Abstract

Changing climate conditions along with nutrient deficient soils adversely affect the environment and reduce rice production. Wild introgression lines derived from KMR 3 and O. rufipogon were evaluated in various environments to identify high yielding stress tolerant genotypes. DRR Dhan 74 (IET 30252) is a variety developed by IIRR, using parental lines from an Indian accession of Oryza rufipogon (IC22015/WR120) collected from Kerala, India, which was maintained at IIRR (erstwhile DRR) and was used as a donor parent. KMR 3, a restorer line for popular high yielding hybrid KRH 2 was used as recurrent parent and the variety was developed through advanced back cross breeding and selection. This short bold grain type variety is suitable for both normal irrigated and low soil phosphorous conditions in Kharif and Rabi seasons. An average yield of 7 t/ha under normal conditions with recommended dosage of fertilizers and 4.5 t/ ha under low Phosphorus condition was reported under AICRPR multi location trials. Variety possesses good cooking quality with short bold grain type and higher yield and moderately resistant reaction to leaf blast, neck blast, sheath rot and plant hoppers. It was released for cultivation in Karnataka, Maharashtra, Telangana and Jharkhand through Central Sub-committee on Crop Standards, Notification and Release of Varieties for Agricultural Crops vide S.O. 4027(E) dated 8th Oct 2024, CG-DL-E-14102024-257835.