Theses and Dissertations

Issuing Body

Mississippi State University

Advisor

Macoon, Bisoondat

Committee Member

Reddy, Kambam Raja

Committee Member

Baldwin, Brian S.

Committee Member

Seepaul, Ramdeo

Committee Member

Melanson, Rebecca A.

Date of Degree

5-1-2020

Document Type

Graduate Thesis - Open Access

Major

Agronomy

Degree Name

Master of Science

College

College of Agriculture and Life Sciences

Department

Department of Plant and Soil Sciences

Abstract

Temperature is a major abiotic stress limiting plant growth. Thermotolerance evaluation during germination and early growth may help identify adaptable genotypes of new crops. Two studies were conducted to evaluate temperature effects on 12 Brassica carinata genotypes during germination and early growth. During germination, genotype AX17004 was both the most cold- and heat-tolerant. During early-season growth (35 d after seeding), there were temperature and genotype effects on shoot, root, and physiological components. Cumulative low- and high-temperature response indices, and cumulative root and shoot response indices were related, indicating the importance of these traits. Genotype AX17006 was identified as heat tolerant, and AX17009 as cold tolerant during early-season growth. When genotypes were grouped according to breed types, hybrids generally had better responses than the inbred lines, and double haploids and the check responses were intermediate. These studies provided rapid results that will reduce the number of genotypes assessed in field studies.

URI

https://hdl.handle.net/11668/16679

Sponsorship

USDA National Institute of Food and Agriculture-Agriculture and Food Research Initiative Competitive Grant, through the Southeast Partnership for Advanced Renewables from Carinata (SPARC) project: Project no. USDA-NIFA 2016-11231

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