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《Scandinavian Journal of Forest Research》2012,27(1-4):77-83
Young trees (4–5 year old) of Betula pubescens Ehrh. growing in a stand in the middle of Sweden (lat. 60°15'N) were cut in early June to stump heights of 0 and 10 cm. The birch stumps were exposed to different relative light intensities (100, 50, 25 and 10%) for 100 days until mid September. Five stumps per treatment were used in a randomized complete block with seven blocks on mesic dwarf‐shrub type with low herbs and three blocks on moist dwarf‐shrub type. The number of sprouting stumps was correlated with relative light intensity and forest type. 2.5 % of the stumps of mesic and 14 % of moist forest type did not produce suckers. On mesic forest type, 7% of the stumps exposed to 10% light did not sprout compared with 1.4, 3.0 and 0% at 25, 50 and 100% light, respectively. At stump height 0 cm fewer sprouting stumps were produced than at 10 cm. The mean height of suckers was significantly lower at 10% light intensity than at other levels. The number of suckers per sprouting stump was not related to light intensity but to forest type. More suckers were produced on mesic than on moist forest type. The dry weight of suckers was significantly lower at 10 and 25% relative light intensity than at 50 and 100%. On moist forest type, the dry weight of suckers was lower than on mesic forest type. 相似文献
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[目的]为红叶李的商品化生产、遗传转化和品种定向改良奠定基础。[方法]以红叶李茎段为外植体,在MS、1/2MS基本培养基中添加不同浓度的6-BA和NAA,研究不同激素浓度对红叶李增殖和生根的影响,建立红叶李的离体繁殖体系。[结果]适量浓度的6-BA和NAA组合比单独使用6-BA诱导率高,处理⑤(6-BA、NAA的浓度分别为1.0、0.2mg/L)的诱导率达75.0%,且腋芽生长良好。处理⑥(6-BA、NAA的浓度分别为2.0、0.2mg/L)的增殖系数为7.67,芽苗高度大于2cm的芽数为4.76。适合红叶李生根的最佳IBA浓度为0.5mg/L,生根率达98.3%。试管苗移栽成活率达85%以上。[结论]红叶李离体培养的最佳启动培养基为MS+6-6-BA1.0mg/L+NAA0.2mg/L,最佳增殖培养基为MS+6-BA2.0mg/L+NAA0.2mg/L,最佳生根培养基为1/2MS+IBA0.5mg/L。 相似文献
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【目的】分析4种杏属植物种仁的主要营养成分,为其开发利用提供理论依据。【方法】通过溶剂法测定普通杏(Armeniaca vulgaris Lam.)、西伯利亚杏(Armeniaca sibirica(L.)Lam.)、仁用杏(Kernel-using apricots)、紫杏(Armeniaca dasycarpa(Ehrh.)Borkh.)种仁的粗脂肪含量,用凯氏定氮法测定其总蛋白含量,使用马弗炉测定其灰分含量,使用GC-MS测定其脂肪酸种类及比例,并用氨基酸自动分析仪测定其氨基酸种类及含量。【结果】4种杏属植物的粗脂肪含量为474.4~523.4g/kg,仁用杏最高;总蛋白含量为278.4~346.2g/kg,紫杏最高;灰分含量为24.4~37.9g/kg,紫杏最高。共分离出6种主要脂肪酸,其中饱和脂肪酸的相对含量为3.85%~7.68%,普通杏最高;不饱和脂肪酸的相对含量为91.33%~95.85%,西伯利亚杏最高;油酸的相对含量为62.58%~74.67%,仁用杏最高;亚油酸的相对含量为19.50%~29.90%,西伯利亚杏最高。4种杏种仁均测定出18种氨基酸,氨基酸总量为272.5~325.2g/kg,包括人体8种必需氨基酸,其总含量为72.7~84.1g/kg,组氨酸含量为7.1~8.5g/kg。【结论】4种杏属植物种仁含油量高,不饱和脂肪酸含量高,为优质的油料;蛋白质含量高,均含18中氨基酸,是优质的植物蛋白。 相似文献
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新疆野生樱桃李S-RNase基因分离与鉴定的初步研究 总被引：2，自引：1，他引：1
从4对已报道的李属树种S-RNase基因引物组合中筛选出扩增效果较好的PruC2和PruC4R组合,首次对新疆野生樱桃李（Prunus cerasifera Ehrh.）的45个株系的基因组DNA进行S-RNase基因特异性PCR扩增,并对其PCR产物进行克隆测序。这些核酸序列及其相应的氨基酸序列在GenBank中进行比对, 皆与李属的S-RNase基因有最大同源性,为新疆野生樱桃李的4种S-RNase基因,分别命名为S1 （511 bp）,S2 （787 bp）,S3 （1859 bp）和S4 （464 bp）,在GenBank的登录号分别为EF638726、EF641276、EF661873和EF661874。45个株系中,43个株系的S基因型分别为S1S2、S1S3、S2S3、S2S4和S3S4,而10号和15号株系分别只鉴定了一种S-RNase基因,其S基因型组成有待于进一步研究。 相似文献
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介绍了黑樱桃在原产地美国的分布范围，适生条件，生长发育习性，经济价值和用途。分析了黑樱桃在我国可能适生的范围和引种发前景。 相似文献
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Thierry Koumbi-Mounanga Daniela Tudor Brigitte Leblon Kevin Groves Paul A. Cooper Tony Ung 《Wood material science & engineering》2018,13(4):204-221
A combination of statistical techniques of analyses were used to evaluate the potential of International Commission on Illumination (CIE) lightness (L*), redness (a*) and yellowness (b*) colour space system and near-infrared spectroscopy (NIRS) to assess surface changes in relation with progressive decay of beech (Fagus grandifolia Ehrh.) by wood-inhabiting lignicolous fungi Inonotus hispidus, Trametes versicolor and Xylaria polymorpha. pH effects based modelling predictions of beech earlywood and latewood tissues were also included. Multivariate analysis techniques included response surface optimization, sample-specific standard error of prediction (SEP) method and projection to latent structures partial least squares (PLS) regression. Strong statistical relationships were derived for pH predictions with R2 values ranged: from 0.77 to 0.84 for I. hispidus; from 0.77 to 0.84 for T. versicolor and from 0.83 to 0.91 for X. polymorpha. R2 values for CIE-based L*a*b* colour space measurements ranged: from 0.43 to 0.69 (L*), 0.66 to 0.76 (a*), 0.42 to 0.53 (b*) for I. hispidus; from 0.59 to 0.69 (L*), 0.69 to 0.79 (a*), 0.64 to 0.79 (b*) for T. versicolor; and from 0.51 to 0.75 (L*), 0.89 to 0.94 (a*), 0.85 to 0.89 (b*) for X. polymorpha. Multivariate technical analysis (response surface analysis, sample-specific SEP, PLS regression) of CIE L*a*b* system and NIRS results should be able to characterize pH effects and surface changes of wood spalted by lignicolous fungi as a quick and reliable non-destructive method relevant to wood-spalting concerns and the forest products industry. 相似文献
