Theses and Dissertations

Issuing Body

Mississippi State University


Trader, W. Brian

Committee Member

Matta, B. Frank

Committee Member

Reddy, Raja K.

Committee Member

Gu, Mengmeng

Committee Member

Harkess, L. Richard

Date of Degree


Document Type

Graduate Thesis - Open Access



Degree Name

Master of Science


College of Agriculture and Life Sciences


Department of Plant and Soil Sciences


Temperature affects reproductive potential, aesthetic and commercial value of ornamental peppers. In experiment one, temperature effects were assessed in 12 ornamental cultivars using in vitro pollen germination and tube length, and the physiological parameters, cell membrane thermostability, chlorophyll stability index and canopy temperature depression. In experiment two, seed germination rate and maximum seed germination response to temperature were assessed. Cumulative temperature response indices (CTRI) for pollen, seed, and physiological parameters were derived and used to classify cultivars for temperature tolerance. CTRI based on pollen parameters showed significant, but poor correlation with physiological parameters. CTRI based on seed parameters showed significant correlation with CTRI-physiological parameters. It is concluded that screening using pollen parameters will be ideal for reproductive temperature tolerance while seed and physiological parameters will be suitable for screening vegetative temperature tolerance. Identified tolerant cultivars are potential candidates for breeding programs to develop heat and cold tolerant ornamental pepper genotypes.



temperature tolerance||cardinal temperature||pollen||ornamental pepper||seed germination||physiological