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Evaluation Of Mungbean With Different Genotypes

3000 words - 12 pages

Thirty mungbean (Vigna radiata (L. Wilczek) with different genotypes were evaluated at two locations of North West Frontier Province (NWFP) of Pakistan during 2007 and 2008 using randomized complete block design with three replications. Highly significant differences (P ≤ 0.01) were observed among the genotypes for vegetative and maturity traits across years at both locations as well as across years and locations. Location × year effect was highly significant (P ≤ 0.01) for days to flowering, plant height and nodes plant-1. Genotype × location interaction was highly significant (P ≤ 0.01) for days to flowering, maturity, plant height and leaf area, indicating differential performance of mungbean genotypes over the two test locations. Means for flower initiation, physiological maturity, plant height, leaves plant-1, nodes plant-1 and leaf area at Peshawar and Swat were 47.2 vs 50.5 days, 86.5 vs 84.2 days, 55.5 vs 52.3 cm, 8.1 vs 8.5, 10.6 vs 10.3 and 181.8 vs 202.4 cm2, respectively. The genetic variance was higher than environmental variance for most of the traits at both locations. Heritability estimates for the traits were generally greater in magnitude at Peshawar than Swat: 0.63 vs 0.53, 0.75 vs 0.60, 0.81 vs 0.84, 0.73 vs 0.49, 0.56 vs 0.52 and 0.50 vs 0.37 for days to flowering, maturity, plant height, leaves plant-1, nodes plant-1, and leaf area, respectively. Expected response to selection for all traits was higher at Peshawar than Swat suggesting that selection of desirable mungbean genotypes can be effectively carried out at Peshawar.

Key words: mungbean, Vigna radiata, agronomic traits, heritability, selection response

INTRODUCTION

Mungbean (Vigna radiata (L.) Wilczek) is an important pulse crop of Asia and is widely grown in India, Bangladesh, Sri Lanka, Thailand and Pakistan. It is also known as the crop of sub-continent and up to three crops per year can be grown (Malik, 1994). In Pakistan, it is grown as a supplemental and cash crop on 208.5 thousand hectares with an average yield of 546 kg ha-1. Maximum average yield of 646 kg ha-1 from an area of 9.9 thousand hectare was obtained in the North West Frontier Province (NWFP) of Pakistan due to the suitability and proper adaptation of mungbean to the agro-climatic conditions of NWFP (MINFAL, 2006). The average yield of mungbean is low due to its indeterminate growth habit, late and non-synchronous maturity, lodging, pod shattering and severe losses due to insect pests (Fernandez and Shanmugasundaram, 1988). Diversifying the limited genetic variability for traits of interest and developing new mungbean cultivars are demand of the era. In order to increase yield per hectare, new cultivars must be developed with outstanding performance and uniform maturity. The knowledge of genetic variation and heritability of agronomic traits and their interrelationship helps in understanding yield components and yield potential in mungbean.
Assessment of genetic variation is the most...

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