There have been six times of severe heat damages happened to the mid-season rice in Yangtze River Valley (YRV), China during the past 50 years, with the latest one occurred in 2003. It was estimated that the involved acreage of rice in 2003 was about 3 million ha, with a loss of about 5.18 million rice grain yields. The serious heat stress situation in YRV might be closely correlated with the c...

title: Screening of rice cultivars for grain Arsenic concentration and

BACKGROUND Introgression plays an important role in evolution of plant species via its influences on genetic diversity and differentiation. Outcrossing determines the level of introgression but little is known about the relationships of outcrossing rates, genetic diversity, and differentiation particularly in a weedy taxon that coexists with its conspecific crop. METHODOLOGY/PRINCIPAL FINDING...

With the decreasing trend in rice consumption in Japan, breeding for new types of rice plant, which is a major responsibility of breeders has also become a political issue. The need for restoring Japanese agriculture and maintaining self-sufficiency in rice production has always been tightly linked to economic partnership agreements and trade liberalization. As a result, rice production has bee...

Inflorescence architecture is a key agronomical factor determining grain yield, and thus has been a major target of cereal crop domestication. Transition from a spread panicle typical of ancestral wild rice (Oryza rufipogon Griff.) to the compact panicle of present cultivars (O. sativa L.) was a crucial event in rice domestication. Here we show that the spread panicle architecture of wild rice ...

Upland rice is typically grown under slash-and-burn systems in the mountainous regions of northern Laos by resource-poor farmers for subsistence. Upland rice cultivars are all traditional and no fertilizer inputs are used. In these systems, grain yields average only 1.7 t/ha. A multi-site experiment was conducted in Luang Prabang province to examine cultivar and fertilizer effects on grain yiel...

Clay H. Sneller Department of Agronomy, University of Arkansas, Fayetteville, AR 72701. Present address: Ohio Ag Resources and Development Center, Department of Horticulture and Crop Science, 1680 Madison Ave., Wooster, OH 44691 Red rice is a major weed in rice production in the southern United States. Red rice and rice intercross because they are the same species. Our objectives were to determ...

rice (oryza sativa), a salt-sensitive species, has considerable genetic variation for salt tolerance within cultivars. to evaluate salinity effects on growth, chlorophyll content and ion uptake of two rice genotypes (ir29 and ir651, sensitive and tolerant respectively) accompany with two semi-tolerant iranian rice cultivars in a green house experiment were grown in normal condition till 6th lea...

In 1966, IRRI released IR8, the first high-yielding modern rice cultivar for the irrigated tropical lowlands. Since the release of IR8 in 1966, 42 additional indica rice (Oryza Since then, the primary emphasis of rice improvement sativa L.) cultivars developed by the International Rice Research Institute (IRRI) for the irrigated and favorable rainfed lowlands have has been directed towards inco...

Sucrose synthase activity in rice is potentially yield limiting. Earlier research indicated that endosperm sucrose synthase activity during grain filling was higher in ‘Guichao’ rice than in U.S. rice cultivars. We set about to purify sucrose synthase from Guichao endosperm as part of an overall research effort to understand the physiological reasons for the high yields of Guichao compared to U...