共查询到20条相似文献,搜索用时 62 毫秒
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Many major genes of agricultural importance and quantitative trait loci (QTL) controlling yield components in rice have been mapped with molecular markers. The genetic distances between some of the genes and the markers are less than 5cM and the markers are on both flanks of some of the genes, which have laid down the foundation for marker-asslsted selection (MAS) in rice breeding. 相似文献
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L. Zhang J. F. Guenthner R. B. Dwelle J. C. Foltz 《American Journal of Potato Research》1999,76(5):297-304
International trade of processed potatoes, especially frozen french fry exports, has become an important part of the US potato industry. In China, one of the world’s biggest potato producing countries, consumption of US frozen french fries has significantly increased since the late 1980’s. By employing economic theory and econometric techniques, this study evaluates China’s current frozen french fry market and predicts its future development. Export demand models are developed for US frozen french fries in Greater China (Mainland China, Hong Kong, and Taiwan). The study finds that US foreign direct investment and fast food restaurants in China have great influence on the market demand for US frozen french fries. Other variables in the model include price of US frozen french fry exports, consumer income, population, price of substitutes, and trade barriers. The study forecasts that Mainland China’s frozen fry imports will exceed Taiwan and Hong Kong after year 2000. In 2005, US frozen french fry exports will increase to 227,000 tons to China, and 454,000 tons to Greater China. Although there may be some challenges, China’s market provides opportunities for the US potato industry. 相似文献
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American Journal of Potato Research - 相似文献
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ZHUYingguo YUJinhong ZHANGXiaoguo 《中国水稻研究通报》1996,4(4):1-1
A male sterile mutant plant was found from the rice field of the local rice variety which was cultivated for a long time in the west of Hubei Province. The plant has more vigorous tillering ability. Its plant height of 95 cm was a bit shorter than that of the normal ones. 相似文献
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《中国水稻研究通报》1997,(2)
Many major genes of agricultural importanceand quantitative trait loci (QTL) controllingyield components in rice have been mappedwith molecular markers. The genetic distancesbetween some of the genes and the markers areless than 5cM and the markers are on both 相似文献
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Expansion of dough and hence bread making performance is postulated to depend on a dual mechanism for stabilization of inflating gas bubbles. Two flours were used in this study, one from the wheat variety Jagger (Jagger) and the other from a composite of soft wheat varieties (Soft). Thin liquid lamellae (films), stabilized by adsorbed surface active compounds, act as an auxiliary to the primary gluten–starch matrix in stabilizing expanding gas cells and this mechanism operates when discontinuities begin to appear in the gluten–starch matrix during later proving and early baking stages. Contributions of the liquid lamellae stability to dough expansion were assessed using flours varying in their lipid content. Incremental addition of natural lipids back into defatted flour caused bread volume to decrease, and, after reaching a minimum, to increase. Strain hardening is a key rheological property responsible for stabilizing the primary gluten–starch matrix. Jagger gave higher test-bake loaf volume than Soft and higher strain hardening index for dough. The different lipid treatments were found to have negligible effects on strain hardening index. Image analysis of crumb grain revealed that differences in number of gas cells and average cell elongation with different lipid treatments were insignificant. The evidence agrees with a dual mechanism to stabilize the gas cells in bread dough. To understand dough rheology at a molecular level, rheological properties of doughs were varied by addition of flour protein fractions prepared by pH fractionation. Fractions were characterized by SE-HPLC and MALLS. The molecular weight distribution (MWD) of fractions progressively shifted to higher values as the pH of fractionation decreased. Mixograph dough development time paralleled the MWD. However, the strain hardening index and the test-bake loaf volume increased with increasing MWD up to a point (optimum), after which they declined. At a given strain rate, the behavior at the optimum is thought to result from slippage of the maximum number of statistical segments between entanglements, without disrupting the entangled network of polymeric proteins. Shift of MWD to molecular weight higher than the optimum results in a stronger network with reduced slippage through entanglement nodes, whereas a shift to lower molecular weights will decrease the strength of the network due to a lesser number of entanglements per chain. 相似文献
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Introgression lines(ILs)derived from interspecific crosses are a source of new genetic variability.A total of 55 ILs derived from two crosses Swarna×O.nivara IRGC81848(population A)and Swarna×O.nivara IRGC81832(population B)were characterized for yield and yield-related traits/QTLs.Segregation of 103 simple sequence repeat(SSR)markers associated with yield-related QTLs was studied.Population A showed an average of 12.6%homozygous O.nivara alleles and population B showed 10.6%.Interestingly,three SSR markers,RM223,RM128 and RM517,showed conspicuous pattern of segregation.The distribution of parental alleles at three loci RM223,RM128 and RM517 linked to yield-related traits was unique.These markers flanked to several yield-related QTLs.RM223,flanking to qyld8.3,was heterozygous in almost all the 55 ILs except in IL10-3S and IL131S.RM128 on chromosome 1 and RM517 on chromosome 3 were mutually exclusive in 46 out of 55 ILs.These 46 ILs showed either of the marker allele RM128 or RM517 from O.nivara but not both.IL166S had both RM128and RM517 from O.nivara and the other ILs showed homozygous Swarna allele at RM517 except IL65S.Population structure assigned the 55 ILs to three sub-populations based on their genomic diversity.IL65S,IL166S,IL248S,IL7K and IL250K showed high yields in multi-location trials,and IL248S was released for cultivation as DRRDhan 40. 相似文献
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Georgios Kallifatidis Dominic Hoepfner Tiphaine Jaeg Esther A. Guzmán Amy E. Wright 《Marine drugs》2014,12(4):2305-2307