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991.
Mitochondrial DNA products among RAPD profiles are frequent and strongly differentiated between races of Douglas-fir 总被引:5,自引:0,他引:5
Racial differentiation and genetic variability were studied between and within the coastal, north interior, and south interior races of Douglas-fir using RAPD and allozyme markers. Nearly half of all RAPD bands scored (13:45%) were found to be amplified from mitochondrial DNA. They exhibited maternal inheritance among hybrids and back-crosses between the races, and were much more highly differentiated (GST= 0.62 for haplotype frequencies) than were allozymes (GST= 0.26). No evidence of hybridization or introgression was detected where the coastal and interior races come into proximity in central Oregon. 相似文献
992.
993.
作者编写《广东植物志》旋花科时,对据本科的花粉形态特征划分族和属的意义予肯定并采用之;现将其中4个属、6个分类单位的分类或其分布等予于报道.对华南和北越的心萼薯属植物作修订;论证本地区不产AniseiaChoisy.被认为该属的狭花心萼薯A.stenantho和大花心萼薯A.stenanthavar.macrosrephana均是龙骨萼牵牛Ipomoeaatenantha;心萼薯Aniseiabiflora是毛牵牛Aniseiasinensis;云南土丁桂Evolvulusyunnanensis作新异名处理.应为我国新纪录的归化种(美洲土丁桂E.nummularius);裂叶鳞蕊藤Lepistemonlobatum为越南新纪录.也分布于我国江西、海南;海滩牵牛Ipomoeostolonifera这个开白花的海滩植物是一种中草药;虎脚牵牛Ipomoeapes-tigridis是亚洲和非洲东部热带的广布种,广东大陆西部也有;它是IpomoeaLinn.选模式种;这属的中名,本文恢复《广州植物志》(1956)等采用的牵牛属,会比较确切用“番薯属”为这个属的中名。 相似文献
994.
本文研究了中国产粗叶本属植物30种4亚种和7变种的地理分布,划分出三个分布区类型,十二个变型和四个亚变型。根据种多度和分布特征,中国粗叶本属植物在分布上表现出与中国的热带雨林、季雨林区,南亚热带常绿阔叶林带和中亚热带常绿阔叶林带相匹配的分布规律,并受几条植物地理界线的作用。通过对地理替代类群和一些特殊分布式样的分析,显示了所谓的“田中线”和一条北起四川峨眉向南经贵州西南部至广西西部的界线对粗叶木种的分布,特别是对中国-喜马拉雅和中国-日本替代分布具有明显的作用。这导致笔者认为“田中线”作为中国-日本分布的西界而另一第线作为中国-喜马拉雅分布的东界。进一步的分析还揭示由云南南部沿缅甸、泰国向南延伸的横断山余脉既充做一条植物南-北迁移的通道又是一条中南半岛西部(印-缅)与东部(印度支那-华南)的植物地理界线。 相似文献
995.
996.
黄土丘陵沟壑区水平梯田改土培肥增产技术措施体系 总被引:2,自引:0,他引:2
黄土丘陵沟壑区水平梯田改土培肥增产技术措施体系刘东海赵廷宁(宁夏西吉县农业局756200)(北京林业大学水土保持学院100083)赵国杰(宁夏西吉县农业技术推广站756200)TechniquesofSoilImprovementandYieldIn... 相似文献
997.
中药764—3对内毒素所致离体大鼠灌流肺损伤的保护作用探讨 总被引:8,自引:0,他引:8
本研究观察了大肠杆菌内毒素对大鼠离体灌流肺的氧化性损伤作用,并探讨了中药764-3对该损伤的保护作用。结果发现单纯离体灌流肺给予内毒素刺激未能引起肺动脉升高,这与在体情况下的反应不同。内毒素组的肺泡灌洗液中蛋白质含量和肺组织湿干重比值分别比其它组为高(P<0.05),该组肺组织匀浆和肺泡灌洗液中丙二醛(MDA)含量也显著高于其它组(P<0.01)。中药764-3能够显著地减轻肺水肿(P<0.05) 相似文献
998.
The role of maintenance respiration in plant growth 总被引:28,自引:8,他引:20
JEFFREY S. AMTHOR 《Plant, cell & environment》1984,7(8):561-569
Abstract Plant growth is the balance of photosynthetic gains and respiratory losses, and it is therefore essential to consider respiration in analyses of plant productivity. The partitioning of dark respiratory losses into two functional components, a growth component and a maintenance component, has proved useful. The growth loss is that associated with synthesis of new biomass while the maintenance loss is that associated with maintenance of existing biomass. Experimental evidence indicates that the respiratory cost of maintenance in herbaceous plants is about equal to the cost of growth over a growing season, with daily maintenace expenditures less important in the small, rapidly growing plant but increasing in significance as plant size increases and the relative growth rate decreases. Because it is such a large fraction of the total carbon budget of a plant, any variations in maintenance requirements may result in significant alterations in productivity. In the present work the theoretical and empirical bases of maintenance respiration are described: magnitudes of maintenance expenditures are summarized; and applications to models of plant growth and productivity are discussed. It is concluded that the costs of maintenance should be included in analyses of plant growth. 相似文献
999.
F. Leboulenger I. Perroteau P. Netchitailo I. Lihrmann P. Leroux C. Delarue D.H. Coy H. Vaudry 《Peptides》1984,5(2):299-303
Vasoactive intestinal peptide (VIP) is located in chromaffin cells of the frog adrenal gland and is able to stimulate corticosteroid secretion in amphibians. In the present study we have investigated the possible involvement of prostaglandins, microfilaments and calcium in the mechanism of action of VIP on frog adrenocortical tissue. Rana ridibunda interrenal dice were perifused with amphibian culture medium for more than 10 hours. Corticosterone and aldosterone concentrations were measured in the effluent perifusate using sensitive and specific radioimmunoassay methods. In the presence of indomethacin (5 μM), a specific blocker of prostaglandin biosynthesis, the spontaneous secretion of corticosteroids was markedly reduced (80%) but the stimulatory effect of VIP was not altered. The administration of the microfilament disrupting agent cytochalasin B (50 μM) inhibited both spontaneous and VIP-induced corticosteroid secretion. In the absence of calcium, the spontaneous level of corticosteroid was reduced to about 60% but VIP was still able to stimulate corticosteroid secretion. From these data we conclude that the integrity of the cytoskeleton is required for the secretory response of adrenocortical cells to VIP, whereas neither prostaglandins nor calcium are involved in VIP-induced adrenocortical stimulation. 相似文献
1000.
Ward R. Rice Jeffrey A. Whitsett 《Biochimica et Biophysica Acta (BBA)/Molecular Cell Research》1984,805(3):261-267
Release of [3H]phosphatidylcholine from pulmonary Type II epithelial cells was stimulated by terbutaline, forskolin and cytochalasin D. Compound inhibited both basal and agonist-stimulated release of [3H]PC. The IC50 for inhibition by compound was 1–2 μg/ml, and was similar for inhibition of both basal and stimulated release of [3H]phosphatidylcholine. Inhibitory effects of were noted following a 1 h exposure to compound and persisted up to 3 h. The inhibitory effect of compound was entirely reversed by removing compound from the external milieu. Compound had no effect on cytosolic cyclic AMP levels or lactate dehydrogenase release. Inhibition of surfactant release produced by compound was unaffected by changes in extracellular calcium concentrations. Compound is a non-toxic inhibitor of phosphatidylcholine release from Type II epithelial cells. 相似文献