26 A study was conducted to investigate the accumulation and distribution of arsenic in 27 different fractions of rice grain (Oryza sativa L.) collected from arsenic affected area of 28 Bangladesh. The agricultural soil of study area has become highly contaminated with 29 arsenic due to the excessive use of arsenic-rich underground water (0.070±0.006 mg l, 30 n=6) for irrigation. Arsenic conten...

A study was conducted to investigate the accumulation and distribution of arsenic in different fractions of rice grain (Oryza sativa L.) collected from arsenic affected area of Bangladesh. The agricultural soil of study area has become highly contaminated with arsenic due to the excessive use of arsenic-rich underground water (0.070+/-0.006 mg l(-1), n=6) for irrigation. Arsenic content in tiss...

Rice blast disease caused by Magnaporthe oryzae is one of the most destructive disease causing huge losses to rice yield in different parts of the world. Therefore, an attempt has been made to find out the resistance by screening and studying the genetic diversity of eighty released rice varieties by National Rice Research Institute, Cuttack (NRVs) using molecular markers linked to twelve major...

The Northeastern region of India including Asom is one of the core area widely recognized as the centre of origin of rice germplasm. It is the largest region exceptionally rich in the rice genetic diversity. The physiographic and agroecological conditions vary in Asom very widely. The physical features, geographical isolation and historical realities have made the state an area of unique ethnic...

Transfer of genetic traits from wild or related species into cultivated rice is nowadays an important aim in rice breeding. Breeders use genetic crosses to introduce desirable genes from exotic germplasms into cultivated rice varieties. However, in many hybrids there is only a low level of pairing (if existing) and recombination at early meiosis between cultivated rice and wild relative chromos...

Genetic diversity and the relationship among nine japonica rice groups consisting of 288 landraces and varieties in different geographical origins of Northeast Asia (China, Japan, Korea, Democratic People's Republic of Korea) and the Russian Far East district of the Russian Federation were evaluated with 154 simple sequence repeat (SSR) markers. A total of 823 alleles were detected. The observe...

A glass house experiment was conducted to investigate the effect of soil arsenic on photosynthetic pigments, chlorophyll-a and -b, and their correlations with rice yield and growth. The experiment was designed with three replications of six arsenic treatments viz. control, 10, 20, 30, 60, 90 mg of As kg(-1) soil. Arsenic concentration in initial soil, to which the above mentioned concentrations...

Rice stripe virus (RSV) is one of the most destructive viruses of rice, and greatly reduces rice production in China, Japan, and Korea, where mostly japonica cultivars of rice are grown. RSV is transmitted by the small brown plant-hopper (SBPH) in a persistent and circulative-propagative manner. Several methods have been developed for detection of RSV, which is composed of four single-stranded ...

Using data collected from 400 farming households in the Casamance area of Senegal, the paper demonstrates that not only farm and farmers' characteristics, but also farmers' perceptions of technology-speci®c characteristics, signi®cantly in ̄uence adoption decisions relating to improved rice varieties. Farmers' perceptions about improved rice varieties were quanti®ed using a quasi-arbitrary ordin...

Rice (Oryza sativa) was cultivated by Asian Neolithic farmers >11,000 years ago, and different cultures have selected for divergent starch qualities in the rice grain during and after the domestication process. An intron 1 splice donor site mutation of the Waxy gene is responsible for the absence of amylose in glutinous rice varieties. This mutation appears to have also played an important role...