黄瓜种质资源苗期耐低温性评价     

周双  秦智伟  周秀艳 《中国蔬菜》2015,1(10):22-26

以43份不同类型的黄瓜品种(品系)为试验材料,在黄瓜苗期进行低温处理(昼/夜温度为12℃/9℃),以冷害指数作为鉴定指标对其耐低温性进行评价。最终鉴定出7份耐低温材料、10份低温敏感型材料。对黄瓜低温处理后的冷害指数(Y)与叶绿素降低率(X1)、可溶性蛋白增高率(X2)、MDA增高率(X3)、脯氨酸增高率(X4)、POD增高率(X5)进行相关性分析,并建立了鉴定黄瓜耐低温性的回归方程:Y=0.433+0.671X1+0.005X2+0.121X3-0.733X4+0.248X5。  相似文献   

Allozyme Genetic Diversity and Conservation Strategy of Ten Natural Populations of Pinus bungeana Zuuc. ex Endl     

Li Bin* Gu Wanchun Chen Xiaoyang Research Institute of Forestry  Chinese Academy of Forestry  Beijing  P. R. China Beijing Forestry University  Beijing  P. R. China 《中国林学(英文版)》2003,5(4)

Pinus bungeana is a three-needle pine with typical fragmented distribution in central and northwestern China. Its natural resources are gradually decreasing and need to be conserved. For conserving genetic diversity of P. bungeana, the authors sampled 10 natural populations in its distribution areas and conducted the analysis of isozymes. Thirty one loci with 53 alleles on the basis of 16 enzyme systems were assayed. The parameters of genetic diversity at species and population level are respectively as follows: As= 1.742, Ae[s] = 1.49, Ps= 54.8%, He[s] = 0.162, Ap= 1.39, Ae[p]= 1.30, Pp= 34.85, He[p] = 0.0986. In comparison with other pines, P. bungeana possesses a slightly low amount of genetic variation especially at the population level. By contrast, the level of population genetic differentiation (GST = 0.135) is higher compared to other pines. All ten populations are divided into three groups according to Nei‘s genetic identity (I). There is a slight relation (r = 0.31) between genetic distance and geographical distance.Some populations are obviously deviate from Hardy-Weinberg equilibrium but the total population is basically accordant with Hardy-Weinberg equilibrium. The correlation analysis between allele frequencies and ecological factors showed that the alleles at loci of Idh and Pgi-2 had gradient variation trends of their frequencies. The sample capturing curves‘ analysis indicated that the captured alleles increased when the number of sampled populations increased and 99% out of whole allele pool of ten populations would be captured when five populations were randomly selected. At last,. the population genetic structure of P. bungeana and its conservation strategy were discussed.  相似文献   

A Commodity Chain Analysis on Commercial Timber Profits in Southern Collective Forest Region in China     

WANG Chunfeng* Afforestation Department  State Forestry Administration  No.  He Ping Li Dong Jie  Eastern District  Beijing  P. R.China 《中国林业科技(英文版)》2007,6(1):25-41

This article analyzes the factors shaping commercial timber profit distribution in China＇s Southern Collective Forest Region （hereinafter SCFR）. The article first describes the setting and distribution of a national harvest quota and analyzes its equity impacts on farmer households. Based on access mapping of the commercial timber commodity chain, profit distribution and mechanisms for controlling and maintaining access to profit are analyzed for different actors along the chain. The data show that farmers do not benefit to a great extent from the commerce, even if they are endowed with rights to manage and harvest forests and freely sell commercial timber in the region. There are a number of institutional and non-institutional factors that determine the extent of benefits farmers and other actors along the timber commodity chain can seek. Under current arrangements, the devolution of forest property in the SCFR does not ensure that farmer households benefit from commercial timber marketing. In order to stimulate farmers＇ enthusiasm for forest rehabilitation and management, beyond the devolution of forest property, it is firstly necessary to take effective measures to improve farmer access to commercial timber profits.  相似文献   

Study on Clonal Growth Pattern of Sabina vulgaris in Mu Us Sandland     

Zhang Guosheng  * Liu Haidong Liu Meizhen Wang Linhe Zhu Jinzhao Jirigele Inner Mongolia Agricultural University  Huhhot  P. R. China Beijing Forestry University  Beijing  P. R. China Institute of Botany  Chinese Academy of Science  Beijing  P. R. China Foresty Bureau of Wushen Banner  Dabuchake Ordos  P. R. China 《中国林学(英文版)》2003,5(2):10-16

