共查询到20条相似文献,搜索用时 250 毫秒
1.
灰色系统理论对马铃薯早熟品种综合评估 总被引:1,自引:0,他引:1
采用灰色系统理论中的灰色关联度分析法对早熟马铃薯参试品种进行了多个性状综合评估,为早熟马铃薯品种选择利用提供了科学依据,同时对该方法在马铃薯早熟品种综合评估中的应用作了初步探讨性研究. 相似文献
2.
灰色系统理论马铃薯早熟品种综合评估 总被引:1,自引:0,他引:1
采用灰色系统理论中的灰色关联度分析法对早熟马铃薯参试品种进行了多个性状综合评估,为早熟马铃薯品种选择利用提供了科学依据,同时对该方法在马铃薯早熟品种综合评估中的应用作了初步探讨性研究。 相似文献
3.
番茄新品种选育中的灰色关联度综合评估 总被引:6,自引:0,他引:6
本文利用灰色系统中关联度分析理论在番茄新品种选育中综合评估的应用,通过分析表明,依据各品种的灰色关联度排序所进行的综合评估结果与各品种在田间的表现是一致的,说明此种方法可以应用于番茄新品种的综合评估。 相似文献
4.
全国菜豆新品种区试的灰色关联度评估 总被引:2,自引:0,他引:2
本文利用全国菜豆新品种区资料探讨了灰色关联度对新品种综合评估的应用,该方法完全适用于菜豆新品种的综合评估,并评估结果与品种实际表现一致。从而为菜豆新品种综合分析提供了有利的理论依据。 相似文献
5.
6.
7.
运用灰色系统理论中的关联分析方法,对9个加工番茄品系的9个性状进行综合评估分析。评估分析结果表明,20040805×20040806、20040805×20040803关联度大,与参考品种最接近,综合性状表现优。 相似文献
8.
灰色系统理论在蔬菜新品种综合评估与审定中的应用 总被引:8,自引:0,他引:8
简明地介绍了灰色系统理论中关联度分析法的基本原理与方法,并以辣椒一代杂种区域试验资料为例探讨了灰色关联度分析在蔬菜新品种综合评估和审定中的应用。实例分析表明,加权关联度完全可以作为蔬菜新品种综合评估的指标和新品种审定的主要依据。 相似文献
9.
2013-2014年在设施大棚条件下,以玉云苦瓜为对照,对新翠、翠玉、雅秀、春晓1号、翡玉5个苦瓜品种进行对比试验。试验结果表明,新翠苦瓜早熟、商品性优、生长势强,产量达5 394.3 kg/667 m2,综合性状优于其他5个品种,是平和地区早春设施大棚大面积种植的首选品种。 相似文献
10.
11.
12.
《International Journal of Fruit Science》2013,13(2):101-118
ABSTRACT Four pear cultivars originating from Portugal (‘Amêndoa’, ‘Amorim’, ‘Carapinheira Branca’ and ‘S. Bartolomeu’) were dried in a solar drier, following a traditional sun drying method normally used in Portugal for the production of dried pears. The temperature and relative humidity inside the drier were recorded hourly throughout the whole process, while the moisture loss in the pears was evaluated with a variable frequency along the drying process, according to the drying rate. From the results obtained, it was possible to conclude that the conditions inside the drier are very favorable to drying, with periods in which the atmosphere is characterized by very high temperatures and very low relative humidities. Furthermore, the drying rates of the four cultivars of pears used in this study were investigated and it was observed that all of them present a similar kinetic behavior, thus enabling the use of alternative cultivars for the production of dried pears. 相似文献
13.
14.
15.
16.
An assessment of genetic variability and relationships within Asian pears based on AFLP (amplified fragment length polymorphism) markers 总被引:1,自引:0,他引:1
A total of 100 Pyrus L. accessions native mainly to East Asia were subjected to amplified fragment length polymorphism (AFLP) analysis to evaluate genetic variability and relationships among the accessions. Six AFLP primer combinations produced a total of 459 fragments, of which 410 were polymorphic with a polymorphism percentage of 89%. The Dice's similarity coefficient among pear accessions ranged from 0.671 (P. betulaefolia Bge and P. elaeagrifolia Pall.) to 0.947 (‘Umajirou’ and ‘Immuraaki’). Occidental pears generally had low similarities to Asian pears. The dendrogram generated from all the accessions by unweighted pair-group method of arithmetic analysis (UPGMA) cluster analysis clearly distinguished Occidental pears from accessions of East Asia. P. ussuriensis Maxim., P. betulaefolia and P. communis L. clustered separately into independent groups in accordance with their morphological classification. Japanese pear cultivars formed two groups with some Chinese white pears and Chinese sand pears. Chinese white pears and Chinese sand pears independently formed their own groups and also mingled into mixed groups in the dendrogram. Therefore, Chinese white pears were treated as a cultivated group or an ecotype of P. pyrifolia: P. pyrifolia White Pear Group. The information obtained from this study will be of great help for understanding the origin and evolution of Asian pear cultivars. 相似文献
17.
