共查询到17条相似文献,搜索用时 93 毫秒
1.
植物生长调节剂对格药柃硬枝扦插繁殖的影响 总被引:1,自引:1,他引:0
研究了NAA、IBA对格药柃硬枝扦插繁殖的影响.结果表明,选择适当浓度的外源植物生长调节物质可显著提高格药柃硬枝扦插繁殖效果.其中用1000mg/L质量浓度的吲哚丁酸溶液速浸5min插穗,其生根率可达76.67%. 相似文献
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植物激素对平菇茵丝生长及酶活性的影响 总被引:2,自引:0,他引:2
采用固体平板和液体摇瓶培养方法,研究了赤霉素、2,4-D、吲哚乙酸和萘乙酸4种激素对平菇- 126菌丝生长及酶活性的影响.结果表明,吲哚乙酸虽然能提高发酵液胞外蛋白的含量和过氧化物酶活性,但对菌丝的生长起抑制作用,这与吲哚乙酸能引起平菇菌丝裂解和细胞膜渗漏有关;萘乙酸、低浓度2,4-D能促进菌丝的伸长;萘乙酸、赤霉素在低浓度下也能促进菌丝的分枝,对菌丝的生长整体上起促进作用.除吲哚乙酸外,其他3种激素对平菇菌丝生长影响都有两重性:低浓度下能促进菌丝的生长,浓度过高则会对菌丝生长产生毒害作用. 相似文献
3.
采用固体平板和液体摇瓶培养方法,研究了赤霉素、2,4-D、吲哚乙酸和萘乙酸4种激素对平菇-126菌丝生长及酶活性的影响。结果表明,吲哚乙酸虽然能提高发酵液胞外蛋白的含量和过氧化物酶活性,但对菌丝的生长起抑制作用,这与吲哚乙酸能引起平菇菌丝裂解和细胞膜渗漏有关;萘乙酸、低浓度2,4-D能促进菌丝的伸长;萘乙酸、赤霉素在低浓度下也能促进菌丝的分枝,对菌丝的生长整体上起促进作用。除吲哚乙酸外,其他3种激素对平菇菌丝生长影响都有两重性:低浓度下能促进菌丝的生长,浓度过高则会对菌丝生长产生毒害作用。 相似文献
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壳聚糖对小麦发芽及生根效应的研究 总被引:1,自引:0,他引:1
利用壳聚糖浸泡小麦种子,通过考察小麦的出芽率、发芽指数、活力指数、生根数量和根的长度等各项指标的变化,探讨壳聚糖对小麦发芽和生根生理效应的影响.结果表明,当pH值6.5、壳聚糖浓度为4-6mg/mL时能显著提高小麦种子活力,促进幼苗生长;当壳聚糖浓度低于8mg/mL时,小麦的出芽率、发芽指数、活力指数随壳聚糖处理浓度的增大而明显提高;当壳聚糖浓度为4mg/mL、浸泡时间为10h时,小麦种子生根效应最为明显. 相似文献
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《资源开发与市场》2017,(5)
以野生峨眉金线莲的茎段腋芽为外植体,采用正交设计L16(4~5)对野生峨眉金线莲丛生芽诱导、生根的4个因素(基本培养基、6-BA、NAA、AC(活性炭))在4个水平上进行组织培养优化试验,以期建立完整、高效、廉价的培养体系。结果表明:基本培养基、不同激素浓度配比等因素对峨眉金线莲的分化、生根有着显著影响。外植体最佳消毒方案是75%酒精浸泡10s,0.1%的HgCl_2浸泡消毒10min;峨眉金线莲最佳丛生芽诱导培养基为:MS+10%香蕉+6-BA3mg/L+NAA 0.5mg/L+AC 3g/L;最佳生根壮苗培养基为:1/2MS+10%土豆+NAA 2mg/L+6-BA 0.5mg/L+AC 3g/L。该体系对峨眉金线莲种质资源保护与开发利用具有一定的参考意义。 相似文献
9.
