Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 18:1050-1055 (1978)
© 1978 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Screening Soybeans for Drought Resistance. I. Growth Chamber Procedure1

D. J. Sammons, D. B. Peters and T. Hymowitz2

The effects of soil moisture stress on root (RWP) and shoot (SWP) water potential, leaf lamina surface area (LSA) and dry weight (LDW), and photosynthesis (PIA) were studied in 21 to 22-day-old potted soybean (Glycine max (L.) Merr.) seedlings. Twenty cultivars were studied in an effort to detect differential response patterns to soil moisture stress. Analysis of the pooled data revealed a significant decline for all variables measured with increasing soil moisture stress. However, significant cultivar x soil moisture treatment interaction exists for all variables measured, indicating variation in cultivar response patterns to decreasing soil moisture. Cultivars were classified as drought resistant, intermediate or susceptible for each variable based on individual performance relative to average seedling response to soil moisture stress. An overall estimate of drought performance was made for each cultivar. The results suggest that soybean seedlings differ in drought response. However, cultivars were not consistently classified by the several variables measured. This suggests that assessment of cultivar drought response should be based on observations of a combination of characteristics. Comparison of the results of this procedure to those of an dependent field study suggest the desirability of further testing of the material in the field.

Key Words: Glycine max (L.) Merr. • Drought response • Leaf area • Leaf weight • Photosynthesis • Root water potential • Soil moisture stress • Tissue water potential

1 Joint contribution from the USDA-SEA and the Illinois Agric. Exp. Stn., Univ. of Illinois at Urbana-Champaign, Urbaha, IL 61801. Research supported in part by the U.S. Agency for International Development (Grant NO. AID/CM/ta-g-73-49 211 (d)). Part of a dissertation submitted by the senior author to the Graduate School of the University of Illinois in partial fulfillment of the requirements for the Ph.D. degree.

2 Former graduate research assistant (presently assistant professor, Dep. of Agronomy, Univ. of Maryland, College Park, MD 20742); soil scientist, USDA-SEA and professor of soil physics; and professor of plant genetics, Dep. of Agronomy, Univ. of Illinois, Urbana, IL 61801.

Received for publication May 12, 1978.


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P. S. Longenberger, C. W. Smith, P. S. Thaxton, and B. L. McMichael
Development of a Screening Method for Drought Tolerance in Cotton Seedlings
Crop Sci., September 8, 2006; 46(5): 2104 - 2110.
[Abstract] [Full Text] [PDF]


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