Characteristic of new rice varieties grown in old-deltoid and valley agrolanscapes of Krasnodar region by physico-chemical traits of the grain
The purpose of the study was to study the physico-chemical екфшеы of quality of rice varieties of ARRRI breeding: Rapan, Flagman, Olymp, Favorit, Krepysh, Apollon, grown in 2016-2017 in the old-deltoid and valley agrolandscapes of the Krasnodar region: fracture, amylose content in grain starch, amylographic characteristics of starch dispersion. To evaluate the variability of indicators of traits of varieties, select the best of them for cultivation in agrolandscape zones. In Krasnodar region, rice is grown in farms located in old-deltoid, transitional, young-deltoid, valley and off-deltoid agrolandscape zones. The grain was peeled on the peeling machine “Satake" (Japan), polished on the unit LUR 1M. The grain fracture was determined using a DSA-3 diaphanoscope. The amylose content was determined according to Giuliano and GOST 6647-1 2015 The amylographic characteristics of starch dispersion were evaluated by torque in accordance with the instructions on the Brabender microvisoamilograph. Physical and chemical traits of grain quality in rice varieties Rapan, Flagman, Olymp, Apollon, Favorit and Krepysh, grown in the Abinsk and Krasnoarmeysky districts, respectively, of the old-deltoid and valley agrolandscapes were characterized by variability. The best quality by fracturing was in varieties Favorit, Apollon grown in Krasnoarmeysky district; Olymp, Krepysh grown in Abinsk district. The results of determination of the absolute indicators of grain fracturing of varieties Rapan and Flagman did not allow us to select the best of them for cultivation. The range of fracture variability was higher in varieties Olymp and Apollon in Abinsk district. The stable varieties include Favorit and Krepysh when cultivated in two districts, Apollon and Olymp in Krasnoarmeysky district. According to the amylographic characteristics, variety Olymp in Abinsky district and Favorit in Krasnoarmeysky district were subjected to less variability. Studies on grain quality of varieties grown in agrolandscape zones of rice cultivation will be continued in order to create varietal complexes with optimal yield quality. The quality indicators will be included in the USF (Unique Scientific Facility) of All-Russian Rice Research Institute “Collection of genetic resources of rice, vegetables and melons" and the Databank “Parameters of grain quality of rice forms in breeding varieties".