Manjula de Silva

University of Arkansas at Fayetteville

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Larry C. Purcell

University of Arkansas at Fayetteville

C. Andy King

University of Arkansas at Fayetteville

Stefano Bona

University of Padua

Wook Han Kim

Rural Development Administration

Rachid Serraj

Food and Agriculture Organization of the United Nations

Thomas R. Sinclair

North Carolina State University

Cooperative Institutions

University of Florida

University of Arkansas at Fayetteville

Agricultural Research Service

University of Padua

Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro

Dr. Bhim Rao Ambedkar University

Universidade Federal de Santa Maria

Botswana University of Agriculture and Natural Resources

Universität Hamburg

University of Botswana

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Ureide concentration of field‐grown soybean in response to drought and the relationship to nitrogen fixation

Journal of Plant Nutrition (1998)

Larry C. Purcell Rachid Serraj Manjula de Silva Thomas R. Sinclair Stefano Bona

Abstract Ureides accumulate in soybean (Glycine max [L.] Merr.) petioles during drought under greenhouse conditions despite decreased N2 fixation and ureide production. Field experiments with water‐deficit treatments were established to examine the possibility of ureide accumulation under natural drought‐stress conditions. Tissue ureide concentration of drought tolerant 'Jackson' were compared with either 'Hutcheson' or 'Biloxi'. For mild water‐deficit conditions, petiole ureide levels were greater than a well‐watered treatment at ten sampling dates for Hutcheson compared to three dates for Jackson. At only two dates were there significant differences between genotypes in petiole ureide concentration, in which case petiole ureide concentration of Hutcheson was greater than Jackson. Under more severe water‐deficit conditions, there were greater and more consistent increases in petiole ureide concentration for Jackson and Biloxi. Jackson, however, had lower petiole ureide concentration than Biloxi throughout the measurement period for both well‐watered and water‐deficit treatments. Ureide catabolism in leaves during reproductive development was found to be negatively associated with petiole ureide concentration of Hutcheson (r=‐0.37, P=0.01), but not in Jackson (r=‐0.12, P=0.44). These results indicated that increased ureide accumulation in response to water deficits experienced under field conditions was negatively associated with drought tolerance of N2 fixation in these cultivars, and that petiole ureide accumulation may result from decreased ureide catabolism.

Petiole (insect anatomy)

Catabolism

Ecophysiology

Drought Tolerance

10.1080/01904169809365456

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Citations (48)

Soybean Petiole Ureide Response to Water Deficits and Decreased Transpiration

Crop Science (1996)

Manjula de Silva Larry C. Purcell C. Andy King

The sensitivity of N 2 fixation to drought is greater than many other physiological processes in soybean [ Glycine max L. (Merr.)], and, therefore, maintaining N 2 fixation may he a key process for improving soybean drought tolerance. The ureides, allantoin and allantoate, are the final products of N 2 fixation in soybean, and ureide concentration in petioles has been correlated with nitrogen accumulation in well‐watered plants. Petiole ureide concentration may, therefore, be used as a screening tool provided that it is closely associated with N2 fixation during drought. The objectives of this study were to determine the relationship between petiole ureides and nodule activity during drought, and to determine the relationship between transpiration rate and petiole ureide concentration in well‐watered plants. Soybean was grown in the greenhouse until the V6 growth stage when water was withheld for either 0, 4, 5, or 7 d to create several stress levels on the day of harvest. Plants were harvested at 0700, 1400, and 1900 h. In general, petiole ureide concentration increased with stress severity, and was negatively associated with nitrogenase activity at 1400 h ( r = − 0.62**) and 1900 h ( r = −0.49**) but not at 0700 h ( r = −0.34). In well‐watered plants, treatments that decreased transpiration also resulted in increased petiole ureides. The increase in petiole ureide concentration during drought was concluded to be due partially to low transpiration. Petiole ureide concentration holds promise as an indicator of N 2 fixation during drought, but the consistency of the relationship between petiole ureide concentration and N 2 fixation across genotypes must be evaluated.

Petiole (insect anatomy)

Allantoin

Ecophysiology

Drought Tolerance

10.2135/cropsci1996.0011183x003600030015x

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Citations (87)

Plant and Soil (1997)

Larry C. Purcell Manjula de Silva C. Andy King Wook Han Kim

Water Use Efficiency

10.1023/a:1004289609466

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Citations (62)