速生杨树的主要特点如下:①速生。树胸径栽后3年总胸径为21.1cm,树体高达16m。②耐桑天牛。对桑天牛抗性强,少受桑天牛侵害。③易生根。生根能力强,生根率及根的生长速度是对照品种的160%。④抗病性强。抗粉锈病、黑斑病、溃疡病。 相似文献
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速生杨树及其栽培技术 总被引:2,自引:0,他引:2
速生杨树的主要特点如下:①速生。树胸径栽后3年总胸径为21.1cm,树体高达16m。②耐桑天牛。对桑天牛抗性强,少受桑天牛侵害。③易生根。生根能力强,生根率及根的生长速度是对照品种的160%。④抗病性强。抗粉锈病、黑斑病、溃疡病。 相似文献
11.
Willis SG Hole DG Collingham YC Hilton G Rahbek C Huntley B 《Environmental management》2009,43(5):836-845
Global climate change, along with continued habitat loss and fragmentation, is now recognized as being a major threat to future
biodiversity. There is a very real threat to species, arising from the need to shift their ranges in the future to track regions
of suitable climate. The Important Bird Area (IBA) network is a series of sites designed to conserve avian diversity in the
face of current threats from factors such as habitat loss and fragmentation. However, in common with other networks, the IBA
network is based on the assumption that the climate will remain unchanged in the future. In this article, we provide a method
to simulate the occurrence of species of conservation concern in protected areas, which could be used as a first-step approach
to assess the potential impacts of climate change upon such species in protected areas. We use species-climate response surface
models to relate the occurrence of 12 biome-restricted African species to climate data at a coarse (quarter degree-degree
latitude-longitude) resolution and then intersect the grid model output with IBA outlines to simulate the occurrence of the
species in South African IBAs. Our results demonstrate that this relatively simple technique provides good simulations of
current species' occurrence in protected areas. We then use basic habitat data for IBAs along with habitat preference data
for the species to reduce over-prediction and further improve predictive ability. This approach can be used with future climate
change scenarios to highlight vulnerable species in IBAs in the future and allow practical recommendations to be made to enhance
the IBA network and minimize the predicted impacts of climate change. 相似文献
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报道了中国环境管理干部学院(下称中环院)校园内15种河北省新记录植物:心叶喜林芋、裂叶喜林芋、水鬼蕉、紫背竹芋、佛手掌、白花含笑、胶州卫矛、白粉藤、灰莉、阿拉伯婆婆纳、母草、菜豆树、鸡矢藤、钻叶紫菀、香丝草。 相似文献
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David E. Hojman 《Resources Policy》1980,6(4):290-302
The bauxite-aluminium industry structure is reviewed to illustrate the character of the threat posed by the formation of the International Bauxite Association (IBA). Bauxite price is a transfer price internal to vertically integrated firms, but Caribbean governments' fiscal revenue needs provoked a consistent tendency towards price increases. Australia is not interested in this or in a bauxite cartel, but rather in developing smelting capacity, exploiting its energy resources, and the elimination of barriers to Australian aluminium imports. Some elasticity estimates previously presented for demand and supply, together with their estimation method and policy implications, are strongly criticized. 相似文献
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探讨了蜈蚣草组织培养的最佳孢子萌发培养基、初代培养基、最佳继代培养基、生根培养基。结果表明,蜈蚣草孢子在1/2MS孢子萌发培养基上萌发效果最好,经初代培养后最佳继代培养基为1/2 MS+6-BA 0.5mg/L+NAA 0.2mg/L,经生根培养后炼苗移栽成活,因此通过孢子组织培养成为蜈蚣草幼苗快速繁殖的最佳途径。 相似文献
15.
