| [sequence analysis of ran4 of a severe isolate of rice stripe virus in china]. | rna4 segment of a severe isolate of rice stripe virus, isolated from liaoning province and designated as pj isolate, was amplified, cloned and sequenced. rna4 of pj isolate had 2157 nucleotide in length. when compared with rna4 of t and m isolates of japan and cx isolate of yunnan province of china that had been previously reported, we found that these four isolates could be divided into two groups. pj, t and m isolates shared 97.0% and 97.0%-97.5% identities in vorf4 and vcofr4 at the nucleotid ... | 2001 | 12549184 |
| [effects of intermittent irrigation on ecological and physiological water requirement of rice in north china]. | the ecological and physiological water requirement of rice was studied in a paddy field of north china, and the field experiment was conducted at shenyang experimental station of ecology, chinese academy of sciences. under continuous flooding irrigation (csf) and intermittent irrigation (it) conditions, the evapotranspiration and soil evaporation of paddy fields were measured by non-weighing lysimeters and micro-lysimeters, respectively. the results showed that compared with continuous flooding ... | 2004 | 15624834 |
| [analysis of paddy field evapotranspiration in north china and calculation of crop coefficient]. | the potential evapotranspiration (et0) values from 1951 to 2002 for the lower reaches of liaohe plain, north china, were estimated by penman-monteith equation, and the annual change in et0 was analyzed. by using non-weighting lysimeters at shenyang experimental station of ecology (cas) in north china, the daily evapotranspiration of flooded rice (oryza sativa l.) at the interval of 10-11 days was determined for eight seasons from 1993-2002 (except for 1997 and 1999). the results showed that the ... | 2005 | 15852960 |
| [stress-resistance of weedy rice luolijing (oryza sativa)]. | weedy rice luolijing (oryza sativa) is generated in dandong, liaoning province of northeast china. its plant height is taller than normal planted rice varieties, and its caryopsis is medium or long in size, which dropped easily after matured. the color of the caryopsis shell is straw-like or yellow alternated with black-gray. the spikelet is with or without awns, and the length of the awns is 2-12 cm. the 1000 caryopsis weight is 23.5 g, and the hull is nacarat. the seed germination rate at 13-3 ... | 2005 | 16011174 |
| genetic diversity and population differentiation of liaoning weedy rice detected by rapd and ssr markers. | weedy rice refers to populations of usually annual oryza species that diminish farmer income through reduction of grain yield and lowered commodity value at harvest. the genetic diversity and population genetic structure of weedy rice in liaoning province were studied by rapd and ssr markers. the results indicate that the level of genetic diversity of liaoning weedy rice is very low, with polymorphic loci being only 3.70% (rapds) and 47.62% (ssrs). on the other hand, high genetic differentiation ... | 2005 | 16144303 |
| genetic diversity and origin of weedy rice (oryza sativa f. spontanea) populations found in north-eastern china revealed by simple sequence repeat (ssr) markers. | weedy rice (oryza sativa f. spontanea) is one of the most notorious weeds occurring in rice-planting areas worldwide. the objectives of this study are to determine the genetic diversity and differentiation of weedy rice populations from liaoning province in north-eastern china and to explore the possible origin of these weedy populations by comparing their genetic relationships with rice varieties (o. sativa) and wild rice (o. rufipogon) from different sources. | 2006 | 17056615 |
| [revaluation of soil heavy metals pollution in zhangshi irrigation area of shenyang and analysis of cd forms in soil]. | this paper revaluated the situation of cadmium (cd) pollution in rice field soils of zhangshi irrigation area in shenyang. the results indicated that the soil cd pollution of test area was still quite serious. the cd content in brown rice samples ranged from 0.435 to 0.855 mg x kg(-1), which exceeded the national criteria for food sanitation in china, and increased by 335%-755% compared with that 20 years ago. brown rice cd had a significant negative correlation with soil ph, and a positive corr ... | 2007 | 18062327 |
| environmental fate of syp-1924 residues in rice field. | syp-1924 is a new kind of herbicide developed by shenyang scicncreat chemicals. this study has been carried out to investigate the environmental fate of syp-1924 in rice-field system. an analytical method utilizing high-performance liquid chromatography (hplc) with ultraviolet (uv) detection was described for the determination of new kind of herbicide syp-1924 in rice, rice straw, soil and water. the dissipation of syp-1924 in soil, water and rice straw was determined using the proposed method. ... | 2010 | 20449722 |