.…”

“…Pod yield in vegetable cowpea is complex, highly variable and is associated with a number of component characters (Ullah et al, 2011;Huque et al, 2012a). The knowledge of genetic variability and character association between yield and its component characters is an essential requirement for yield improvement (Fraser and Eaton, 1983).…”

Correlations and path analysis of yield components in cowpea

“…The variable of number of beans per pod obtained direct negative effect (-3.5249) with the variable of grain yield, being in agreement with the results found by Ullah et al (2011). Magnitudes of the direct effects of the character analyzed on grain yield were greater than the magnitudes of their respective correlations.…”