Indian Society of Genetics & Plant Breeding

Genetic variation for leaf trichome density and its association with sucking insect-pests incidence in Asiatic cotton

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Trichomes on the plant body are known to impart
resistance/susceptibility to various insect-pests. An intra
Gossypium arboreum F2 population between a
trichomeless mutant PAUFL 1 and its wild type counterpart
was developed to assess the distribution of trichomes on
young and mature leaves, and to correlate the trichome
density with the sucking insect-pests incidence. Based on
pooled data for the years 2011 and 2012, mean trichome
count for 552 F2 plants was found to be 47.52 and 90.09 (on
28.27 mm2) for mature and young leaves, respectively. A
range of 0-185 and 0-218 trichomes was observed for mature
and young leaves, respectively. Significant positive
correlation (r = 0.83*) was obtained between trichome
density of young and mature leaves. Higher trichome
density was observed on young leaves. A positive
association between young leaf trichome density and
whitefly population was recorded which indicates that
higher trichome density is favourable for whitefly incidence
and vice versa. However, no correlation between the
trichome density of young leaves and jassid population
was observed.

Keywords: Gossypium arboreum, fibreless mutant, inheritance, leaf hopper, whitefly


Year: 2016
Volume: 76
Issue: 3
Article DOI: 10.5958/0975-6906.2016.00055.9
Print ISSN: 0019-5200
Online ISSN: 0975-6906


Baljinder Kaur info_circle
Dharminder Pathak info_circle
Vijay Kumar info_circle

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