%0 Journal Article
%T Generation Means Analysis for Thrips (Thysanoptera: Thripidae) Number and Leaf Damage by Thrips Feeding in Peanut
%A K. Niyomsil
%A S. Jogloy
%A M. Keerati-kasikorn
%A C. Akkasaeng
%J Asian Journal of Plant Sciences
%D 2007
%I 
%X As disease vectors and damaging pests, several thrips species are important for peanut production. Development of resistant cultivars is economical and sustainable mean to combat the problem. To achieve this goal, a better understanding of genetic control of thrips resistance is of paramount importance to the success of breeding programs. The objective of this study was to estimate relative importance of genetic parameters for total thrips number, number of adult thrips, number of larval thrips and leaf damage by thrips feeding, which might be indicative of thrips resistance in the three crosses of peanut, using generation means analysis. The experiment was conducted in a farmer¡¯s field after rice harvest in Kalasin province in the Northeast of Thailand during dry season in 2002. Seven generations of three crosses were evaluated in a randomized complete block design with six replications under natural infestation of thrips population. Data of 50 days after planting (DAP) were reported for thrips number and data of 60, 70 and 80 DAP were reported for leaf damage. Dominance gene effect was significant in the cross ICGV 86388 x IC 10 for number of adult thrips and number of total thrips and in the cross ICGV 86388 x Khon Kaen 60-1 all genetic parameters estimated were not significant expect for dominance by dominance of adult thrip number. Additive gene effect was found in the cross IC 10 x Khon Kaen 60-1 for total thrips number. Additive x dominance epistatic gene effect was also found in the cross IC 10 x Khon Kaen 60-1 for total thrips number and larval thrips number, while dominance x dominance was expressed for adult thrips number. Additive genetic parameter for thrips damage was not significant for three sampling dates. Dominance and epistatic gene effects were significant in the cross IC 10 x Khon Kaen 60-1. Improvement of thrips resistance may be possible in the cross IC 10 x Khon Kaen 60-1 because of significant additive gene effect.
%K Genetic parameter
%K gene effect
%K relative importance
%K thrips resistance
%U http://docsdrive.com/pdfs/ansinet/ajps/2007/269-275.pdf