Studies on the morphobiological characteristics, productivity and resistance to high temperatures at tomatoes

Abstract

The paper presents the results of the appreciation of varieties and lines from the collection of tomatoes of the Institute of Genetics, Plant Physiology and Plant Protection, Republic of Moldova based on productivity, resistance to stressing temperatures and some fruit characters. The analysis of the useful characters of the studied forms from the collection revealed a wide variability in the fruit characters, the overall productivity, the share of the fruits, which allows selection and recommendation of the most valuable forms for hybridization and obtaining new varieties and hybrids of different destination. Cluster analysis (k-means method) demonstrated that the 38°C temperature level manifested a higher discriminative capacity of tomato clusters based on root and strain length (controlled conditions), which revealed the more pronounced interaction specificity with this temperature level. Were identified clusters of tomato genotypes with diminished reaction at stressful temperatures, which is important for the involvement in programs to improve genotypes with increased resistance to heat.