Spectral evaluation of winter wheat varieties and breeding lines during the restoration of spring vegetation

Development of new and introduction of existing methods of field estimation of genotypes of winter wheat is one of the key tasks of modern selection. The use of modern screening methods in breeding allows the breeder to obtain a more objective assessment, as well as to increase the volume of the studied samples. The time of restoration of spring vegetation (TRSV) is one of the most important stages of the vegetation period of winter wheat. Biometric and spectral evaluation of winter wheat with the onset of TRSV makes it possible to establish how plants of a certain genotype overwintered, as well as the state of their growth and development before the second growing season. The aim of the study was to establish the peculiarities of growth and development of plants of modern varieties and promising selection lines of winter wheat of the V.M. Remeslo Myronivka Institute of Wheat from sowing to the restoration of spring vegetation. Hydrothermal conditions of the period of germination-TRSV differently affected the reproductive process of the studied genotypes of winter wheat. According to research, abnormally arid conditions from sowing to the end of autumn vegetation in 2019 had a negative impact on the condition of winter wheat plants, which were in phase 10-13 according to the international classification of BBCH, autumn tillering did not occur. Regardless of the genotype, the plants of the first sowing period were more developed. At the time of resumption of spring vegetation in terms of biometric and spectral indicators better than the standard Podolyanka (NDVI = 0.52) were: varieties MIP Dnipryanka (NDVI = 0.58), MIP Lada (NDVI = 0.56), Balada Myronivska (NDVI = 0.56) and lines Lutescens 37519 (NDVI = 0.55) and Erythrospermum 55023 (NDVI = 0.58). During the second sowing period, the MIP Dnipryanka variety (NDVI = 0.45) and the selection lines Lutescens 37519 (NDVI = 0.44) and Erythrospermum 55023 (NDVI = 0.43) were isolated. The Podolyanka standard variety had an NDVI index value of 0.43. Varieties MIP Lada and Balada Myronivska are more sensitive to sowing dates and require a longer period of autumn vegetation to accumulate more dry matter and better winter dormancy.