Lettuce variety DOINIŢA was created and patentated at SCDL BACĂU. The purpose of the paper is to present a study on the variability of the main traits and their significance for breeding. The main characteristics of the Doiniţa lettuce variety are: semi-early, with the 85-day vegetation period, for the field, the leaves are green color. High tolerance to flowering, recommended for summer - autumn crops. Resistance to aphids attack (Pemphigus bursarius – lettuce root aphids and Nasonovia ribisnigri – lettuce leaves aphids). The head: it is rounded, easly flattened, 15 cm high, 27-28 cm in diameter and 245-250 g in weight. Qualitatively it is noticed by smooth leaves, with pleasant taste.
The investigated qualitative parameters were: Vitamin C content = 19.6 mg 100 g-1 fresh product, 1.57% sugar content, 0.75% cellulose content. The annual maintenance of the quantitative and qualitative characteristics of the variety within its own limits of variability, ensures the identity of its uniformity and stability and is carried out through conservative selection works, carried out by the breeder. Statistical interpretation of data collected after measurement reflected the trait’s variability:
- low variability for head’s height (cm) and index shape;
- medium variability at head’s diameter (cm) and head’s weight (g);
- high variability at weight of seed plant -1 (g).
The data presented in the paper emphasize that the DOINIŢA lettuce variety is correctly maintained in the process of conservative selection, the variability limits being the normal ones. | 
