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Temperature sensitivity of resistance to Mayetiola destructor (Say) in synthetic hexaploid (SH) wheat derived from Triticum tauschii (Coss.) Schmal, was tested at four constant temperatures. Results indicated that T. tauschii resistance in the homozygous condition was relatively stable at high temperature. Resistance of SH plants to biotype D larvae was not significantly affected at 18, 23, or 28 ± 1°C. Resistance was significantly reduced at 31°C, although 75% of the plants maintained their resistance. SH plants exhibited a high level of antibiosis at 18 and 23°C; all larvae died in the 1st instar. Larval survival increased significantly at 28 and 31°C, with a high percentage of the increase in survival occurring on resistant plants. Resistance and level of antibiosis in F1 SH plants heterozygous for T. tauschii resistance did not differ significantly from that of SH plants when tested to biotype D and Great Plains biotype at 18°C. Resistance of F1 SH plants to both biotypes was greatly reduced at 28°C. Also, larval survival was greater on resistant F1 SH plants than on resistant SH plants. Results suggest that the penetrance and expressivity of the single-gene resistance derived from T. tauschii appear to be dependent upon both environmental temperature and allelic dosage. For maximum resistance of hybrid wheats, both parents would have to be homozygous to produce homogeneous resistant F1 populations.
Document Type: Research Article
Publication date: April 1, 1983
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Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.