Theses and Dissertations
Issuing Body
Mississippi State University
Advisor
Macoon, Bisoondat
Committee Member
Reddy, K, Raja
Committee Member
Evans, B. Bill
Committee Member
Baldwin, S. Brian
Date of Degree
5-1-2010
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
An experiment was conducted to determine temperature effects on switchgrass seed germination, a native species with feedstock potential for the biofuel industry. Stratified seeds were germinated at constant temperatures, 15 to 45°C with 5°C interval. Maximum seed germination (MSG) and germination rate (GR), estimated by fitting sigmoid function to germination-time series data, varied among genotypes. Quadratic and bilinear models best described the MSG and GR responses to temperature, respectively. The mean cardinal temperatures, minimum, optimum and maximum, were 8.1, 26.6 and 45.1ºC for MSG and 11.1, 33.1 and 46.0ºC for GR, respectively, varied among genotypes. Genotypes were classified for temperature tolerance based on cumulative temperature response index: ‘Summer’ and ‘Expresso’ were identified as the most heat- and cold-tolerant genotypes, respectively. The functional algorithms and identified tolerant genotypes may be used to improve switchgrass models for field applications and breeding programs to develop new genotypes with enhanced tolerance for niche environments.
URI
https://hdl.handle.net/11668/15028
Recommended Citation
Seepaul, Ramdeo, "Switchgrass (Panicum virgatum L.) intraspecific variation and temperature tolerance classification using in vitro seed germination assay" (2010). Theses and Dissertations. 4174.
https://scholarsjunction.msstate.edu/td/4174
Comments
switchgrass||cardinal temperatures||Panicum virgatum||seed germination||cumulative temperature response index||tolerance||screening tool