Studies on morphological and biochemical traits for potato apical leaf curl virus disease resistance in potato (Solanum tuberosum L.)
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Date
2015
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CCSHAU
Abstract
The experiment entitled “Studies on morphological and biochemical traits for potato apical leaf curl virus disease resistance in potato (Solanum tuberosum L.)” was conducted at Research Farm of Department of Vegetable Science, CCS Haryana Agricultural University, Hisar during rabi seasons of 2012-13 and 2013-14. One hundred sixty seven potato genotypes were planted in randomized block design with two replications for screening against potato apical leaf curl virus disease (PALCVD) during rabi season of 2012-13. Infector rows were planted all around the trial and after every tenth row. Based on the disease reaction, 167 genotypes were categorized in to resistant (97), moderately resistant (21), susceptible (14) and highly susceptible (35) categories. During rabi season of 2013-14, twenty-two genotypes (13 resistant, 4 moderately resistant and 5 susceptible) were selected for detailed study and planted in RBD with three replications. Significant and greater amount of variation was observed among the genotypes for all the 21 characters studied. Kufri Bahar and AICRP-PH-2 were completely free from PALCVD whereas, Kufri Khyati was highly susceptible. Kufri Garima produced the highest yield (364.20 q/ha) followed by Kufri Khyati and Kufri Sadabahar. Phenols (83.75mg/100g) and orthodihydroxy phenols (15.65mg/100g) were maximum in disease free genotype Kufri Bahar and low in all the susceptible genotypes. Whitefly population was high in susceptible genotypes like Kufri Khyati and Kufri Pukhraj. The lower numbers of whitefly was found in resistant genotypes, which had lower disease incidence. High PCV, GCV, with high heritability and genetic advance as per cent mean were observed for plant height at 45 and 60 DAP, leaf area, weight of leaf, stem & total foliage /hill, total and marketable yield, number of stomata, number of trichomes, whitefly population at 5, 10, 15 days after emergence, phenols, orthodihydroxy phenols and total sugars indicating simple selection method for the improvement of these traits. Correlation studies revealed that per cent potato apical leaf curl virus disease incidence had significant and positive association with whitefly population, number of stomata, leaf area, and total sugars while, per cent disease incidence had significantly negative correlation with number of trichomes, phenol content and orthodihydroxy phenols. Path analysis showed that leaf area, total sugars and whitefly population exhibited high positive direct effects on disease incidence, while the characters like number of trichomes, orthodihydroxy phenols had high direct negative effects, and other characters exerted indirect negative effects through these traits indicating that these were the major contributing characters to PALCVD incidence in potato.
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planting, diseases, genotypes, potatoes, yields, cultivation, fungi, phenols, biological phenomena, genetics