Document Type

Thesis - Open Access

Award Date


Degree Name

Master of Science (MS)

Department / School



Comparatively little specific breeding for drought resistance has been done owing primarily to the complex nature of the reaction to drought. Plant breeders have searched for a long time to find some morphological or physiological character that could be associated with drought resistance. If such a character should be found, it would greatly facilitate selections of plant material superior in his respect. Efforts in this study have been directed toward establishing a relationship between the intensity of plant color and drought reaction. If the darker shades of the green color are a result of greater chlorophyll concentration, and if high concentrations of chlorophyll in the plant tissues result in greater accumulations of dry matter, it seems reasonable to assume that a certain color intensity might influence the reaction of a plant to drought through its influence in the photosynthetic processes. Plants which are capable of withstanding drought are probably capable of withstanding high temperatures since one is usually associated with the other. Leaf temperature and light reflection studies of plants having different color intensities should give a measure of their ability to dissipate heat. This paper is comprised of four separate sections. The first deals with chlorophyll analysis as a measure of color intensity. Following, are sections relating to leaf temperatures, light reflections from leaf surfaces, and drought reactions as determined under artificial, atmospheric drought conditions.

Library of Congress Subject Headings

Plants -- Color
Barley -- Color
Plants, Effect of drought on


Includes bibliographical references (pages 38-39)



Number of Pages



South Dakota State University


No Copyright - Non-Commercial Use Only


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