Abstract
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.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
