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Asian Journal of Plant Sciences
Year: 2009  |  Volume: 8  |  Issue: 5  |  Page No.: 325 - 334

Heritability and Correlation of Drought Resistance Traits and Agronomic Traits in Peanut (Arachis hypogaea L.)

M. Painawadee, S. Jogloy, T. Kesmala, C. Akkasaeng and A. Patanothai    

Abstract: Several physio-morphological traits are related to pod yield of peanut. Improvement of these traits should lead to yield increase under drought conditions. The objective of this study was to evaluate (1) heritability of drought resistance traits, yield and yield components and (2) relationships among these traits. A cross of two parents (ICGV 98324 and KK 4) differing in physio-morphological traits was used in this study. Pot experiments of F2 and F3 populations were set up in the open field with rainout shelters. One hundred and twenty eight entries were subjected to water stress during 28 to 70 days after sowing and evaluation of the studied characters was conducted at appropriate time. Data were recorded for Root Dry Weight (RDW), Root Length (RL), Root Surface (RS), Root Volume (RV), Specific Leaf Area (SLA), SPAD Chlorophyll Meter Reading (SCMR), biomass, pod yield, pod number per plant, seed number per pod, 100-seed weight and Harvest Index (HI). Heritability estimates in broad sense for root characters and drought resistance traits were low to intermediate, ranging from 0.27 to 0.59. Similarly, low to intermediate heritability estimates in broad sense were found for pod yield and yield components, ranging from 0.20 to 0.57. Heritability estimates in narrow sense were much lower than in broad sense. The correlation coefficients among root characters were inter-related positively, whereas negative correlation coefficients were observed among physiological characters. Root characters were closely related to biomass production but they were not related to yield and yield components except for pod number per plant.

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