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中国野生狗牙根(Cynodon dactylon)种质资源非常丰富，但育成品种较少。为选育更多优良狗牙根新品种以供草坪建植应用，中国热带农业科学院热带作物品种资源研究所自2000年起开展了狗牙根新品种的选育研究，从国内外收集的狗牙根种质资源中筛选出坪用性状优良的种质，经过连续多次单株选择和扩繁、坪用价值系统评价、品种比较试验、区域试验及生产性试验，选育出坪用性状优良的狗牙根新品种‘桂南’狗牙根，于2020年审定通过。‘桂南’狗牙根具有质地细腻、草坪密度大、均一性好、绿色期长、成坪速度快等特点。适于在我国长江中下游及以南地区作为景观绿化和水土保持草坪建植。本研究对‘桂南’狗牙根的选育过程、品种特征特性、栽培技术要点等进行总结，为‘桂南’狗牙根新品种的推广利用提供科学依据。 相似文献
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采用模拟践踏处理的方法对8个狗牙根(Cynodon)品种和4个结缕草(Zoysia)品种的耐践踏性进行初步评价。结果表明,践踏处理对各参试品种的坪用价值指标造成了显著影响(P0.05),践踏处理之后各材料叶片变窄变薄,密度、盖度、均一性下降,叶色变浅,反弹率升高,践踏处理1~2个月对参试材料直立生长影响较小,而处理3个月后草层高度显著下降。不同材料的耐践踏性存在较大差异,在短期践踏条件下,8个狗牙根品种中阳江狗牙根和C29100M1的坪用价值显著优于其他材料,而在长期践踏处理下,苏植2号杂交狗牙根坪用价值最高。4个结缕草品种中,苏植1号杂交结缕草作为运动草坪的综合坪用质量最高。该研究为这些新品种进一步的开发利用提供参考依据。 相似文献
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通过对盆栽狗牙根(新农一号狗牙根)、喀什狗牙根、C-3(狗牙根品系)、矮生天堂草以0、0.4%、0.8%、1.2%、1.6%五个土壤盐浓度进行处理,对其K+、Na+离子变化情况做了研究.结果表明相同盐浓度水平下,狗牙根体内K+、Na+离子含量茎叶大于根系,茎叶是K+、Na+离子累积的主要部位;K+/Na+比茎叶大于根系,说明茎叶耐钠性大于根系;随着盐度水平的递增,新农一号狗牙根、喀什狗牙根、C-3狗牙根K+、Na+离子吸收选择性系数增大,新农一号狗牙根＞喀什狗牙根＞C-3＞矮生天堂草.由此初步认为,狗牙根抗盐性从大到小依次为新农一号狗牙根＞喀什狗牙根＞C-3狗牙根＞矮生天堂草. 相似文献
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辐射育种是一种获得优良品种的快速有效的植物育种方法。本试验采用9000和11300 rads的60Co-γ射线,对8份杂交狗牙根(Cynodon dactylon×C.transvaalensis)的匍匐茎和根状茎进行辐射诱变,从坪用价值、抗寒性和生长速度3个方面对亲本及21个后代进行综合分析与评价,以选育出坪用价值高、生长速度快且抗寒性强的优良狗牙根新种质。结果显示:诱变使狗牙根的坪用性状发生了丰富的不定向的变异,同一亲本通过诱变既可以产生良性变异,也可以产生劣性变异;综合评价结果选育出坪用价值优良的诱变后代3份,分别为C75104M2-1/1,C75502M1和C75103M1-1,其抗寒性半致死温度分别为-0.51,-3.54和-3.67℃,其中C75502M1为坪用价值高且生长速度快的优良诱变后代。 相似文献
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冷害胁迫下3个狗牙根品种抗寒性比较研究 总被引：26，自引：3，他引：23
对冷害胁迫下3个狗牙根Cynodon dactylon品种的抗寒能力和超氧化物歧化酶(SOD)、过氧化物酶(POD)及POD同工酶的变化进行研究,结果表明:根据低温下细胞膜的伤害程度,3个狗牙根品种抗寒能力的强弱顺序为新农一号狗牙根C.dactylon cv.Xinnong No.1>喀什狗牙根C.dactylon cv.Kashi>矮生天堂草C.dactylon×C.trasvaalensis,且在根茎上反映更加明显;POD,SOD的活性均表现出先上升后下降的趋势,植株抗寒能力的强弱可能与它们的活性及其持续时间的长短有一定的正相关性;聚丙烯酰胺凝胶电泳表明,抗寒性越强的狗牙根品种POD同工酶条数也越多,且在冷害适应中未有新的同工酶谱带出现. 相似文献
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对冻害胁迫下新农一号狗牙根、喀什狗牙根、矮生天堂草的抗寒能力研究结果表明经除雪,在乌鲁木齐-25.6℃下新农一号狗牙根、喀什狗牙根能安全越冬,矮生天堂草则不能越冬;细胞电解质渗透率能够很好的反映出品种间抗寒能力的差异,可作为衡量狗牙根耐寒能力的有效生理指标;SOD、POD酶活性及其持续时间的长短可能与狗牙根的抗寒能力有一定的正相关性;聚丙烯酰胺凝胶电泳发现,新农一号狗牙根的POD同工酶谱带数多于其他两个品种,且冻害适应中未有新的同工酶谱带出现;与茎、叶相比,根茎更能反映出品种间抗寒能力的差异程度且更耐寒. 相似文献
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暖季型草坪草优良选系和品种抗盐性的初步评价 总被引：7，自引：3，他引：4