M. Allen 《The Journal of Horticultural Science and Biotechnology》2013,88(2):127-135
Mechanical thinning of cv Delicious apples six to ten weeks after full bloom eliminated the need for hand thinning. Fruit removed earlier than six weeks would have shed naturally. Fruit removed after ten weeks was poorly distributed as increasing fruit weight caused the fruiting laterals to hang lower than 45° from the vertical. Mechanical thinning was non-selective for fruit size. Of five pear cultivars examined, Williams, Josephine and, to a lesser extent. Beurré Bosc could be mechanically thinned successfully. The long flexible peduncle was a major limitation in mechanically thinning Packham’s Triumph pears. Mechanical and hand thinning were equally effective in reducing the proportion of small fruit in Williams pears. 相似文献
18.
梨属植物分类的历史回顾及新进展 总被引:19,自引:3,他引:19
一般相信梨属植物的原种起源于第三纪的我国西部和西南部的山区。根据其原生分布,分为东方梨和西方梨。由于梨属植物分布范围广,加上梨属种间很容易发生自然杂交,梨属植物的分类至今仍存在很多问题。被大多数植物分类学家所认可的种大约在30个左右。我国是东方梨种的主要起源地,我国分类学家相信有13个种起源于我国。不仅如此,我国也是世界上梨品种类型最多的国家。主栽系统有砂梨、白梨、秋子梨和新疆梨等。最新的分子生物学证据表明,白梨、砂梨和日本梨系统可能起源于共同的祖先:分布于我国长江流域的野生砂梨。考虑到白梨在我国梨栽培中的重要地位,建议用Pyruspyrifoliavar.sinensis(Lindley)TengetTanabe来表示白梨系统。 相似文献
19.
中国红皮砂梨品种的SSR标记分析 总被引:6,自引:1,他引:5
采用SSR (Simp le sequence repeat) 标记技术对29个砂梨品种或类型(主要为红皮型) 做了鉴定, 并对其亲缘关系进行了分析。6对SSR引物(BGA35、KU10、BGT23b、NH004a、NH011b和NH015a)均扩增出了较多的等位基因。NH004a位点的等位基因数、有效等位基因、杂合度和香农多样性指数都较高,显示了良好的品种鉴定能力。除3对品种或类型可能为同物异名或芽变类型无法区分开外, 6对引物组合可以成功地鉴定其它品种。聚类分析可以将29个砂梨品种(类型) 明显分成4个组。第Ⅰ组全部来自云南, 其中包括2个绿皮砂梨品种, 其余为红皮砂梨, 说明该组内红皮砂梨的祖先可能与这些绿皮砂梨亲缘关系很近。在第Ⅱ、Ⅲ组中, 来自四川会理的红梨品种和云南的红梨品种交叉组合, 可能是两地间品种交流的历史反映。第Ⅳ组中来自四川会理的‘香酥梨’、‘栽秧梨’, 原产云南弥渡的‘弥渡香酥梨’以及原产云南丽江的‘长水火把梨’相互间及与其它梨的亲缘关系均较远。分布在云南各地的火把梨可能有不同的起源。 相似文献
20.
甘肃中部梨种质资源的AFLP分析 总被引:2,自引:0,他引:2
采用AFLP分子标记技术对甘肃中部梨种质资源的遗传多样性进行分析。结果表明,6对AFLP引物在40份甘肃梨种质中共扩增出472条带,其中多态性带为404条,多态率高达86%,显示了甘肃中部梨资源丰富的遗传多样性。任何一对引物可以鉴别所有40份资源,显示了很高的鉴别能力。采用UPGMA聚类分析法构建的系统树在相似系数为0.72时将40份种质分为7个组:西洋梨、新疆梨、白梨(砂梨)、木梨、褐梨组和2个秋子梨组。所有白梨品种与唯一的砂梨品种黄花梨聚为一个大组。形态学上归属不明的品种分别聚类到西洋梨、白梨、木梨和秋子梨组中。研究表明基于AFLP标记的梨资源分类体系可以反映甘肃地方梨品种和类型间的遗传多样性和亲缘关系。 相似文献