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以1芽6、7叶新梢为原料制作砖茶，并对初制各个工序的主要生化成分含量和含氟量进行了分析。结果表明，在初制工序中，含水量、水浸出物、蔡多酚与儿茶素、叶绿素含量均呈下降趋势，氨基酸含量在渥堆的过程略有上升，但是在干燥的过程明显下降，与可溶性糖的变化规律相似。茶黄素（TF）含量逐渐增加，茶红素（TR）与茶褐素（TB）变化不规律性。氟含量在整个初制过程中变化不大，表明初制过程对含氟量影响不大。感官审评结果表明，所用原料制作砖茶品质优于传统砖茶。 相似文献
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研究旨在鉴定筛选优良雨花茶适制品种,为茶树良种引进和雨花茶品质提升提供技术支撑。对南京市6 个主栽茶树品种制作雨花茶的氨基酸、茶多酚、水浸出物、咖啡碱、酚氨比、外形、汤色、香气、滋味和叶底等农艺性状进行综合比较,结合品质成分分析和感官审评结果,研究不同品种雨花茶适制性及其呈味特征。感官审评结果表明,不同品种制成的雨花茶总分依次为‘龙井43’>‘苏茶早’>‘迎霜’>‘浙农117’/‘锡茶5号’>‘乌牛早’,其中‘龙井43’的香气、滋味、汤色得分均高于其他品种。品质成分分析表明,不同品种原料对雨花茶的水浸出物含量、咖啡碱含量影响较小,对茶多酚含量、GA含量、儿茶素组成、氨基酸含量及其组成有着较大影响,‘龙井43’的茶多酚总量显著高于其他5个茶树品种,没食子酸(GA)、儿茶素(C)、表没食子儿茶素没食子酸酯(EGCG)、酯型儿茶素含量和儿茶素总量也均排在首位。呈味特征研究认为,雨花茶的滋味特征多由具有苦涩味的儿茶素类决定;茶汤中鲜味氨基酸仅谷氨酸达到鲜味阈值,而GA浓度远高于其阈值(0.034 mg/mL),认为GA是雨花茶鲜爽滋味的关键因素之一。此外,茶多酚含量最高的‘龙井43’还表现出最强的DPPH自由基清除活性,其IC50仅为26.65 μg/mL,抗氧化活性最强。综上,‘龙井43’用于制备雨花茶具备一定的优势,从而为茶树良种引进和雨花茶品质提升提供技术参考。 相似文献
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瓮安白茶是以珍稀茶树品种"白叶一号"的芽叶为原料,精细加工制作而成。为保证该茶的品质,在茶树种植、茶园管理及茶叶加工等多个环节都遵照有机茶的标准执行,并逐渐形成一套完整的生产工艺。 相似文献
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为研究不同茶树品种对滇红碎茶品质的影响,以国家级茶树良种‘云抗10号’为对照,选取省级茶树新品种‘云茶红1号’、‘云茶红2号’和‘云抗12号’3个茶树新品种为试验对象,按照统一采摘标准及加工方法制成手工滇红碎茶,比较主要生化成分测定结果和感官审评结果。结果表明：3个茶树新品种茶样的内含物质丰富,生化成分比例协调;感观审评5项因子的评分结果有2个品种比对照高,得分从高到低依次为‘云抗12号’、‘云茶红2号’、‘云抗10号’、‘云茶红1号’,说明3个茶树新品种均可作为生产滇红碎茶的选用品种,尤其以‘云抗12号’、‘云茶红2号’为宜。 相似文献
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《农产品加工．学刊》2016,(5)
将葛叶和茶树芽叶,按春季2∶3质量比、夏季3∶2质量比进行复合,并应用自然萎凋→机械匀叶→热风萎凋→加压揉捻→振动解块→程控发酵→炒干滚形→电热制形→电磁固形→风选去杂→微波提香等工艺制作研究葛叶复合红茶及其加工方法。该工艺制成的葛叶复合红茶外形呈弯钩状,色泽乌润光亮,冲泡后汤色红黄清亮,不但含葛叶清香和红茶甜香,而且滋味鲜爽醇厚、回味甘甜,具有独特的葛茶品质风味,是一种大众化营养保健饮品。如此,不但加强了葛与茶植物资源高效利用,而且还可促进国家增税、企业增效、农民增收。 相似文献
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Jens Jensen 《Euphytica》1979,28(1):47-56
Summary The high-lysine gene in Risø mutant 1508 conditions an increased lysine content in the endosperm via a changed protein composition, a decreased seed size, and several other characters of the seed. The designation lys3a, lys3b, and lys3c, is proposed for the allelic high-lysine genes in three Risø mutants, nos 1508, 18, and 19. Linkage studies with translocations locate the lys3 locus in the centromere region of chromosome 7. A linkage study involving the loci lys3 and ddt (resistance to DDT) together with the marker loci fs (fragile stem), s (short rachilla hairs), and r (smooth awn) show that the order of the five loci on chromosome 7 from the long to the short chromosome arm is r, s, fs, lys3, ddt. The distance from locus r to locus ddt is about 100 centimorgans. 相似文献
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Hongyan WEI Jian ZHOU Jinguang LU Jingzheng SONG Qiongxi YU Zhihong JIANG 《Medicinal Plant》2019,(6):27-29
[Objectives]This study aimed to establish a QAMS(quantitative analysis of multi-components by single-marker)method for simultaneous determination of four phenol... 相似文献
