Oat (Avena sativa L.) genotypes Chamois (drought tolerant) and Someşan (drought sensitive) were grown in pots in greenhouse under controlled conditions and submitted to drought as follows: V 0 - normally hydrated control variant (0 S); V 1 - 5-day drought  (5 S); V 2 - 10-day drought (10 S); V 3 – rehydrated after 10-day drought (10 S – 5 R). The observations and determinations were performed during the phenophases of vegetative mass development upon the following physiological indices:- the osmotic potential of the second leaf (- bar, - the free proline quantity within the foliar apparatus (mg/g.d.w.), - the quantity of chlorophyll pigments (mg./g.d.w.). All these determinations were carried out upon the foliar apparatus belonging to young, mature and senescent leaves competition with the biosynthesis of the chlorophyll pigments. The genotype Chamois (drought tolerant) has an  increased capacity of proline biosynthesis in  competition with the biosynthesis of the chlorophyll pigments.

free proline; chlorophyll; osmotic potential; drought stress; oat

Presentation: oral