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研究不同套袋时期对台农1号芒果果实外观、果皮色素、果皮色泽、果实内在品质的影响。结果表明,随着套袋时间的推迟,果实病虫果率提高,果实表面光洁度降低;不同套袋时期均显著降低果皮的叶绿素、类胡萝卜素含量,花青苷含量以早套袋处理低于晚套袋和未套袋处理;果皮亮度以不同套袋时期显著高于未套袋处理,色彩浓度以晚套袋和未套袋处理略高于早套袋处理,色度角处理间差异不显著;果实内在品质,不同套袋时期均不同程度的降低了果实的可溶性固形物、蔗糖、葡萄糖和果糖含量。综合来看,台农1号芒果以第2次生理落果后尽早套袋为佳。 相似文献
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[目的】探讨长江下游地区葡萄适宜的产量负载水平。【方法】以塑料大棚栽培的2～0年生主栽品种巨峰、夏黑、醉金香、美人指等为材料,设置11250—22500kg／hm2的产量负载水平,研究负载量对对果实品质的影响。[结果】随着产量负栽的增加,穗重、果粒重减小,果皮着色程度及果实可溶性固形物含量下降。从穗重、果粒重、果皮着色及果实可溶性固形物含量等综合来看,长江下游地区避雨栽培葡萄的产量宜控制在11250—15000kg／hm2。【结论]确定了长江下游地区避雨栽培葡萄的产量宜控制在11250～15000kg／hm2。 相似文献
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部分杧果品种果实若干品质特征的比较研究 总被引：1，自引：0，他引：1
研究57个杧果品种果实的7项品质特征,结果表明:不同杧果品种果实的可溶性糖、可溶性固形物、可滴定酸含量分别为9.00%～19.88%、11.30%～20.88%、0.02%～0.89%,糖酸比、固酸比分别为16.47～878.86、19.25～882.78,类胡萝卜素含量为6.38～48.60μg/g FW,贮藏期为6～17 d,相对应各项指标的平均值分别为13.51%、14.44%、0.26%、127.36、127.05、23.01μg/g FW、10.17 d,不同品种果实的品质存在显著差异.灰色关联度分析表明,57个杧果品种的综合品质以留香杧最佳.完熟时绿色果皮品种的果实可溶性糖含量显著高于红色果皮品种,且糖酸比值和同酸比值显著高于红色与黄色果皮品种.多胚品种的可溶性糖含量显著高于单胚品种.相关分析表明,芒果可溶性糖含量与可溶性固形物含量及类胡萝卜素含量呈极显著或显著正相关,可滴定酸含量与糖酸比、固酸比呈极显著负相关. 相似文献
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不同芒果种质果实品质性状多样性分析 总被引：4，自引：0，他引：4
对保存于中国热带农业科学院南亚热带作物研究所芒果种质圃的33份种质,采用方差分析、相关性分析和主成分分析方法,研究了芒果果实13个品质性状(可溶性固形物、可滴定酸、类胡萝卜素、果糖、葡萄糖、蔗糖、总糖、总酚、抗氧化能力、钾、钙、镁、铁)的多样性。结果表明,芒果果实品质性状变异非常丰富,变异系数在16.05%~70.24%之间,变异幅度以铁含量最小、蔗糖含量最大。一些果实品质性状之间存在显著或极显著的相关性,但多数品质性状具有相对独立性。主成分分析表明,13个品质性状可综合为6个主成分,累积贡献率达86.63%。其中,葡萄糖、果糖、总酚、DPPH、钙、铁、钾、镁8个性状是果实内在品质的主要性状。 相似文献
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针对豫北地区的大豆生产现状，从气候、土壤、品种、生态因素及市场需求等方面提出了优质大豆的发展策略与途径。 相似文献
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以长沙县高桥相同嫩度茶鲜叶原料采用卷曲形毛尖茶加工工艺制绿茶为对照,分别对沅陵县齐眉翠峰、凤娇碣滩茶、干发茶和军大坪茶4种绿茶的主要生化成分与感官品质进行初步分析。结果表明,沅陵4种绿茶的茶多酚总量28.76%~30.34%,游离氨基酸总量2.35%~3.22%,咖啡碱含量3.00%~3.63%,水浸出物含量37.26%~40.07%,可溶性糖总量5.46%~5.65%,可溶性蛋白含量1.50%~1.74%,类黄酮化合物总量1.16%~1.79%,叶绿素总量1.36%~2.01%,儿茶素总量13.53%~16.20%。与对照相比,4种绿茶的茶多酚、可溶性糖和儿茶素总量均高于对照,除齐眉翠峰外其余3种茶样水浸出物和叶绿素总量均高于对照,除干发茶外其余3种茶样类黄酮化合物总量均高于对照。 相似文献
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Sena L.P. VanderJagt D.J. Rivera C. Tsin A.T.C. Muhamadu I. Mahamadou O. Millson M. Pastuszyn A. Glew R.H. 《Plant foods for human nutrition (Dordrecht, Netherlands)》1998,52(1):17-30
In the western Sahel, indigenous plants become important staples when cereal harvests are inadequate to support populations inhabiting that region of Africa. The purpose of this study was to assess the nutrient content of several of these edible wild plants. The leaves of the following seven plant foods were analyzed: Ziziphus mauritiana, Cerathotheca sesamoides, Moringa oleifera, Leptadenia hastata, Hibiscus sabdarifa, Amaranthus viridi, and Adansonia digitata. The fatty acid, vitamin E, carotenoid, selected mineral and amino acid contents of these plant foods were determined. These same analyses were performed on the fruit of the