Received: 26-11-2013 / Accepted: 04-01-2014
The pure-line rice variety Huong Com 4 (HC4) was selected from introduced MHV population by pedigree method. It is a temperature sensitive , early maturing (105-100 days in summer crop, 125-140 days in spring crop), with good phenotype, i.e. semi-dwarf, sturdy culms and small V-shaped leaves. HC4 is resistant to bacterial leaf blight disease, but slightly susceptible to blast, sheath blight and brown plant hopper. HC4 is suitable to late Spring, early Summer and Summer-Autumm cropping seasons in nothern Vietnam. The variety shows stable yield and high quality. In the variety trials HC4 gave yield in the range from 4.5 to 7.0 tons per hectare, higher than the check variety Bacthom 7. HC4 has good quality, i.e. slender and long grain, high head rice percentage, medium amylose content (17.9-18.5%), acceptable protein content (7.9-8.2%) and good cooking quality.