Visn. Hark. nac. agrar. univ., Ser. Biol., 2021, Issue 2 (53), p. 71-78


https://doi.org/10.35550/vbio2021.02.071




INFLUENCE OF SEASONAL FEATURES ON RESULTS OF ASSESSMENT OF PHYSIOLOGICAL-GENETIC SYSTEMS OF RATE OF INITIAL DEVELOPMENT OF WHEAT


A. F. Stelmakh, V. I. Fait

Plant Breeding and Genetics Institute
– National Center of Seed and Cultivar Investigation

(Odesa, Ukraine)

E-mail: stegen@ukr.net


The influence of the temperature regime for estimating the duration of vernalization requirement and photoperiodic sensitivity in winter bread wheat samples was characterized during cultivation of 5-days green seedlings after temporal vernalization planted at artificially reduced to 10 hours and the natural daytime conditions in different seasons. It has been shown that an unusually reduced natural temperature in the first half of the plantlet development to the tillering stage and its considerable increase in the second half (to the heading stage) led to a significant reduction in the differences between variants with less prolonged vernalization and to a significant reduction in the revealed levels of photoperiodic sensitivity: increased development delay, first of all, for the early genotypes, and its partial compensation by accelerating development in the second half for late ones, although the ranking of samples has not practically changed. The use in studies for cultivars and lines’ evaluation of the duration of vernalization requirement and photoperiodic sensitivity the control samples, which cover the whole possible scope of these wheat reactions, allows you to compare correctly the estimates results between different or similar samples for the indicated parameters even they are estimating in various environment or by different methods.


Key words: Triticum aestivum, winter bread wheat, vernalization requirement, photoperiodic sensitivity

 


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