Adansonia digitata. In quantitative and qualitative terms, Amaranthus viridis was found to be an excellent source of protein. Its amino acid composition compared favorably to that of a World Health Organization (WHO) protein standard. It also contained considerable amounts of the two fatty acids that are essential in humans (linoleic and -linolenic) and a number of minerals including iron, magnesium, calcium and zinc. The leaves of Hibiscus sabdarifa contained an appreciable quantity of protein the composition of which was comparable to the WHO standard. The mineral content of the leaves of this plant was also exceptionally high; noteworthy was its high zinc content. H. sabdarifa also contained significant quantities of the two essential fatty acids. Ziziphus mauritiana was an excellent source of the essential fatty acid linoleic acid and several of the metals including iron, calcium, magnesium and zinc. Its content of other essential nutrients, however, was rather low. In general, Adansonia digitata leaves were nutritionally superior to the fruit of the tree; however, the fruit did contain useful quantities of potassium, phosphorus, zinc and -linolenic acid. The Leptadenia hastata leaves were an especially good source of lutein and -carotene. These data should be useful to the people who inhabit the western Sahel in helping them devise healthy diets during times when cereal staples are in short supply. 相似文献
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通过电解质外渗法和匍匐茎恢复试验对‘阳江’狗牙根及其12个通过形态鉴定选出的坪用价值高且花序密度低的诱变后代进行抗寒性鉴定。电解质外渗法结果表明:诱变后代间的抗寒性具有较大差异,其叶片半致死温度(LT50)的变异范围为-7.6～-0.2℃(最低值与最大值相差7.4℃);参试材料抗寒性由强到弱依次为M18>M4>M26>M28> M22>阳江>M29>M31>M10>M37>M16>M1>M25,其中,有5个诱变后代抗寒性优于亲本,分别是M18、M4、M26、M28、M22。匍匐茎恢复实验结果表明:诱变后代M1、M22、M26、M31、M25在0℃和-5℃低温胁迫后的恢复生长率都高于亲本,恢复能力均优于亲本;M10、M37、M28在-5℃低温胁迫下,恢复生长能力低于亲本,抗寒性相对较弱,M16和M4在0℃和-5℃低温胁迫下,恢复生长率都低于亲本,抗寒性明显弱于亲本。综合2种方法鉴定结果显示:诱变后代M1、M25的恢复能力较强;M4、M28的叶片抗寒性较好,青绿期较长;M22、M18、M26的叶片抗寒性和匍匐茎恢复能力均较强;M29,M31的叶片抗寒性和匍匐茎恢复能力与亲本相似;M10、M16、M37的叶片抗寒性和匍匐茎恢复能力均较弱,整体抗寒性较弱。 相似文献
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1 吉林省平安农业科学院大豆研究工作简介吉林省平安农业科学院大豆研究所 ,设在吉林省长春市西安大路种子大厦内。现有科技人员 6人 ,其中研究员 2人 ,农艺师 2人 ,技术员 2人 ,定向培养研究生 2人。大豆研究所的主要任务是选育稳产、高产、优质及抗病虫大豆新品种 ;同时密切 相似文献
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Irrigation of Netted Gem potatoes was scheduled during three growing seasons by three methods: (a) when plants displayed first visual symptoms of moisture stress, (b) when indicated by a soil moisture budget involving estimated evapotranspiration, and (c) on the basis of tensiometer readings of soil moisture suction. When the tensiometer method of scheduling was used, the mean yields of tubers were 55.0 and 25.8 cwt/acre (6160 and 2890 kg/ha) higher than those obtained with the other two scheduling methods. Methods did not affect the specific gravity of potatoes. Method (a) scheduled irrigations least frequently. Scheduling by the budget method