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Agricultural Sciences in China 2003年第4期2卷 377-383页

作者： QIUXin-mian ZHOUWen-long cropresearchinstitute ZhejiangAcademyofAgriculturalSciencesHangzhou310021P.R.China ZhejiangInstituteofSciencesandTechnology Hangzhou310012P.R.China

The genetic control of fiber pigment color in naturally colored cotton was studied. The expression of brown and green fiber color was controlled by incompletely dominant single genes and incompletely dominant major genes, respectively. Production and accumulation of the fiber pigment were related to special expression of enzymatic genes for pigment synthesis in fiber cells. At the stage of fiber lengthening, naturally colored cotton, like white cotton, appeared purely white. But when fiber cell walls entered the thickening stage, pigment appeared by degrees. When the fiber was completely matured (on boll dehiscence), the color reached its darkest level. After wetting process treatment, the hues of the fiber pigment changed in regular patterns. The hue circle for brown and green cotton changed in the opposite direction with wetting process treatment. In general, the treated cotton color and luster became dark and vivid, and this trend provided the possibility for enhancing the fiber quality by suitable environmental friendly finishing. The analysis showed that the color and luster of the cotton may be controlled by a series of pigments which show different chemical performance.

关键词： Naturally colored cotton Fiber pigment Genetics Wetting process

Variation of Starch Property and Its Relationship with Dry White Chinese Noodle Quality in Common Wheat

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Agricultural Sciences in China 2003年第1期2卷 1-7页

作者： LIUJian－jun HEZhong－hu YANGJin XUZhao－hua LIUAi－feng ZHAOZhen－ CIMMYTChinaOffice Beijing100081P.R.China cropresearchinstitute ShandongAcademyofAgriculturalSciencesJinan250100P.R.China InstituteofCropBreedingancCultivation ChineseAcademyofAgriculturalSciences

In total, 185 wheat cultivars and lines from major Chinese wheat regions, Australia and USA in two trials, sown in four and two environments, respectively, were used to investigate starch property and its relationship with dry white Chinese noodle (DWCN) quality. Significant variations were observed in all starch parameters and DWCN quality. High pasting viscosity cultivars include Sunstate, Hartog, Eradu, Cunning-han, Gamenya, Karl92, Sunco, Yangmai5, Yangmail58, Mianyang26, Een1, Yumai41, Yumai49, Zheng81-1, Yumai54, Yumai2. Yumai47, Lu955159, Lumai15, Lumai21, Shaanyou225, Guanfeng2, Ji5099, Bainong4, and Jinmai2. Wheats from Australia, USA, South China Autumn-sown Spring Wheat Region and Yellow and Huai Valley showed better starch properties and DWCN quality than those from North China Plain. High peak viscosity, breakdown and flour swelling volume were significantly associated with good DWCN quality. A relatively high frequency of Wx-B1 null alleles was detected in Chinese wheats. Cultivars with null for Wx-Bl GBSS performed higher pasting viscosity and flour swelling volume, and better DWCN quality than normal type.

关键词： Bread wheat Pasting viscosity Flour swelling volume GBSS Chinese noodle

Mathematic Models for Analysis of Quality Components in Sugarcane Juice with Fourier Transform Near Infrared Spectroscopy

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Agricultural Sciences in China 2003年第2期2卷 190-194页

作者： CAOGan TANZhong－wen 等 cropresearchinstitute GuangdongAcademyofAgriculturalSciencesGuangzhou510640PR.China CollegeofAgronomy SouthChinaAgriculturalUniversityGuangzhou510642.P.R.China

With the technique of Fourier transform near infrared (FT-NIR) spectroscopy, the calibration models for quantitative analysis of sucrose and polarization in sugarcane juice were developed by using transmission mode and calibrating with partial least square (PLS) algorithm. The determination coefficients (R2) of the predicted models for sucrose and polarization in juice were 0. 9980 and 0. 9979 respectively; the root mean square errors of cross validation (RMSECV) were 0. 143 and 0. 155% for sucrose and polarization in juice respectively. The predictive errors measured by FT-NIR were close to those by routine laboratory methods. The results demonstrated that the FT-NIR methods had high accuracy and they were able to replace the routine laboratory analysis. It was also demonstrated that as a rapid and accurate measurement, the FT-NIR technique had potential applications in quality control of mill sugarcane, establishment of payment system based on sugarcane quality, and selection of clones in sugarcane breeding.

