共查询到19条相似文献,搜索用时 218 毫秒
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美味油桃是山东省果树研究所于上世纪90年代从澳大利亚引进的美国油桃新品种.通过在山东省的临沂、聊城、济南、泰安和江苏省的新沂等地的栽培试验,均表现出果实大、果面鲜红、质地细嫩,酸甜可口,香气浓郁,品质优,早实丰产,适应性和抗逆性强等诸多优点. 相似文献
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‘中红杨’来源于杨树品种2025的芽变,经多年研究培育而成。雄株,较速生。从春季芽萌动到初夏整株叶片及新发嫩枝紫红色,初夏以后到10月中旬新发嫩叶及嫩枝为鲜艳的紫红色,而中下部成熟叶片则变为红绿色,10月中旬以后整株叶片逐渐变为桔黄色,直至落叶。适宜种植范围广。 相似文献
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We examined the somatic embryogenesis from and histological studies of zygotic embryos of seeds in European Grape 'Moldova' (Vitis vinifera U 'Moldova'). Primary calli were initiated on Nitsch and Nitsch (NN) medium supplemented with 1.0 mg·L^-1 2,4-D and 0.5 mg·L^-1 6-BA. Embryogenic calli were produced upon transfer to a NN medium with 0.5 mg·L^-1 6-BA and 2 mg·L^-1 NAA and somatic embryos were obtained on a half strength MS medium without plant growth regulators. During the somatic embryo germination, an addition of 1.0 mg·L^-1 6-BA in the medium could accelerate somatic embryos to develop into normal plants and increase the conversion rate from 0 to 43.3%. Histological studies of embryogenic calli and somatic embryos demonstrated dynamic changes of proteins and starch grains. The developmental processes of somatic embryos were similar to those of zygotic embryos, including typical epiderma, cotyledon primordium and vascular tissue. 相似文献
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2005年以来,尽管国际上以美国为首的经济发达国家对我国家具出口不断实施各种名目的贸易壁垒政策,以及部分家具发达国家对我国联手实施限卖,我国木制家具仍然突破以往进口走低、出口走高的状态,取得进、出口双双回升的局面。 相似文献
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Amit Kumar Tripathi Uma Shankar 《中国林学(英文版)》2014,(4):227-246
Background: The 'Khasi hill sal' forest ecosystem in Meghalaya, India represents the easternmost limit of sal distribution. We tested if tree diversity and compositional heterogeneity of this ecosystem was higher than other sal-dominated forests due to moister environment. Methods: Vegetation was sampled in 11 transects of 10 m width and up to 500 m length covering 5.2 ha area. All stems ≥10 cm girth at breast height were enumerated. Results: We found a pattern of mixed dominance of Shored robusta (sal) and Schima wollichii and co-dominance of Pinus kesiyo and Careya arborea. The Shannon's diversity index (H') was 3.395 nats. This value is remarkably high and competitive to that of moist sal forests of eastern Himalayan foothills and sal-dominated forests of Tripura. A high value of H' was manifested by: a) high species richness (S = 123), b) good equitability (70.6%), c) 'fair' resource apportionment, and d) abundance of rare species (84% species with less than one per cent of total individuals, 67% species with two or less individuals ha-1 and 59% species with one or less individuals ha-1). The compositional heterogeneity was 'fair' (Whittaker'sβw = 3.15). The presence of Fagaceae with six species commanding 4.3% of importance value (IVl) and of a pine (P. kesiya) in sal forest was remarkable. As many as 58 species showed 'low density (〈 10 individuals ha-1), uniform dispersion', five species achieved 'higher density (〉 10 individuals ha-l), uniform dispersion' and six of the top 10 species were 'clumped'. The forest showed an exponential demographic curve illustrating 'good' regeneration of an expanding community. Vertical stratification was simple with a poor canopy and fair subcanopy, which together with low basal area (15.65 m2 . ha-1 for individuals ≥ 10 cm gbh) indicated logging of mature sal trees in the past. Conclusions: The 'Khasi hill sal' forest ecosystem is richer in alpha and beta diversi 相似文献
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Xue-Jun OUYANG Wan-Hui YE Marc HOCKINGS Chung-Lim LUK Zhong-Liang HUANG 《中国林学(英文版)》2013,15(4):340-348
Up until 2009, 2541 nature reserves had been established in China. However, the process of developing this system of nature reserves was not quite smooth. Various kinds of information related to nature reserves, such as annual growth, the type of nature reserves established, motives behind building a nature reserve, legal instructions and the constitution of government sectors, were collected and analyzed in order to highlight the characteristics of the devel- apment of our nature reserve system. As a result, we identify three phases and their characteristics, i.e., the initial phase from 1956 to 1978, the establishment phase from 1979 to 1996 and the management standardization phase from 1997 to 2009, could be clearly identified. It is suggested that since the establishment of this comprehensive structural frame- work in China, the system should be entering a new developing phase. We recommend that more attentions should be paid on how to guarantee effective management and how nature reserves are able to maintain their value and fulfill their abjectives in the future. 相似文献
