01477naa a2200205 a 450000100080000000500110000800800410001910000260006024501260008626000090021252008310022165000260105265000250107865000260110365000230112965000220115270000160117470000160119077300650120616482531999-08-16       1998    bl ---       0--  u    #d1 aCARVALHO, M. H. C. de  aComparison of the physiological responses of phaseolus vulgaris and Vigna unguiculata cultivars when submitted to drought  c1998  aThree cultivars differing in their susceptibility to water stress were compared-Phaseolus vulgaris cv. Carioca (susceptible), Vigna unguiculata cv. IT83D (intermediately tolerant) and V. unguiculata cv. EPACE-1 (tolerant) - during an imposed water stress treatment. Variation in leaf gas exchange (i.e. assimilation and stomatal conductance) and ;eaf relative water content in response to progressive substrate water depletion were investigated. To verify the extent of the injury caused by the drought treatment, leaf gas exchange was measured after rehydration. In the three cultivars, stomatal conductance declined before leaf relative water content was afffected. P. vulgaris showed the largest decrease in the rate of stomatal conductance with decreasing substrate water content compared to both V. unguiculata cultivars.  anet assimilation rate  astomatal conductance  aPennisetum Americanum  aPhaseolus Vulgaris  aVigna Unguiculata1 aLAFFRAY, D.1 aLOUGUET, P.  tEnvironmental and Experimental Botanygv.40, p.197-207, 1998