1 Introducation Clonal plant is a type of plant accompanying by asexual reproduction in their vegetative growth process under natural conditions (Dong 1996a). Clonal growth enables clonal plants to increase the numbers of their morphological and physiological individuals (ramets). As a result, their genetical individuals (genets) are able to occupy a large area (Dong 1996a, Zhang et al. 2000, Chen et al. 1997, Dong et al. 1999, Dong 1996b). Many studies indicated that the indispensable re…  相似文献   

架子牛始重和购进价格对育肥效益的影响     

曹琼  张亚一  李雪娇  王消消  陈静  赵德兵  莫放* 《养殖与饲料．饲料世界》2013,(5):16-20

架子牛育肥是目前我国肉牛生产的主要形式,为了为架子牛育肥提供参考依据,本文分析了架子牛育肥的不同牛源购进价格和不同初始体重的育肥生产经济效益。结果表明,架子牛的初始体重明显影响育肥的效益,购进小体重架子牛进行育肥的每天的总收入低,但牛源成本也低;架子牛价格的上涨使肉牛育肥收入明显增加。  相似文献   

少刺型黄瓜新品种东农807     

周秀艳  秦智伟  张艳菊  王桂玲  武涛 《中国蔬菜》2010,1(23):29-29

东农807 是利用优势育种法选育的黄瓜一代杂
种。2004 年夏季以D0401 为母本与D0327- 4 等一系
列日本少刺类型自交系配制杂交组合，2005～2006
年进行品种比较试验，2007 年参加黑龙江省黄瓜区
域试验，2008 年继续参加区域试验的同时，参加黑龙
江省生产试验。2008 年获准黑龙江省农作物品种鉴
定委员会登记，定名为东农807。目前在华北和东北
地区累计推广面积达33.3 hm2。  相似文献   

浅谈仔猪黄痢的综合防控措施     

尚才  曲国辉  黄海栓  赵金山* 《山东畜牧兽医》2013,(3)

  相似文献   

41份非洲和湖北蚕豆种质资源SSR遗传多样性分析     

杨访问  吕春雨  廖芳丽  陈宏伟  李莉  万正煌  沙爱华  焦春海* 《分子植物育种》2020,(8):2619-2625

为研究蚕豆的遗传多样性,选用50对引物,对41份非洲和湖北蚕豆种质资源进行SSR遗传多样性分析。引物的PIC值介于0.28~0.91之间,平均值为0.68,50对引物共获得扩增DNA条带249条,多态性条带(等位基因)为246条。利用NTSYS软件对41份非洲和湖北蚕豆种质SSR数据进行聚类分析。在D-0.6957处将41份种质资源分为三大类群。第Ⅰ类(13个品种)为埃及和埃塞尔比亚的材料;第Ⅱ类(12个品种)主要为苏丹的材料;第Ⅲ类(16个品种)包括所有湖北地区的材料。通过Structure群体结构分析结果与聚类分析结果高度吻合。本研究结果可为蚕豆种质资源的收集和利用以及进一步开发利用SSR标记提供参考。  相似文献   

芽胞杆菌产生的脂肽类化合物在防治油菜菌核病中的作用     

伍辉军  王帅  湛江  马玲莉  高学文* 《东北农业大学学报》2012,(7):84-88

从解淀粉芽胞杆菌(Bacillus amyloliquefaciens)B3菌株和枯草芽胞杆菌(Bacillus subtilis)G4菌株中分别提取脂肽类化合物,配制成脂肽类生物农药乳油.平板拮抗活性检测试验表明,脂肽类生物农药乳油B3和G4能显著抑制油菜菌核病菌(Sclerotinia sclerotiorum)生长.油菜离体叶片接种试验中,脂肽类生物农药乳油B3和G4能显著抑制核盘菌在油菜叶片上的侵染和扩展.田间试验表明,脂肽类生物农药乳油B3和G4对油菜菌核病具有很好的防治效果,最高防效分别达55.8%和46.3%,并能够促进油菜生长  相似文献   

越橘果实总RNA提取方法比较研究   总被引：2，自引：0，他引：2  

裴嘉博  李晓艳  李亚东* 《东北农业大学学报》2012,(10):30-34

越橘成熟果实富含多糖、多酚和花色素苷等次生代谢物质,严重影响果实总RNA的提取.试验以越橘成熟果实的果肉和果皮为试材,采用适合多糖多酚植物RNA提取试剂盒及试剂和改良的CTAB法提取越橘果肉和果皮中总RNA,经琼脂糖凝胶电泳和核酸蛋白测定仪(NanoDrop 2000)检测.结果表明,改良的CTAB法效果最好,提取的总RNA完整性好,纯度高.通过RT-PCR验证,所提取的总RNA可以满足基因克隆等分子生物学试验的要求.  相似文献