Theses and Dissertations

Issuing Body

Mississippi State University

Advisor

Harkess, Richard L.

Committee Member

Bi, Guihong.

Committee Member

Broderick, Shaun.

Committee Member

Cox, Michael S.

Date of Degree

1-1-2018

Document Type

Graduate Thesis - Open Access

Department

Department of Plant and Soil Sciences

Abstract

Pelargonium peltatum, ivy geranium, experiences foliar bleaching at temperatures exceeding 30° C. Contessa™ Red (heat tolerant) and Temprano™ Lavender (heat susceptible) were compared. Established plants underwent temperature treatments of 15/20° C or 25/30° C night/day with moisture treatments of 80% or 30% substrate volumetric water content (VWC). Photosynthesis, leaf greenness and growth data were collected at days 0, 7 and 11. No differences in photosynthetic rate nor a decrease in greenness in developed leaves occured in either cultivar due to high temperature or drought. Contessa™ Red had overall greater growth and leaf greenness than Temprano™ Lavender. Greenness and growth increased similarly for both cultivars at 80% VWC. Any decrease in foliar bleaching due to drought was likely due to a decrease in growth. A second study using Temprano™ Lavender indicated foliar bleaching occurs in newly emerging, developing leaves.

URI

https://hdl.handle.net/11668/16837

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