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Summary Apple and pear pollen was irradiated with doses of 0, 50, 100, 250 and 500 krad (gamma rays) and stored at 4°C and 0–10% r.h. From the in-vitro germination percentages an average LD 50 dose of about 220 krad was estimated. For both irradiated and untreated pollen a close and corresponding lineair relationship existed between germination percentage and pollen tube growth.Irradiated pollen was much more sensitive to dry storage conditions than untreated pollen, resulting in less germination and more bursting. Apparently, irradiation caused the pollen cell membrane to lose its flexibility faster than normal. Rehydration of dry-stored, irradiated pollen in water-saturated air restored germination percentages up to their initial levels. The importance of this procedure in germination trials is stressed. 相似文献
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Richard N. Lester 《Euphytica》1989,44(1-2):125-132
Summary An hypothesis is developed that the rapid change from wild plants into domesticated crops principally involves the selection of alleles with non-functional gene products which leads to reduced control of the highly integrated metabolism and morphogenesis previously accumulated by lengthy natural selection. Such disturbance of the genome produces altered physiological and morphological development which, although deleterious in nature, serves mankind better and has been selected. 相似文献
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B. Julier P. Guy C. Castillo-Acuna G. Caubel C. Ecalle M. Esquibet V. Furstoss C. Huyghe C. Lavaud A. Porcheron P. Pracros G. Raynal 《Euphytica》1996,91(2):241-250
Summary Twenty-five lucerne populations of the Medicago sativa complex, which were either diploid or tetraploid and wild or cultivated, were analysed for their resistance to four different fungal diseases and to stem nematode. Forage quality, including stem digestibility and saponin content, was also tested.Populations varied in susceptibility to the diseases caused by Colletotrichum trifolii, Verticillium albo-atrum, Sclerotinia trifoliorum and Pseudopezizza medicaginis, and to the nematode Ditylenchus dipsaci. Except for Sclerotinia rot, sativa and falcata subspecies differed in susceptibility, but this grouping of populations did not account for the full range of variation among them. However, the resistance to P. medicaginis was much lower in the sativa than in the falcata populations.Populations also varied significantly in stem fiber content and digestibility. Stem digestibility was negatively correlated to forage yield. Wild sativa and falcata populations had lower fiber content and higher digestibility than cultivated sativa populations. The medicagenic acid was the sapogenin responsible for the anti-nutritional effect of the lucerne measured by the yellow mealworm larvae Tenebrio molitor. The medicagenic acid content was lowest for the pure sativa populations, highest for the pure falcata populations, and intermediate for the French sativa varieties that have some traits originating from falcata germplasm. Some populations could be used in breeding programs to improve disease and nematode resistance, and forage quality. 相似文献
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In order to explore the pharmacological effects of active components of Gastrodiae Rhizoma on the central nervous system,through consulting related literatures,... 相似文献
