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Evaluation of potato genotypes for field resistance against apical leaf-curl disease

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Title Evaluation of potato genotypes for field resistance against apical leaf-curl disease
 
Creator Maan, Devashri
 
Contributor Baswana, K.S.
 
Subject Potato, Kufri, potato apical leaf-curl disease incidence, screening, cultivars, growth and yield
 
Description The experiment entitled “Evaluation of potato genotypes for field resistance against apical leaf-curl
disease” was conducted at Research Area, Department of Vegetable Science, CCS Haryana Agricultural
University, Hisar during winter (Rabi) season of 2012-13. Twenty genotypes of potato were planted on 16 October
2012 in randomized block design with three replicates to screen against apical leaf-curl disease. Infector rows were
planted all-round the trial and after every tenth row. Out of 20 genotypes, Kufri Bahar, Kufri Chipsona-2, Kufri
Frysona, HIS-98-19, HIS-98-34, HIS-98-55, HIS-98-58, CP 2370, CP 2378, CP 2379 and CP 2390 were found
completely free from potato apical leaf-curl disease and considered as highly resistant. Out of these 20 genotypes,
eight genotypes/varieties were planted on 16 October 2012 in a randomized block design with three replicates.
Infector rows were planted around the plots. Analysis of variance revealed that sufficient variation existed among
the eight genotypes for all the characters under study except plant vigour at 60 DAP, leaf area index and foliage
senescence. Kufri Badshah showed better performance for most of the growth characters viz. plant height, plant
vigour, number of leaves per hill, weight of stem per hill, weight of leaves per hill, weight of foliage per hill and
leaf area index. Kufri Pushkar produced significantly maximum total (426.24 q/ha) and marketable yield (397.63
q/ha) closely followed by Kufri Badshah, which were statistically at par. Phenols were recorded maximum in
potato apical leaf-curl disease free variety Kufri Bahar while minimum was recorded in highly susceptible
genotype CP 1588. Whitefly population was observed maximum in highly susceptible genotype CP 1588, Kufri
Khyati and Kufri Pukhraj. The lower number of whitefly was found in Kufri Bahar and Kufri Pushkar that had
lower disease incidence. High phenotypic coefficient of variation and genotypic coefficient of variation were
observed for percent apical leaf-curl disease incidence at 40, 60 and 80 days after planting, whitefly population at
20 and 30 days after emergence and phenols. High heritability (broad sense) along with genetic advance as percent
of mean was found in plant height at 60 days after planting, percent percent potato apical leaf curl disease
incidence at 40, 60 and 80 days after planting, whitefly population at 20, 30 and 40 days after emergence, phenols,
number of stomata per leaf, foliage senescence at harvest, plant vigour at 60 days after planting and total and
marketable yield, indicating simple selection method for the improvement of these traits.
Correlation studies revealed that percent potato apical leaf-curl disease incidence was found significantly
and positively associated with whitefly population and number of stomata per leaf, which indicates that for
improving disease resistance, selection should be made for those lines, which have less number of whitefly and
number of stomata. The percent potato apical leaf-curl-disease incidence was significant and negative associated
with plant height, plant vigour, weight of stem per hill, weight of leaves per hill, weight of foliage per hill, leaf
area index, total yield, marketable yield, harvest index and phenols which suggests that for potato apical leaf-curl
disease incidence resistance, selection should be made on the basis of high values of these characters.
Path analysis indicated that the percent apical leaf-curl disease incidence had positive and highest
contribution (1.941) towards plant height at 60 days after planting. Highest indirect contribution was exhibited by
plant vigour at 60 days after planting (-0.032) Low population of whitefly, less number of stomata and high
phenols were the main characters contributed towards potato apical leaf curl disease resistance.
 
Date 2016-09-07T13:47:31Z
2016-09-07T13:47:31Z
2013
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/75921
 
Language en
 
Format application/pdf
 
Publisher CCSHAU