以叶片枯黄率为指标,通过水培法对5属12种50份暖季型草坪草优良选系和品种进行了抗盐性评价,为选育抗盐优质草坪草新品种提供试验依据。结果表明,供试草种间的抗盐性变异很大,总的变异系数达到60%,其中,结缕草属和狗牙根属变异系数分别为52%和29%,而结缕草和中华结缕草是变异最大的种,变异系数分别为56%和52%。总的来讲,抗盐性最强的多为细叶结缕草和沟叶结缕草植物,海雀稗‘Adalayd’、钝叶草‘S004’及部分结缕草、中华结缕草植物的抗盐性也较强,部分结缕草属其他材料和狗牙根属植物的抗盐性中等或较弱,而假俭草的抗盐性最弱。结缕草属中抗盐性比‘马尼拉’强的有7份材料,比‘兰引3号’强的有12份材料,而狗牙根属中除‘C158’、‘南京’狗牙根和‘C610’外,多数材料的抗盐性比对照品种‘Tifgreen’和‘Tifdwarf’强。抗盐性最强的3份选系(品种)为细叶结缕草‘Z160’、沟叶结缕草‘Diamond’和‘Z075’。 相似文献
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野生狗牙根与假俭草电导率测定 总被引：8，自引：0，他引：8
采集四川岷江流域、青衣江流域以及成都、雅安、天全、茂县等11个市县不同居群的野生狗牙根和野生假俭草材料,在四川农业大学草学系新试验基地内进行田间栽培试验并结合实验室测定,对其电导率进行了测定,并以此为依据鉴定其抗寒性的强弱。试验结果表明,野生狗牙根中电解质渗透率最大的是11号宜宾狗牙根(47.1%),最小的是12号宜宾狗牙根(34.6%);野生假俭草材料中电解质渗透率最大的是4号乐山假俭草(42.9%),最小的是1号雅安假俭草(27.2%);在所试材料中抗寒性最强的狗牙根是12号宜宾狗牙根,假俭草则是1号雅安假俭草。 相似文献
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S D Johnston C A Osborne J B Stevens 《Journal of the American Veterinary Medical Association》1975,166(12):1155-1160
The clinical, laboratory, and radiographic characteristics of polypoid cystitis in 2 dogs were similar to those commonly associated with neoplasms of the urinary bladder. Gross appearance of the polyps did not permit differentiation between inflammation and neoplasia; microscopic examination of excised tissue was required to establish a definitive diagnosis. Following surgical extirpation of the polyps, remission of clinical signs was induced by prolonged antibacterial therapy. 相似文献
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鄂尔多斯草木樨状黄芪研究利用综述 《畜牧与饲料科学》2016,37(11):22-22
鄂尔多斯草木樨状黄芪（Astragalus melilotoides cv.ordos）源于内蒙古鄂尔多斯市伊金霍洛旗境内采集的野生草木樨状黄芪种子,经过多年栽培选育而成,2010年经全国草品种审定委员会审定通过,登记为野生栽培品种。对鄂尔多斯草木樨状黄芪的植物学特征、生物学特征、饲用价值、栽培技术、生态建设中存在的问题等方面进行了综述,旨在为今后对该品种的研究推广奠定科研基础。 相似文献
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Cell surface membrane characteristics of B and T lymphocytes were demonstrated on cells from canine malignant lymphoma, and the results were compared with cytologic classification. Lymphoma in 4 of 5 dogs was found to have one or more characteristics of B lymphocytes. Correlation between the cytologic classification and the presence of B- and T-lymphocyte characteristics was not apparent. 相似文献
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The immunologic status of rhesus macaques (Macaca mulatta) with naturally occurring disease was evaluated by determining the percentages of B and T lymphocytes and mitogen responsiveness of lymphocytes in peripheral blood and lymph nodes. The B lymphocytes were identified by the presence of cell surface immunoglobulin and receptors for complement. The T lymphocytes were identified by their ability to form spontaneous rosettes with sheep red blood cells. Rhesus macaques with idiopathic or