TITLE:
Differential Aphid Colony Establishment in Dolichos lablab Varieties Correlated with Some Plant Specific Factors That Impact on Aphid Fecundity
AUTHORS:
Hossain Ali Mondal, Suvendu Kumar Roy, Lakshmi Hijam, Moumita Chakraborty, Puspendu Dutta, Tapan Kumar Hath
KEYWORDS:
Dolichos lablab, Aphid Colony, Differential Vine Diameter, Differential Wet/Dry Weight Ratio of Vine, Differential Phloem Pressure, Differential Compactness of the Vine, Differential Aphid Fecundity, Differential Water Content in Aphid
JOURNAL NAME:
American Journal of Plant Sciences,
Vol.8 No.4,
March
29,
2017
ABSTRACT: Aphid establishes colony in the
selective plant parts like vine, leaf petiole, leaflet, inflorescence, and
tender fruit in Dolichos lablab Linn
but not the entire plant. In this study, the aphid colony establishment in vine
is focused to understand the differential resistance response between two
varieties. At the early stage of aphid infestation, the aphid colony
establishment was significantly different between two genotypes (p value =
0.00) and abbreviated as “resistant” variety that supported lower aphid
proliferation (mean value = 48.2 ± 2.2) and “susceptible” variety that
supported comparatively higher aphid proliferation (mean value = 215.5 ± 16.9).
The total aphid number was significantly different between the two varieties,
realized at the early infestation stage when both “antixenosis” and “antibiosis”
defense mechanisms were working on. Some plant specific factors like vine
diameter, wet/ dry weight ratio of vine, phloem sap pressure, the compactness
of the vine, wet/dry weight ratio of leaflet, length of leaf petiole, diameter
of leaflet vein were identified as modulating factors. The impact of resistant
variety on aphid was also investigated for better understanding of aphid
defense mechanism.