To examine whether tree rings can be used to detect or assess local historical 90Sr or 137Cs fallout, such as that resulting from the Hiroshima atomic bomb, radial distribution of 90Sr and 137Cs in trees was examined. We studied a gymnosperm [Japanese cedar, Cryptomeria japonica (L. f.) D. Don] and an angiosperm (Japanese persimmon, Diospyros kaki Thunb.) tree species from the vicinity of the atomic bomb hypocenter, and from other locations in Japan. A significant amount of 137Cs was detected in tree rings formed before 1945, indicating lateral migration of Cs. In contrast, the specific activity of 90Sr in the Hiroshima Japanese cedar showed the highest level in 1945, due to relatively immobile characteristics of Sr compared with Cs. Strontium-90 and Sr analyses in tree rings helped identify and distinguish between residual 90Sr activity from the Hiroshima atomic bomb and the atmospheric nuclear testing. This indicates the possibility of detecting or assessing previous local 90Sr pollution through with treering analysis. 相似文献
16.
Rufus K. Guthrie Donald S. Cherry 《Journal of the American Water Resources Association》1979,15(1):244-248
ABSTRACT: The uptake of ten chemical elements was measured in water, sediment, fly ash, and the major biotic components of an ash basin drainage system. The biota tested represent several trophic levels observed in the settling basin and receiving swamp of the system. Concentrations were measured by neutron activation (NAA) in the major biotic groups including aquatic bacteria, algae, macrophytes, midges, dragonflies, crayfish, tadpoles, and fish. Only three elements (Cu, Zn, Cd) were more highly concentrated in water from a nearby unpolluted stream than in the fly ash effluent. Sediment concentrations of all elements were highest in the ash drainage system with Al and Fe being consistently highest. Among the biota, Hydrodictyon sp. and Lemna perpusilla had the highest concentrations of Al and Fe while other macrophytes were the major accumulators of Mn and Ba. Invertebrates generally concentrated high amounts of Cu and Zn although Cd and Hg were accumulated most by crayfish. Selenium was selectively concentrated by bacteria, crayfish (Procambarus sp.) and mosquitofish (Gambusia afflnis). Consequences of elemental concentrations in sediment and in specific trophic level groups are discussed. 相似文献
17.
Nishimura S Maie N Baba M Sudo T Sugiura T Shima E 《Journal of environmental quality》2012,41(3):823-833
Chromophoric dissolved organic matter (CDOM) leached from leaf litter is a major source of humus in mineral soil of forest ecosystems. While their functions and refractoriness depend on the physicochemical structure, there is little information on the quality of CDOM, especially for that leached in the very early stages of litter decomposition when a large amount of dissolved organic matter (DOM) is leached. This study aimed to better understand the variations/changes in the composition of CDOM leached from senescent leaf litter from two tree species during the early stage of decomposition. Leaf litter from a conifer tree (Japanese cedar, D. Don) and a deciduous broad-leaved tree (Konara oak, Thunb.) were incubated in columns using simulated rainfall events periodically for a total of 300 d at 20°C. The quality of CDOM was investigated based on the fluorescence properties by using a combination of excitation-emission matrix fluorescence (EEM) and parallel factor analysis (PARAFAC). In addition, the phenolic composition of DOM was investigated at a molecular level by thermally assisted hydrolysis and methylation-gas chromatography-mass spectrometry (THM-GC-MS) in the presence of tetramethylammonium hydroxide (TMAH). The EEM was statistically decomposed into eight fluorescence components (two tannin/peptide-like peaks, one protein-like peak, and five humic-like peaks). A significant contribution of tannin/peptide-like peaks was observed at the beginning of incubation, but these peaks decreased quickly and humic-like peaks increased within 1 mo of incubation. The composition of humic-like peaks was different between tree species and changed over the incubation period. Since tannin-derived phenolic compounds were detected in the DOM collected after 254 d of incubation on THM-GC-MS, it was suggested that tannins partially changed its structure, forming various humic-like peaks during the early decomposition. 相似文献