An evaluation of response to low temperature in several alfalfa populations

Persistent Link:
http://hdl.handle.net/10150/277900
Title:
An evaluation of response to low temperature in several alfalfa populations
Author:
Flynn, Mary Ann, 1963-
Issue Date:
1991
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
Yield and quality of nondormant alfalfa (Medicago sativa L.) may be reduced by winter frost. This study surveyed 12 populations for injury and regrowth following artificial frost. Approximately 40 plants per population were grown in a greenhouse for 70 d in styrofoam flats for each of 2 treatments (control and frost) with 4 replications. At 70 d of age, plants were clipped to 4 cm, regrown for 14 d, exposed to 5°C for 5 d to harden, and then exposed to -3°C for 6-8 h. After 2-3 d plants were scored for damage, stem height and stem number. Measurements were repeated weekly for 21 d, including a final damage score. Simulated selection comparing index selection and direct selection demonstrated positive response to selection in all populations analyzed. Selection for growth rate ratio resulted in reduced damage score, while selection for reduced damage did not improve growth rate ratio. Index selection improved both traits. Results indicate that response following frost in alfalfa may be improved.
Type:
text; Thesis-Reproduction (electronic)
Keywords:
Agriculture, Agronomy.; Biology, Genetics.
Degree Name:
M.S.
Degree Level:
masters
Degree Program:
Graduate College
Degree Grantor:
University of Arizona
Advisor:
Smith, Steven E.

Full metadata record

DC FieldValue Language
dc.language.isoen_USen_US
dc.titleAn evaluation of response to low temperature in several alfalfa populationsen_US
dc.creatorFlynn, Mary Ann, 1963-en_US
dc.contributor.authorFlynn, Mary Ann, 1963-en_US
dc.date.issued1991en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractYield and quality of nondormant alfalfa (Medicago sativa L.) may be reduced by winter frost. This study surveyed 12 populations for injury and regrowth following artificial frost. Approximately 40 plants per population were grown in a greenhouse for 70 d in styrofoam flats for each of 2 treatments (control and frost) with 4 replications. At 70 d of age, plants were clipped to 4 cm, regrown for 14 d, exposed to 5°C for 5 d to harden, and then exposed to -3°C for 6-8 h. After 2-3 d plants were scored for damage, stem height and stem number. Measurements were repeated weekly for 21 d, including a final damage score. Simulated selection comparing index selection and direct selection demonstrated positive response to selection in all populations analyzed. Selection for growth rate ratio resulted in reduced damage score, while selection for reduced damage did not improve growth rate ratio. Index selection improved both traits. Results indicate that response following frost in alfalfa may be improved.en_US
dc.typetexten_US
dc.typeThesis-Reproduction (electronic)en_US
dc.subjectAgriculture, Agronomy.en_US
dc.subjectBiology, Genetics.en_US
thesis.degree.nameM.S.en_US
thesis.degree.levelmastersen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.advisorSmith, Steven E.en_US
dc.identifier.proquest1344016en_US
dc.identifier.bibrecord.b26917270en_US
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