was not always adequate because it was based on the assumption that the crop extracted water from a constant 4 ft (1.2 m) profile from planting to full vegetative growth. In one year the budget method scheduled the first irrigation earlier than necessary and delayed the second irrigation during a critical period of crop growth. From full vegetative cover to harvest the irrigation schedules were alike for both the budget and tensiometer methods. 相似文献
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M. D. Harrison Gestur Johnson R. D. Barmington 《American Journal of Potato Research》1970,47(10):386-393
A broadcast application of PCNB (Terraclor) resulted in a reasonably uniform distribution of the chemical in the soil with the concentration decreasing in a linear fashion with increasing depth in the soil profile. A banded application resuluted in a considerably higher chemical concentration at the 4–6 inch depth than at the 0–2 or the 2–4 inch depths. The problem of the lack of uniformity of chemical distribution could probably be solved by altering nozzle placement and size and allow use of the band method of application to minimize grower cost. More complete disking in the case of the broadcast treatment would probably result in a relatively uniform distribution of the chemical but at higher cost to the grower. PCNB application rates of 10, 15 and 25 lbs per acre broadcast and 71/2, 10 and 121/2 lbs per acre in a band significantly reduced the severity ofRhizoctonia infection of Russet Burbank potatoes but did not increase potato yields significantly. 相似文献
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P. Mésochina W. Martin-Rosset † J.-L. Peyraud ‡ P. Duncan § D. Micol† S. Boulot¶ 《Grass and Forage Science》1998,53(2):189-196
Data from in vivo digestibility trial with four to six horses fed twenty-seven forage-based diets are used to calculate prediction equations for the digestibility of dry and organic matter, based on the crude ash (CA), crude protein (CP) and crude fibre (CF) contents of diets and faeces. The most precise prediction of dry-matter digestibility (r.s.d. = 0.032, R2= 0.80) was derived from a multiple regression including faecal (CP, CF) and dietary parameters (CF). Among faecal parameters, CP was the best single predictor of both digestibility (r.s.d) = 0.040, r2= 0.63) and dietary CP content (r.s.d = 0.028, r2= 0.59). For biological reasons we propose a non-linear model that allows prediction of dry- and organic-matter digestibility from faecal CP Content with reasonable Precision (r.s.d = 0.038, 0.036, r2= 0.65, 0.74, respectively). This will be adequate for many studies, especially for free-living animals in rangelands. 相似文献
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橡胶树丛枝病病原的抗血清制备与应用 总被引：5，自引：1，他引：4
以感染橡胶树丛枝病病原的长春花为材料,制备得到橡胶丛枝病病原菌抽提液,以抽提液为抗原免疫家兔,制备抗血清,经微量沉淀测定,抗血清效价为１：２０４８。应用橡胶丛枝病抗血清检测橡胶褐皮病,无症苗木检出率达３０％－３７％,可疑的褐皮病树检出率达８５．７％。 相似文献