Trait collection of rice by resistance to rice blast

Abstract

Aim. To study the genetic diversity of rice in terms of resistance to disease, to find sources of resistance, to select reference varieties and to form a trait collection of rice accessions with resistance to Pyricularia oryzae Cav. Results and Discussion. The study was carried out in an infectious-provocative nursery in the field and greenhouse of the Institute of Rice in compliance with the methodical guidelines in 2003 – 2016. In of the south Ukrainian, Pyricularia oryzea is the most harmful for rice. The article presents the results on forming a trait collection studying rice accessions. It presents the results of 7-year studies (2010 – 2016) on the search for sources for resistance to the pathogen among 190 rice accessions of different eco-geographical origin. In the years with various meteorological conditions and various development of disease, we revealed several sources of resistance to the pathogen. There were 64 disease-resistant accessions (33,7 %). Most of the accessions under investigation were medium-resistant to Pyricularia oryzae (50,5%). In the period of 2003 – 2004 and 2007 – 2009, 58 rice accessions were studied on artificial infection. In the greenhouse, 19 (33,7%) resistant accessions were found. Most of the accessions under investigation were susceptible (46,6%) and medium-resistant to Pyricularia oryzae (20,7 %). Conclusions. The trait collection comprising 58 accessions belonging to 13 varieties from 8 foreign countries has been formed. Reference varieties and sources of resistance to disease in combination with a set of economic features were defined. These accessions are of great interest to breeding for valuable agronomic traits as they combine resistance to disease with several economically valuable characteristics. The collection is of great importance for achieving different scientific and breeding objectives. All the valuable material will be transferred for introduction in breeding.