关键词： Fourier transform near infrared spectroscopy Quantitative analysis Sugarcane Sucrose

In Vitro Selection and Identification of Drought-Tolerant Mutants in Sweetpotato

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Agricultural Sciences in China 2003年第12期2卷 1314-1320页

作者： WANGYu-ping LIUQing-chang LIAi-xian ZHAIHong ZHANGSong-shu LIUBao-li KeyLaboratoryofCropGenomicsandGeneticsImprovement MinistryofAgriculture／BeijingKeyLaboratoryofCropGeneticImprovementChinaAgriculturalUniversityBeijing100094P.R.China cropresearchinstitute ShandongAcademyofAgriculturalSciencesJinan250100P.R.China InstituteofCerealandOilCrops HebeiAcademyofAgriculturalandForestrySciencesShijiazhuang050031P.R.China

In vitro selection of drought-tolerant mutants in sweetpotato cv. Lizixiang was studied by using PEG6000 as selection stress. Embryogenic suspension cultures were cultured in MS medium containing 035% PEG6000 and 2 mg L 1 2,4-dichlorophenoxyacetic acid (2,4-D). The results indicated that 30% PEG6000 can be used for the optimal selection stress of drought-tolerance. Embryogenic suspension cultures irradiated with 80 Gy gamma-ray were cultured in MS medium containing 30% PEG6000 and 2 mg L 1 2,4-D and 20 drought-tolerant cell aggregates were obtained. These cell aggregates were transferred to solid MS me- dium supplemented with 2 mg L 1 2,4-D and formed embryogenic callus with somatic embryos. The embryogenic callus with somatic embryos was further transferred to MS medium supplemented with 1 mg L 1 abscisic acid (ABA), resulting in the germination of somatic embryos. In this study a total of 18 regenerated plants were obtained. The regenerated plants were transplanted in a greenhouse and 11 lines were formed. The analysis on drought treatment of seedlings, water retaining capacity of leaves and coefficient of drought-tolerance showed that 3 lines had significant drought-tolerance in comparison with the control plants.

关键词： Sweetpotato Drought-tolerant mutants In vitro selection Identification

Molecular Mapping of QTLs for Cold Tolerance at the Budburst Period in Rice

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Agricultural Sciences in China 2004年第11期3卷 801-806页

作者： QIAOYong-li HANLong-zhi ANYong-ping ZHANGYuan-yuan CAOGui-lan KohHee-jong CollegeofAgronomy NorthwestSci-TechUniversityofAgricultureandForestryYangling712100P.R.China InstituteofCropGermplasmResources ChineseAcademyofAgriculturalSciencesBeijing100081P.R.China cropresearchinstitute NingxiaAcademyofAgricultureandForestrySciencesYinchuan750105P.R.China SchoolofPlantScience CollegeofAgricultureandLifeScienceSeoulNationalUniversitySuwon441-744Korea

The quantitative trait loci (QTLs) for cold tolerance at the budburst period (CTBP) was identified using a F2:3 population including 200 lines derived from a cross of indica and japonica Milyang 23/Jileng 1. A molecular linkage map of 97 SSR markers was constructed using interval mapping and covered a total length of 1 357.3 cM with an average distance of 13.99 cM, between adjacent markers in rice genome. The CTBP of F3 lines was evaluated at 5℃, and the survival seedling rate after treating under low temperature at the budburst period was used as cold tolerance index for CTBP. A continuous distribution near to normal for CTBP was observed in F3 lines, CTBP is a quantitative trait which was controlled by some genes. Three QTLs on chromosomes 2, 4 and 7 which are associated with CTBP were detected on location of RM6-RM240, RM273-RM303, RM214-RM11, respectively, which explained the range of the observed phenotypic variance from 11.5 to 20.5%. qCTBP4 detected on RM273-RM303 of chromosome 4 explained 20.5% of the observed phenotypic variance. The effect of qCTBP4’s allelic gene comes from Jileng 1., MSc; Correspondence

关键词： Rice Cold tolerance at the budburst period (CTBP) Microsatellite marker QTL