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Effect of Leaf Color, Chlorohyll Concentration, and Temperature on Photosynthetic Rates of Isogenic Barley Lines¹

Leaf color and chlorophyll content may affect canopy temperature and, indirectly, plant metabolism and dry matter production. Photosynthesis (P), light saturation, specific leaf weight (SLW, mg/cm²), and chlorophyll content (mg/dm²) of barley lines isogenic for color were measured over a range of temperatures using plants grown in one field and two greenhouse experiments.

In the first greenhouse experiment P of all lines did not differ at temperatures of 20, I5, and 30 C. Differences in P occurred among three cultivars, but the differences between isogenic pairs were significant for the cultivar ‘Colsess’ only. In the second greenhouse experiment P was highest at 25 and 30 C, slightly lower at 35 C, and lowest at 15 and 20 C. P on a leaf area basis differed only for the isogenes of ‘Betzes’ but on a unit of chlorophyll basis was significantly higher for each pale green or golden member of an isogenic pair. Pale barley leaf blades had a higher light saturation point than norreal green leaf blades. SLW was greater for the green member of one isogenic pair but not significantly different between members of other pairs.

Highest P of field grown plants occurred at 25 C. Green members of isogenic pairs had significantly higher P than pale green or golden members. SLW of field grown green isogenes was significantly higher than that of pale green or golden isogenes and higher than SLW of plants grown in the greenhouse.

Key Words: Barley mutants

² Professor, Plant and Soil Science Dept., Montana State University, Agronomist, Plant Science Research Division, Agricultural Research Service, USDA, and Assistant Professor and Professor, Plant and Soil Science Dept., Montana State University, Bozeman, Montana 59715.

Received for publication January 24, 1972.