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Yield realizing in vegetable crops depends on several reproductive processes that include pollen fertility as well as pollen tubes germination and growth. The study was conducted as the pollen characteristics fertility and viability were used, as well as the productivity for evaluation of drought tolerance in four pepper genotypes Capsicum annuum L. From the conducted cytological analyses was found that decreasing the water standard with 50% exert negative influence over the male gametophyte and the pollen fertility decreases with up to 37.4% average. More sensitive to drought showed to be the plants from both cultivars Pazardzhishka kapia and Albena, in which lower productivity and lower restorable potential were found in comparison with those found in the mutant lines No.1936 and No.1917. Increased tolerance showed the male gametophyte of line No.1936. After a drought in it were found the highest values for pollen viability – 33.4% average pollen germination and 438.7µm pollen tubes length which was with proven mathematical difference compared with the rest of the genotypes. These results showed that pollen fertility analyses and pollen viability analyses in drought plants could be used for evaluation of the drought tolerance.

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The aim of the study is to select pepper genotypes with increased drought tolerance based on an economic assessment of productivity in conditions of water deficit. The experiments were conducted during 2018-2019 in glasshouse Venlo type in the MVCRI. Two variants of irrigation regime are applied: 100% irrigation norm and 50% irrigation norm according to the technology adopted for this production in eight pepper (Capsicum annuum L.) genotypes - lines № 1966, 1917, 1931, 1936, 1928, 1930, C41 and C45, which were cultivated as a substrate culture (PE bag 16 L) without heating. In assessing the economic indicators in greenhouse production of pepper in order to select drought-tolerant genotypes of pepper according to the summary indicator rate of return with the highest economic effect of drought achieved with reduced to 50% irrigation regime are distinguished lines № 1928, № 1966 and № 1931.