两种胡萝卜外植体无性系培养比较研究

分别以具有潜在有利变异性状的胡萝卜的根及丛生芽为外植体,比较了不同外植体获得无性系的灭菌方法和分化增殖生根的激素配比.结果表明,不同外植体的灭菌方法差别较大:用肉质根做外植体时,促进产生愈伤组织效果最好的培养基为MS+6-BA 0.1 mg/L+2,4-D 0.1 mg/L,促进芽分化增殖效果最好的培养基为MS+6-B...     

胡萝卜肾形肾状线虫病的发生及药剂控制试验

从广东省番禺市胡萝卜根系及根际土分离到１种线虫,经鉴定为肾形肾状线虫,该线虫在胡萝卜的生长期内,以１０￣１１月份虫口密度最大,主要分布于０￣１５ｃｍ土壤层。该线虫危害胡萝卜,是国内胡萝卜上的１种新病害。药剂试验表明供试的几种杀线剂均对肾形肾状线虫有较好的控制作用,其中益舒宝复方Ｂ和Ｅ是值得生产上推广应用的杀线剂。     

中稻-胡萝卜一年两熟高产高效栽培技术

宁化县曹坊乡近年在不同海拔地块进行中稻—胡萝卜一年两熟高产示范栽培,取得全年产值约8000元/667m2的显著效益。介绍了中稻—胡萝卜一年两熟高产高效栽培技术。     

干燥温室与热泵联合系统对胡萝卜的干燥效果

为了解决传统蔬菜干燥技术成本高、能耗大的问题,该研究提出了一种干燥温室与热泵联合系统,基于试验地环境设计了干燥温室,采用三级串联的方式构建了组合式热泵机;测定了干燥温室内外太阳辐射和温度变化情况,以胡萝卜为试验材料,测定了联合系统性能指标,对比了独立热泵机组与联合系统的制热系数(Coefficient Of Perfo...     

甜橙-胡萝卜汁复合饮料加工工艺研究

以重庆甜橙和胡萝卜为原料,采用多次配方试验,研究其复合饮料的生产工艺和加工技术。结果表明,甜橙汁与胡萝卜汁的体积比为1:9,以35%的原汁含量和12%的可溶性固形物生产的复合饮料的营养物质损失较少,口味优良、品质俱佳。     

鲜切胡萝卜的真空预冷研究

研究了不同切片厚度与预冷终温对鲜切胡萝卜真空预冷效果的影响,分析了经过真空预冷和未经真空预冷的鲜切胡萝卜在贮藏期内的呼吸强度、失重率、色差和硬度的变化。结果表明,鲜切胡萝卜可比完整胡萝卜节省2/3的预冷时间;在切片厚度6 mm和预冷终温6℃时,鲜切胡萝卜的真空预冷效果最佳,失重率为1.3%、芯部温度1.5℃、预冷时间7.3 min。采用真空预冷处理方法可有效抑制鲜切胡萝卜贮藏期内的呼吸强度,降低失重率,保持其较好的感官品质。     

多维胡萝卜果酱的研制

本研究系采用胡萝卜、山楂等为原料,按一定比例配料加工而成的一种新型果酱。以胡萝卜75％+山楂25％的配比为最佳,该果酱无论是颜色、口味,还是质地都达到和超过了山楂酱的质量要求,并富含多种维生素,维生素A原-胡萝卜素的含量达2.33mg/100g,Vc为28.02ng/100g,V_(B1)为0.16mg/100g,V_(B3)0.08mg/100g、烟酸为1.23ng/100g。所用原料成本低廉,成品的经济效益显著。     

Biological and genetic characterization of carrot red leaf virus and its associated virus/RNA isolated from carrots in Hokkaido,Japan

Carrot motley dwarf (CMD) is caused by mixed infection of carrot red leaf virus (CtRLV) with either carrot mottle virus (CMoV) or carrot mottle mimic virus, and additional infection with CtRLV-associated RNA (CtRLVaRNA). Here, the author investigated the viruses or virus-like RNA isolated from carrots with reddening symptoms in Hokkaido, the northern island of Japan. Three types of infections were mainly detected: single infection with CtRLV, which was most prevalent; double infection with CtRLV and CMoV; and triple infection with CtRLV, CMoV, and CtRLVaRNA. Fields with the three agents were severely affected, with diseased plants showing mottling, whereas in fields where disease incidence was low and sporadic, CtRLV was often found alone in plants with mild symptoms. Inoculation tests using carrot plants showed that CMoV enhanced disease severity, and the RNA accumulation of CtRLV. However, in the presence of CtRLVaRNA (+ CMoV), distinct symptoms such as systemic mottling and stunting developed, while the enhancement of CtRLV accumulation was abolished. These results imply that CtRLVaRNA (+ CMoV) antagonizes CtRLV despite its dependence on CtRLV for aphid transmission, and that mixed infection with CtRLVaRNA is involved in the development of the conspicuous mottling. All agents detected in Hokkaido were very similar to European and American isolates in terms of their genomic sequences and host range. This represents the first report of CMD in Japan, and provides further information on the genetic and biological properties of CMD-associated agents, as well as the aetiology of the disease.     

红外辐射干燥胡萝卜切片结构特性研究

在不同干燥条件下进行胡萝卜切片红外辐射干燥试验,对表观密度、孔隙率、体积比和体积收缩系数进行了研究。结果表明:表观密度与辐射距离、辐射功率成反比,孔隙率随着含水率的减小而增大,样本厚度与孔隙率成反比,辐射距离与孔隙率成正比,辐射功率在一定范围与孔隙率成正比,超过该范围成反比;为确定适合胡萝卜收缩率和干基含水率比的数学模型,分别基于二次多项式利用线性最小二乘法、指数方程利用非线性最小二乘法对试验数据进行了拟合,得出二次多项式模型拟合较优,能够更好地预测红外干燥过程中胡萝卜收缩率和干基含水率比之间的关系。