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Published in Crop Sci 14:447-450 (1974)
© 1974 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Changes in Free Proline Concentration in Sorghum and Soybean Plants Under Field Conditions1

R. P. Waldren, I. D. Teare and S. W. Ehler2

Free proline in the leaves of sorghum [Sorghum bicolor (L.) Moench cv. ‘Pioneer 846’] and soybean [Glycine max (L.) cv. ‘Calland’] was measured in the field under drought stress and adequate soil moisture. Leaf water potential and stomatal diffusive resistance were the measures of drought stress in the plants.

Free leaf proline in nonstressed plants changed during the day but seasonal changes were insignificant. Free proline increased with light intensity and varied widely in middle leaves that were shaded or received sunlight. Free proline did not accumulate significantly until plants were severely stressed and visibly wilting (about –20 bars leaf water potential in soybean). Variation was high in both stressed and nonstressed plants. However, factors that affected transpiration demand also affected free proline accumulation.

For irrigation scheduling free proline was not a good indicator of drought stress in the field because it increased after the critical time to irrigate for maximum yield.

Key Words: Drought stress • Leaf water pontential • Stomatal diffusive resistance

1 Contribution No. 1388, Department of Agronomy, Evapotranspiration Laboratory, Kansas Agricultural Experiment Station, Kansas State University, Manhattan, KS 66506.

2 Instructor, Department of Agronomy, University of Nebraska, Lincoln, NE 68503 (formerly Assistant Instructor, Department of Agronomy, Kansas State University), Associate Professor, Evapotranspiration Laboratory, and Assistant Professor, Department of Agronomy, Kansas State University, Manhattan, KS 66506.

Received for publication November 3, 1973.




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