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Annals of Botany 82: 229-234, 1998
© 1998 Annals of Botany Company

N2Fixation Response to Drought in Common Bean (Phaseolus vulgarisL.)

RACHID SERRAJ+, and THOMAS R. SINCLAIR§,

USDA-ARS, Agronomy Department, Agronomy Physiology Laboratory, IFAS Building #350, University of Florida, P.O. Box 110965, Gainesville, FL, 32611-0965, USA

February 18, 1998 ; April 8, 1998 . April 30, 1998 .

Nitrogen fixation activity in common bean is generally thought to be low and sensitive to soil drying and, consequently, drought can have important negative effects on N accumulation and yield potential. The objectives of this research were to examine the response of N2fixation to drought stress in common bean, and to test the hypothesis that drought sensitivity of N2fixation in common bean is linked to ureide levels in the plants. Two glasshouse experiments were conducted to compare the responses of leaf transpiration and acetylene reduction activity (ARA) to soil water contents. ARA decrease during soil dehydration was found to lag behind the decline in transpiration. This indicates that ARA is relatively less sensitive to soil dehydration compared to leaf gas exchange. Further, in comparing two cultivars there was no consistent difference in the relative response of ARA and transpiration to soil drying. The ureide concentrations measured in common bean plants were low, ranging from 0.1 to 1.0 mmol l-1in xylem sap exudates. Ureide concentrations in the sap exudate varied significantly among the two genotypes even though there was no difference in ARA response to drought. It was concluded that in common bean, the lower sensitivity of N2fixation to drought compared to leaf gas exchange could be related to low ureide concentrations in petioles and xylem sap.Copyright 1998 Annals of Botany Company

Phaseolus vulgaris,nitrogen fixation, drought stress, nodules, ureides.


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