Proline accumulation is a common physiological response in many plants in response to a wide range of biotic and abiotic stresses. Response of free proline accumulation in two soybean (Glycine max.L.) cultivars to phosphorus (P) and iron (Fe) application under suboptimal water regime of soil at the critical flowering stage was studied in a pot experiment. P and Fe were applied at rate 100 mg and 5 mg per kg of soil, respectively. Plants were subjected to low water regime for 2 weeks at flowering stage. Plant dry matter accumulation of both cultivars increased with increasing P level regardless of soil water regimes. After two weeks of water stress (35% WHC- water holding capacity) dry mater production was significantly reduced whereas concentrations of free proline was increased in leaves and roots of both cultivars in treatment without fertilization. Cultivar Zodiac maintained higher level of proline accumulation than Licurici. Recovery upon re-watering was evidently in fertilized-plants than unfertilized plants. Cultivar Zodiac had a higher root/plant ratio of dry matter than Licurici under low nutrient and water environment. We suggest that application of nutrients could partially attenuate the adverse effect of drought on soybean productivity.

Acumularea prolinei este considerat ca o reacie fiiologic de rspuns a plantei la factorii abiotici nefavorabili. n condiiile casei de vegetaie s-au efectuat eperiene cu dou cultivare de soia unde s-a examinat aciunea aplicrii fosforului (P) i fierului (Fe) asupra modificrilor coninutului de prolin în organele plantelor, n dependen de regimul de umiditate a solului. Plantele de Glycine max., L. au fost cultivate pe sol cernoziom carbonatat asigurat insuficient cu fosfai mobili. Fosforul i fierul sau aplicat n doe de 100 mg i 5 mg per kg de sol. Dup dou sptmni de stres hidric (35% din CTA  capacitatea de ap a solului) acumularea substanei uscate s-a redus semnificativ i a fost asociat cu creterea concentraiei de prolin n frune i rdcini la ambele cultivare, indiferent de nivelul nutriiei minerale. Cultivarul Zodiac a manifestat o capacitate mai mare de acumulare a prolinei comparativ cu cultivarul Licurici. Reirigarea plantelor stresate a diminuat concentraia prolinei. Plantele cultivarului Zodiac au nregistrat valori mai mari a raportului rdcini/plant, n condiii vulnerabile de nutrieni i umiditatea solului. Aadar, fertilizarea plantelor de soia poate parial s reduc efectul advers al secetei asupra productivitii.