01153nam a2200181Ia 4500 CTU_159931 210402s9999 xx 000 0 und d 633.18 I.65 IR varieties and their impact G.S. Khush, P.S. Virk Philippines International rice research institute (IRRI) 2005 Rice scientists, journalists, and historians often search for information on Green Revolution varieties of rice. In this sourcebook, World Food Prize Laureate, Dr. Gurdev S. Khush, and premier IRRI plant breeder, Dr. Parminder S. Virk, summarize the available information on 34 IR varieties. The book lists 328 IR breeding lines released as 643 varieties in 75 countries, irrespective of geographic location or ideology. It is estimated that 60 percent of the world rice area today is planted to IRRI-bred varieties or their progenies. Agricultural research,Plant breeding,Rice,Lúa,Nghiên cứu trong nông nghiệp,Nhân giống cây trồng Duyen, Trọng Hiếu Trung tâm Học liệu Trường Đại học Cần Thơ