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Plant Physiology 64:551-556 (1979)
© 1979 American Society of Plant Biologists

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Growth and Specific Nodule Activity of Soybean during Application and Recovery of a Leaf Moisture Stress 1

Robert P. Patterson2, C. David Raper, Jr.3 and H. Douglass Gross2

2 Department of Crop Science, North Carolina State University, Raleigh, North Carolina 27650, 3 Department of Soil Science, North Carolina State University, Raleigh, North Carolina 27650

Soybean plants growing at day/night temperatures of 30/18, 26/18, and 22/18 C were subjected to a single drying and recovery cycle during an 18- to 19-day period in the early to midpod development stage. Leaf total electrochemical water potential was reduced to about –24 bars during the 4-day drying cycle at all temperatures, but recovered to control levels upon rewatering. The changes in dry matter accumulation in whole plants and plant parts, specific activity of nodules as measured by acetylene reduction, and levels of adenosine phosphates in nodules were measured periodically during stress and recovery.

Vegetative and reproductive growth were about equally suppressed by the leaf moisture stress. Both rate of appearance and number of pods were reduced. However, a similar average weight per pod for both stressed and control plants at the conclusion of the recovery period suggests that individual pod development is not irreversibly affected by a single stress cycle and that yield potential is restricted by a decrease in number of pods or seed. Dry matter accumulation in plants and pods was unaffected by temperature.

Specific nodule activity and energy charge of nodules declined concurrently with leaf moisture potential. Recovery of specific nodule activity following rewatering lagged behind recovery of leaf moisture potential, but energy charge of nodules recovered as rapidly as leaf moisture potential upon rewatering. Thus, the delayed recovery of specific nodule activity does not appear to be related to recovery of energy charge of the nodules.

1 Paper No. 5893 of the Journal Series of the North Carolina Agricultural Research Service, Raleigh, North Carolina 27650. Operation of the phytotron unit of Southeastern Plant Environmental Laboratories at North Carolina State University was supported in part by National Science Foundation Grant GI-28951. Research reported in this paper was supported in part by a grant from the North Carolina Soybean Producers Association, Inc., and by USDA-SEA-CR Grant 701-15-26.






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Copyright © 1979 by the American Society of Plant Biologists