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Analysis of moisture diffusivity of larch timber during convective drying condition by using Crank's method and Dincer's method 总被引:4,自引:0,他引:4
Two analytical procedures (Crank's method and Dincer's method) for porous solid materials were reevaluated and used to determine moisture diffusion coefficients and moisture transfer coefficients for larch lumber subjected to drying. A diffusion-like equation was used to describe drying process data. The lumber was idealized in the modeling as infinite plates. The moisture transport process inside the board was assumed to be one-dimensional. The macroscopic drying kinetics curves of larch timber at particular conditions were determined experimentally. Based on these data, calculation for both the moisture diffusion coefficients and moisture transfer coefficients by the Dincer's analytical procedure were made. The dynamic moisture diffusion coefficients by the traditional Crank's method were calculated. In general, diffusion coefficients calculated by the Dincer's method were all higher than those by Crank's method. These results could be due to the differences between two analytical methods and also different characteristics between solid moisture diffusion process and heat transfer process. Therefore the analysis and solution procedures of moisture diffusion differential equations need to be adapted in the future. With drying temperature's increasing moisture diffusion coefficient (D) and moisture transfer coefficient (k) increases accordingly. Also the relationships between diffusion coefficients and temperature as well as material moisture contents were analyzed by using Arrhenius equation and bound water transport theory. 相似文献
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We examined the somatic embryogenesis from and histological studies of zygotic embryos of seeds in European Grape 'Moldova' (Vitis vinifera L. 'Moldova'). Primary calli were initiated on Nitsch and Nitsch (NN) medium supplemented with 1.0mg'L-1 2,4-D and 0.5 mg'L-1 6-BA. Embryogenic calli were produced upon transfer to a NN medium with 0.5 mg-L-1 6-BA and 2 mg.L-1 NAA and somatic embryos were obtained on a half strength MS medium without plant growth regulators. During the somatic embryo germination, an addition of 1.0 mg.L-1 6-BA in the medium could accelerate somatic embryos to develop into normal plants and increase the conversion rate from 0 to 43.3%. Histological studies of embryogenic calli and somatic embryos demonstrated dy-namic changes of proteins and starch grains. The developmental processes of somatic embryos were similar to those of zygotic em-bryos, including typical epiderma, cotyledon primordium and vascular tissue. 相似文献
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花曲柳体胚发生和植株再生 总被引:1,自引:0,他引:1
以花曲柳合子胚的单片子叶为外植体成功诱导出体胚并获得再生植株。未成熟合子胚的子叶在添加400mg·L-1水解酪蛋白、0.25mg·L-16-BA、1.5mg·L-1NAA、70g.L-1蔗糖和6g·L-1琼脂的MS1/2培养基上可以成功诱导产生体胚,诱导率达到34.7%,每个外植体上体胚数量为2~9个。成熟合子胚的子叶在添加0.25mg·L-16-BA、2mg·L-1NAA的MS1/2培养基(其他成分同上)上可以成功诱导产生体胚,诱导率为10.0%。体胚在MS1/2培养基上经过成熟培养后可以正常萌发,萌发率87.6%。萌发的体胚植株在MS1/2+0.01mg·L-1NAA培养基上生长较好,具备实生幼苗的外观特征。经炼苗后的体胚苗移植到栽培基质(草炭土:蛭石:珍珠岩体积比为5:4:1)中可以正常生长,成活率为75.0%。 相似文献
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Toru Taniguchi Kazuo Tabuchi Kazuho Yamaguchi Yoshitake Fujisawa 《Journal of Forest Research》1996,1(1):51-55
Somatic embryos ofAcanthopanax sciadophylloides Franch. et Sav. were differentiated from both zygotic and somatic embryos and calli, and plants were regenerated from these
somatic embryos. A zygotic embryo, enclosed within a small portion of the endosperm, was incubated on Murashige and Skoog
(MS) media supplemented with various combinations (range 0–10.0 mg/l) of 6-benzylaminopurine (BAP) and 2,4-dichlorophenoxyacetic acid (2,4-D). After 4 months, swelling of the zygotic embryos
and callus formation was observed. When the swollen embryos were transferred to MS medium supplemented with 0.5 mg/l of 2,4-D, somatic embryos were formed in one to two months. After subculture on the same medium, new embryos were differentiated
from various parts of the older somatic embryos. The calli were cultured on medium supplemented with 2.0 mg/l of 2,4-D and BAP for three weeks. Proliferated calli were transferred to medium supplemented with 1.0 mg/l of 2,4-D and BAP. Somatic embryos were differentiated from the calli within one to two months. Somatic embryos were germinated
on half-strength MS medium without plant growth regulators and the plantlets were grown in soil.