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[Objectives]The purpose of this study was to investigate the effects of Pb on rhizosphere soil enzyme activity and chemical constituents of Achyranthes bidentat... 相似文献
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不同P-Zn配比对小麦幼苗微量元素营养的影响 总被引：2，自引：0，他引：2
采用了螯合-缓冲营养液培养方法对小麦进行了苗期培养试验,在3个P水平(0,0.6,3.0 mmol/L)和3个Zn水平(0,3,30 μmol/L)的完全组合下对小麦苗期生长及Zn、Fe、Cu、Mn营养进行了研究,旨在为小麦微肥施用提供理论依据.结果表明,P、Zn的正常供应促进了小麦生长,二者的缺乏与过量均会抑制小麦发育,且这种影响在冠部表现得更为明显.在小麦苗期,Zn与Cu的吸收存在明显的拮抗作用,但供Zn则促进了Zn和Cu的转运,而Mn转运则受到了抑制;过量供Zn时,大量Zn被转运到冠部,同时明显抑制了(Fe+Cu+Mn)的吸收总量;P的供应显著地抑制了Fe的吸收,但P的供应提高了Zn、Cu、Mn的转运率;P、Zn在对Zn与Fe、Cu、Mn间吸收竞争的影响中,Zn本身的影响要比P的影响更为明显,供Zn明显促进了小麦幼苗对Zn的吸收;在小麦幼苗冠部,Zn与Fe的竞争中,供P利于Zn的吸收,缺P则利于Fe的吸收;而Zn与Cu以及Zn与Mn间的竞争中,缺磷时利于Zn的吸收,供磷后则利于Cu和Mn的吸收.总之,小麦幼苗Zn、Fe、Cu、Mn营养中,P、Zn的不同配比会不同程度地改变Zn与Fe、Cu、Mn的协同或拮抗效应. 相似文献
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Summary
Glycine tabacina (Labill.) Benth. is a wild perennial species related to the cultivated soybean, G. max (L.) Merr. It is composed of diploid (2n=40) and tetraploid (2n=80) cytotypes. Currently, to differentiate the cytotypes, plants are grown out in the greenhouse and chromosome counts made on pollen mother cells. It is a laborious and time consuming process. The objective of this study was to determine whether electrophoretic techniques could be utilized to separate the cytotypes. Electrophoretic examination of seven isozyme systems from seed of 67 G. tabacina accessions revealed banding patterns that could be used to differentiate between diploid and tetraploid cytotypes in the species. Among the tetraploid accessions, the number of bands observed were always greater than the diploids. Some tetraploid banding patterns consisted of bands similar to the diploid tabacina and/or additional bands previously identified in other Glycine species. The patterns of isozyme multiplicity and variation in the tetraploid tabacinas suggests more than one mode of origin for the tetraploids. 相似文献
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Summary Some photosynthetic characters as-leaf anatomy, leaf photosynthetic rate and CO2 compensation pointdistinguishing C3 and C4 plants and physiological characters as leaf area ratio, nitrogen content, leaf stem ratio and total shoot-to-root and deep root-to-shoot ratios have been studied in rice × sorghum and rice × wheat hybrids. Rice × sorghum 1. has lower values of photosynthetic rate, leaf nitrogen, total root and deep root-to-shoot ratio and CO2 compensation point as of rice parent where as, rice × sorghym 2. is superior in all these characters. Both hybrids lack kranz anatomy. Though both rice × sorghum hybrids show characters of C3 rice plant but rice × sorghum 2. has improved drought tolerance and leaf characters in relation to yield. Rice × wheat hybrid have higher assimilatory area and higher total root-to-shoot ratio. Grains of rice × wheat hybrids are identical to rice grain. However, as grains of rice × wheat hybrid does not contain seed coat, it could be exploited as novel rice germplasm after improvement.Abbreviations T
CO2 compensation point
- T21
CO2 compensation point at 21% O2
- T2
CO2 compensation point at 2% O2
- dR/sR
deep Root-to-shoot Ratio
- LAR
Leaf Area Ratio
- CER
photosynthetic rate
- TR/SR
Total Root-to-Shoot Ratio 相似文献