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1 October 2006 Does R Gene Resistance Allow Wheat to Prevent Plant Growth Effects Associated with Hessian Fly (Diptera: Cecidomyiidae) Attack?
K. G. Anderson, M. O. Harris
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Abstract

Resistance genes (R genes) are an important part of the plant’s immune system. Among insects, the Hessian fly, Mayetiola destructor (Say) (Diptera: Cecidomyiidae), larva is the target of the greatest number of characterized R genes (H1H32). The biochemical/molecular mechanism of R gene resistance to Hessian fly is not well understood. In the absence of an effective R gene, larvae caused extensive growth deficits (>30 cm) in wheat seedlings. In the presence of one of three effective R genes, H6, H9, or H13, larvae caused small growth deficits (≈3–4 cm) in two leaves (third and fourth) that were actively growing during the first days of larval attack. After larvae died on R gene plants, the fifth leaf and tiller leaves exhibited small increases in growth (2–4 cm). Growth responses of susceptible and resistant plants diverged at a time when Hessian fly larvae were establishing a nutritive gall tissue at feeding sites. The results of this study support the hypothesis that R gene resistance cannot prevent initial larval attack, but, by stopping the formation of the larval gall, it prevents the most serious consequences of larval attack.

K. G. Anderson and M. O. Harris "Does R Gene Resistance Allow Wheat to Prevent Plant Growth Effects Associated with Hessian Fly (Diptera: Cecidomyiidae) Attack?," Journal of Economic Entomology 99(5), 1842-1853, (1 October 2006). https://doi.org/10.1603/0022-0493-99.5.1842
Received: 9 March 2006; Accepted: 1 June 2006; Published: 1 October 2006
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