A part of this paper was presented at the 106th Annual Meeting of the Japanese Forestry Society (1995) & First Asia-Pacific
Symposium on Forest Tree Genetic Improvement (Beijing). 相似文献
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刺槐未成熟合子胚的体细胞胚胎发生和植株再生 总被引:3,自引:0,他引:3
以刺槐不同胚龄的未成熟合子胚为外植体,采用混合正交试验设计,研究幼胚胚龄和不同外源激素种类及质量浓度对刺槐胚性愈伤组织的诱导和体细胞胚分化、萌发的影响.结果表明:开花后8周(55天左右)是胚性愈伤组织和体胚诱导的最佳外植体取材时期;MS+2,4-D 5.0 mg·L-1 +BA0.5 mg·L-1是诱导胚性愈伤组织的最佳培养基,出愈率最高为95.42%±0.02%;MS +NAA0.5 mg·L-1 +BA0.5 mg·L-1+谷氨酰胺250 mg·L-1+水解酪蛋白500 mg·L-1是体细胞胚诱导和分化的最佳培养基,直接体细胞胚发生率最高为92.40%±0.12%,通过愈伤组织诱导体细胞胚发生的频率最高为90.73% ±0.49%.一旦形成球形胚,将培养物转接到不含任何生长调节剂的MS培养基上,体细胞胚经成熟萌发可进一步形成完整小植株. 相似文献
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以巴西香蕉品种的薄切片为外植体高频地诱导出愈伤组织,并诱导出了不定芽,获得了再生植株。在实验过程中,利用正交实验中筛选出愈伤组织诱导的最佳培养基为MS+2,4-D 4.0 mg.L-1+KT 1.0 mg.L-1+NAA 1.0 mg.L-1+活性炭200 mg.L-1,诱导率可达100%,愈伤组织增殖的最佳培养基是MS+2,4-D 2.0 mg.L-1+6-BA 0.5 mg.L-1+NAA 0.5 mg.L-1+活性炭100 mg.L-1,继代3-4次的愈伤组织在6-BA浓度为5.0 mg.L-1的分化培养基上能分化出不定芽,继代10次之后愈伤组织在继代培养基上开始出现褐化现象,愈伤组织增殖明显受到抑制,褐化的愈伤组织逐渐死亡。 相似文献
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离体培养条件下核桃器官发生和体细胞胚胎发生 总被引:11,自引:0,他引:11
采自幼树、成年树及成年树伐根萌条的嫩梢腋芽,在改良DKW培养基+6-BA1.0mg/L中可伸长生长;在加有6-BA1.0mg/L+IBA 0.01mg/L的继代培养基中,可保持腋芽的生长并形成不定芽。芽增殖率为每月600%左右。芽苗经5.0mg/L IBA处理7天,然后在含活性炭的无激素培养基中培养20天,有54%可生根成苗。5月中旬至6月上旬的幼胚,在改良DKW培养基+6-BA1.0 mg/L中,黑暗培养30天左右可产生体细胞胚,并可连续多代保持胚性分生能力。体胚在无激素的发芽培养基中黑暗培养7天左右可发芽成苗。胚性愈伤组织在悬浮振荡培养中可保持分生能力。 相似文献
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唐巍 《中国林学(英文版)》2001,3(2)
三个基固型的火炬松成熟合子胚被培养在附加 8mg·L-12 ,4 D ,4mg·L-1BA ,4mg·L-1KT ,5 0 0mg·L-1水解酪蛋白和 5 0 0mg·L-1谷氨酰胺的愈伤组织诱导培养基上诱导愈伤组织 .来自于子叶、胚轴和胚根的愈伤组织在附加 1 6mg·L-12 ,4 D ,0 8mg·L-1BA和 0 8mg·L-1KT的愈伤组织增殖培养基上培养 9周后 ,可获得 16 9%的胚性愈伤组织 .通过建立胚性细胞悬浮系和研究ABA、PEG和活性炭对体细胞胚成熟的促进作用 ,优化的体细胞胚胎发生体系被建立 .71棵再生小苗被用于移栽试验 ,2 3棵小苗在田间移栽成活 相似文献