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《Scandinavian Journal of Forest Research》2012,27(1-4):355-370
Observed diameter distributions of forest stands are adapted to the Johnson S b probability function. The stands investigated are untreated mixed stands of Norway spruce (Picea abies (L.) Karst.) and birch (Betula pendula Roth and Betula pubescens Ehrh.) aged between 20 and 32 years. The adaptation of the Johnson Sb probability function is made both on mixed spruce and birch, and on each species separately. Altogether 156 observations were tested with observed distributions against calculated distributions in the Kolmo‐gorov‐Smirnov test. The fractiles are predicted with multiple regression and two multivari‐ate techniques, simultaneous‐equation models (multivariate regression) and partial least squares with latent variables. The independent variables are characteristics of site and stand. Both multivariate methods predict diameter distribution well when tested. 相似文献
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《Scandinavian Journal of Forest Research》2012,27(1-4):491-512
The individual tree growth in stands of mixed Norway spruce (Picea abies (L.) Karst.) and birch (Betula pendula Roth & Betula pubescens Ehrh.) is estimated using basal area and height growth functions for each species separately. The individual tree growth models are distant dependent and the number, size and proximity of neighbours are expressed as size‐ratio competition indices. The competition indices were calculated using a basal area factor gauge to define competitors. The tree growth functions are based on data from nine mixed stands of Norway spruce and birch. The recursive multivariate regression approach is used. The growth functions have standard deviation about the function/standard deviation about the mean (sf/sm) values between 31 and 61% and the evaluations made with root mean square error (rmse) give estimates which vary between 8 and 45 % of the observed mean value. These values are comparable with the precision reported in other studies. In the present investigation the distant dependent indices are important independent variables. It seems suitable to describe the change in growth conditions from retarded to released growth by means of size ratio competition indices. For birch, a positive effect on growth is obtained the more the total competition consists of Norway spruce. For Norway spruce a negative effect on growth is obtained the more the total competition consists of Norway spruce. The lower competitors have a positive effect on the growth of the spruce trees. The interpretation should be that it is better to have a small competitor than a larger one, not that small competitors as such have a positive effect on growth of Norway spruce. 相似文献
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Aniko Horvath Emilie BalseminJean-Claude Barbot Hélène ChristmannGeorges Manzano Patrick ReynetFrédéric Laigret Stéphanie Mariette 《Scientia Horticulturae》2011
In the present study, phenotypic variability of 80 plum (Prunus domestica L.) varieties maintained in the French National Plum Collection was evaluated with 19 quantitative traits. In addition, genetic diversity and genetic structure was studied in three plum species (P. domestica L., Prunus cerasifera Ehrh. and Prunus spinosa L.) using chloroplast DNA (cpDNA) markers and five single sequence repeat (SSR) loci. Based on phenotypic traits, some varieties, such as mirabelle plums, grouped together. Bayesian structure analysis was used to identify different genetic groups, whereby damson plums were clearly distinguished from greengage plums. When examining the three species together, a higher level of cpDNA allelic richness was found in P. cerasifera and in P. spinosa than in P. domestica where only five cpDNA haplotypes were detected in the national plum collection, with one main haplotype that accounted for 80% of the varieties studied. P. domestica cpDNA haplotypes tended to group together with P. cerasifera haplotypes whereas most of P. spinosa haplotypes formed a separate cluster. SSR markers were somewhat able to distinguish the three species. These results provide some clues as to the origin of plum and the various plum varieties. Our results also provide useful information for the management of plum genetic resources. 相似文献