Net photosynthetic rate {P^) of Brassica carínata strains, synthesized froin the reciprocal cytoplasms, i.e. B. carinata-226 (B. nigra x B. oleracea) and naturally occurring B. carínata which cairies B. nigra cytoplasm, was relatively less susceptible to moisture stress than the strain B. carinata-24i synthesized from B. oleracea cytoplasm. The contiibution of higher ability inherited from the B. nigra parent and higher water status inherited from the B. oleracea parent resulted in drought resistance of B. carinata-226. B. carinata-24\, synthesized from reciprocal cytoplasm was, however, not able to maintain the high water status and thus was vulnerable to moisture stress.