primary amyloidosis had normal lymphocyte characteristics. Peripheral blood lymphocytes from rhesus macaques with atypical tuberculosis had decreased percentages of spontaneous rosette-forming cells and depressed responses to concanavalin A, and those with chronic diarrhea or chronic arthritis were also found to have abnormal peripheral blood lymphocyte characteristics. The percentage of B and T lymphocytes in normal lymph nodes was variable, making simultaneous histologic examination necessary for evaluation of diseased animals. 相似文献
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Isolates of Edwardsiella tarda from four sources produced nonfilterable hemolsin in trypticase soy broth. The cell-associated hemolysin was partially heat labile, destroyed by formalin and sensitive to treatment with trypsin. These characteristics, and the observation that Ca++ or Mg++ ions enhanced activity, suggest that a proteinaceous, enzymic component may be responsible for the hemolytic activity. 相似文献
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本研究对普通枇杷(Eriobotrya japonica Linl.)、大渡河枇杷(Eriobotrya prinoides Rehd.& Wils. var. dadunensis H. Z. Zhang)和栎叶枇杷(Eriobotrya prinoides Rehd.& Wils.)的叶、果等性状进行了调查考证，结果表明，大渡河枇杷的各种性状都处于二者之间；不同大渡河枇杷单株的许多性状也有不同程度的分离，有些偏向于栎叶枇杷，有些偏向于普通枇杷，支持大渡河枇杷为栎叶枇杷和普通枇杷种间杂种的结论。 相似文献
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Sara Marques Eliane Silva Júlio Carvalheira Gertrude Thompson 《Research in veterinary science》2010,89(1):5-9
Bovine mastitis associated with Prototheca is considered a rare pathology, but is increasing in prevalence all over the world and therefore becoming more relevant to the dairy industry. The biochemical characterization of 47 Prototheca isolates retrieved from mastitic milk was performed in this study using API 20C Aux and two BBL Crystal Kits, followed by an analysis with InforBio software. The usage of this methodology, allowed the identification of discriminative phenotypic characteristics for the strains tested. The differential-character-finding algorithm used by this software permitted the identification of new phenotypic characteristics to discriminate between Prototheca zopfii, P. blaschkeae and P. wickerhamii, such as, citrate, phosphorycholine and arabinoside. The main objective of this study was to determine new phenotypic characteristics that allowed a better characterization of Prototheca spp. Usage of recent bioinformatic tools improved the analyses of several features that are important for a better characterization of Prototheca spp. 相似文献