Reference Report for IND20525600
| Title: | Soybean host plant resistance mechanisms that alter abundance of whiteflies (Homoptera: Aleyrodidae) |
| Authors: | Lambert, A.L., McPherson, R.M., Espelie, K.E. |
| Source: | Environ. Entomol. 1995, 24(6):1381-1386 |
| Abstract: | Trichome density and erectness, plant height, plant canopy closure, and epicuticular lipid composition were measured from 14 soybean genotypes at 2 locations in Tift County, Georgia, for potential whitefly resistance mechanisms. Differences were noted in the number of trichomes per 300-mm2 leaf area, plant heights, and canopy closure indices for the 14 soybean entries, but these differences showed no correlation to 1993 and 1994 infestation levels of Bemisia argentifolii Bellows & Perring and Trialeurodes abutilonea (Haldeman). However, differences in trichome erectness ratings corresponded to differences in whitefly populations during both seasons, particularly in 1994 when overall population densities were higher. 'N88-91', 'Cook', and 'Perrin' had lower seasonal mean densities of whiteflies in 1993 and 1994 than several of the other entries. These entries also had higher erectness ratings (trichomes flat on leaf surface) than the entries with higher whitefly populations. 'N89-1' had lower erectness ratings (trichomes erect) and higher whitefly populations than most other entries in both 1993 and 1994. Analysis of the epicuticular lipid composition of 10 soybean genotypes detected differences among the entries of levels for n-hentriacontane, alpha-amyrin, beta-amyrin, and lupeol (triterpenol). These differences were not correlated to whitefly population densities for any of the chemical constituents. However, entries with low levels of lupeol (below 5 micrograms/cm2) tended to have higher whitefly populations. B. argentifolii was the predominant whitefly species observed at this test site. Over 85% of the immatures observed on the leaf surface and over 90% of the adult whiteflies captured on yellow sticky cards were B. argentifolii, whereas low numbers of T. abutilonea were observed. |
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