Modifying selected factors to classify levels of resistance or tolerance in wheat to Septoria Tritici Blotch Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/3t945v11s

Descriptions

Attribute NameValues
Creator
Abstract or Summary
  • Influence of abiotic and biotic factors were examined in selected winter wheats previously identified as representing a range of responses to septoria infection. In the greenhouse two and three inoculations identified resistance when disease severity was assessed either for the top four leaves or the flag leaf respectively. Kernel number per spike and late tillering were more effected than kernel weight. In a dry year, artificial inoculation and disease severity assessed at the top four leaves identified resistance in the field. Inoculum naturally present in the environment allowed the separation of resistant and susceptible entries during the wet year. The disease progress rate identified "late septoring" materials. Under dry conditions, late sown plots required a plastic film cover after inoculations to distinguish reaction patterns. An average plot yield loss of 20% was obtained by artificial inoculation under high rainfall conditions and no yield loss was recorded during the dry year. The number of kernels per spike, kernel weight, and test weight were also reduced in a high rainfall year. Under dry conditions the number of kernels per spike was reduced in artificially inoculated plots. Kernels per spike was reduced in late sown plots, but kernel weight was reduced in these plots only in the wetter year. Grain hardness nor grain protein percent were affected by the disease. Agreement was found between greenhouse and field disease severity estimation, but correlations between disease severity and yield were different. Correlations calculated in the field between seasons were also inconsistent. Spike and stem dry weight (g/cm) and dry stem mono- and disaccharide content were reduced by Septoria infection. The dry weight of the top four leaves and the amount of mono- and disaccharides collected in flag leaf phloem exudate were not affected. These sugars were reduced by Septoria infection during three sampling dates in stem phloem exudate . The mono- and disaccharides of dry stem and of stem phloem exudate were negatively associated with flag leaf disease severity and positively associated with stem dry weight (g/cm).
Resource Type
Date Available
Date Copyright
Date Issued
Degree Level
Degree Name
Degree Field
Degree Grantor
Commencement Year
Advisor
Committee Member
Academic Affiliation
Non-Academic Affiliation
Subject
Rights Statement
Peer Reviewed
Language
Digitization Specifications
  • File scanned at 300 ppi (Monochrome) using Capture Perfect 3.0.82 on a Canon DR-9080C in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
Replaces
Additional Information
  • description.provenance : Made available in DSpace on 2013-06-10T21:13:35Z (GMT). No. of bitstreams: 1 ReJoseVicente1988.pdf: 1128292 bytes, checksum: 25b7e8a6420631b0c0531993c48b1d90 (MD5) Previous issue date: 1987-09-02
  • description.provenance : Submitted by Kim Stowell (ksscannerosu@gmail.com) on 2013-05-31T21:41:51Z No. of bitstreams: 1 ReJoseVicente1988.pdf: 1128292 bytes, checksum: 25b7e8a6420631b0c0531993c48b1d90 (MD5)
  • description.provenance : Approved for entry into archive by Deborah Campbell(deborah.campbell@oregonstate.edu) on 2013-06-10T21:13:35Z (GMT) No. of bitstreams: 1 ReJoseVicente1988.pdf: 1128292 bytes, checksum: 25b7e8a6420631b0c0531993c48b1d90 (MD5)
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2013-05-31T21:51:01Z (GMT) No. of bitstreams: 1 ReJoseVicente1988.pdf: 1128292 bytes, checksum: 25b7e8a6420631b0c0531993c48b1d90 (MD5)

Relationships

Parents:

This work has no parents.

Last modified

Downloadable Content

Download PDF

Items