共查询到18条相似文献，搜索用时 156 毫秒
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本文对金花茶与防城金花茶作了核型研究和比较,发现这两种金花茶的核型有所差异。根据Levan等的分类原则,其核型公式分别为金花茶2n=2x=30=22m(2SAT)+8sm;防城金花茶2n=2m=30=20m(2SAT)+10sm。这两种金花茶都是二倍体种,未发现多倍体。核型的不对称性表明,这两种金花茶均属于Stebbins核型分类的2A型核型。从这两种金花茶的核型差异和其形态特征、花粉形态的不同来看,把防城金花茶(Camellia nitidissima var·Phaeopubisperma S·Y·Liang et Z·H·Tang,Var·Nov·)作为金花茶(Came-llia nitidissima Chi)的变种是恰当的。 相似文献
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作者通过对13个现代月季品种的染色体数目的观察和12个品种的核型分析,得到以下结果:‘明星’(‘Super Star’)2n=4X=28=24m+4sm,核型为1A型;‘墨红’(‘Crimson Glory’)2n=4x=28=28m,核型为1A型;‘粉和平’(‘Pink Peace’)2n=4x=28=28m,核型为1A型;‘钮扣黄’(‘Goldilocks’)2n=4x=28=20m+8sm,核型为1A型;‘卖花女’(‘Flower Girl’)2n=4X=28=24m+4sm,核型为1A型;‘杏花村’(‘Betty Prior’)2n=3x=21=21m,核型为1A型;‘法国小姐’(‘MissFrance’)2n=4x=28=28m,核型为1A型;‘白雪山’(‘Mount Shasta’)2n=4x=28=28m,核型为1A型;‘二重奏’(‘Duet’)2n=4x=28=28m,核型为1A型;‘金光’(‘Gold Glow’)2n=4x=28=28m,核型为1A型;‘花旗藤’(‘American Pillar’)2n=3x=21=18m+3sm,核型为1A型;‘桃色奶油’(‘Peaches’Cream’)2n=3x=21=21m,核型为1A型;‘博尼卡’(‘Bonica’)2n=3x=21.文中对现代月季品种的起源及其表现型在细胞遗传上的体现,进行了初探。 相似文献
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八个杉木地理种源的核型分析 总被引：2，自引：0，他引：2
对八个杉木不同地理种源进行核型分析,结果表明,其染色体数目均为2n=12,其中广西融水杉木的核型公式为2n=22=22m(2SATs),其他种源第7对染色体为近中着丝粒,核型公式为2n=22=20m(2SATs)+2sm。核型类型为1B,第4对染色体短臂上有一对随体。融水杉木少数分裂相发现有一条B染色体,在研究中发现,同源染色体两成员长度差异对数多(核型杂合程度高)的种源,均系属于优良种源。而差异对数少的种源为一般种源(会同杉木除外),核型杂合程度的高低。可作为判定种源优劣的一种标志。 相似文献
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Condensation of lignin during heating of wood 总被引：3，自引：0，他引：3
Summary The structural change of lignin during heating of wood was investigated quantitatively by a method combining nucleus exchange and nitrobenzene oxidation. Lignin modification during heating was mainly a diphenylmethane type condensation. About 40 and 75% of noncondensed units in protolignins were converted to diphenylmethane type units by heating of dry and wet wood meals up to 220 °C, respectively. On the other hand, during heating of modified lignin (dioxane lignin) various types of modifications in addition to diphenylmethane type condensation occurred. Lignin modification via the diphenylmethane type condensation was proposed as a new route for its utilization. 相似文献
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Satoko Shimizu Pattaraporn Posoknistakul Takuya Akiyama Tomoya Yokoyama Yuji Matsumoto 《Journal of Wood Science》2018,64(5):664-674
The reaction products of an alkaline treatment of non-phenolic β-O-4-type lignin model compounds (C6–C2-type) consisting of p-hydroxyphenyl (H), guaiacyl (G), and/or syringyl (S) nuclei were identified and quantified. This was performed to examine how the type of H, G, or S nucleus affect the reaction product profiles. The major identified and quantified reaction products were phenol derivatives that were liberated from the aryl sides of the β-O-4 ether bonds of the lignin model compounds. Other products included derivatives of phenylethane-1,2-diol (glycol-type), benzaldehyde, and acetophenone, which originated from the alkyl sides of the β-O-4 ether bonds of the lignin model compounds. Although the type of aromatic nucleus of the aryl side of the β-O-4 ether bond of the lignin model compounds did not significantly affect the profile of the reaction products, the type of the alkyl side nucleus was influential. The glycol-type compound was the exclusive major reaction product when the S nucleus was on the alkyl side of the β-O-4 ether bond. On the other hand, when the H or G nucleus was present, a benzaldehyde derivative was the other major reaction product. 相似文献
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林业管理体制是研究林业发展战略的中心议题,是深化改革的核心。本文对世界林业机构设置类型和管理体制模式进行了探讨。根据机构的性质和任务,把世界林业管理体制划分为两大模式:政企合一和政企分离。当今,实行政企分离,独立经济核算,走企业化的道路,是一个明显的发展趋势。 相似文献
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Zhang ShiNortheast Forestry University 《林业研究》1991,2(1):98-107
In this paper,the components of furfural residue are analyzed.Total sugar contentoccupies47.36％ of absolute drying residue,and glucose occupies 83.23％ of total sugar content.Bycombining the phenyl nucleus exchange reaction with nitrobenzene oxidation,the quantity of struc-tural units of phenyl nuclei was determined,products from syringyl units occupy 50％ of klasonlignin Especially,diphenyl methane type syringyl units occupy 38.80％,and guaiacyl units 25％,other condensed guaiacyl units about 20％.The furfural residue is not a good material for the manu-facture of adhesives,but for active carbon.The yield of furfural residue may achieve about 350thousand tons per year,but it has not been used in industry in China. 相似文献
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楸树叶面积与叶形指数的回归分析 总被引：7，自引：0，他引：7
本实验采用数码相机拍照,利用CAD．图像处理方法得到楸树叶片的面积,并同时测量叶长、叶宽计算出长宽比、长乘宽,通过逐步回归的方法对与叶面积有关的指标进行筛选。用最后得到的最能反映叶面积的指标长乘宽,建立不同叶形的叶片长乘宽与叶面积的一元线形回归预测模型方程,分别是倒心形Y=0．652x＋16．041,决定系数R2=0．7221,水滴形Y=0．5058x＋112．47,决定系数R2=0．4994,三裂Y=0．3211x＋155．98,决定系数R2=0．6006,分析认为可将叶长乘宽作为重要的叶形指数,进行楸树生长等相关研究。 相似文献
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IntroductionZOtheni8ruf8scent8rtaMotsch.isoneofthemainpestsinlarchpIantationinNortheastChina.Inrecentyears,thepestcauseddisasterintheforestareaofHeilongjiangProvince.TheneedlesofIarchinsomeareawerebeeneatenupcompIetelyandthegrowthoflarchpIantationwasseriousIyaffected.Thenu-clearpoIyhedrosisvirusofZruf8scent8rinMotsch(ZrNPV)wasobtainedfromtheIarvaeofZruf6s-cent8finMotsch,in1991.ZrNPVwasmainpathogenOftheIarvaeofZrufescentBfisMotsch.TOxicitymeasuringindoorsandinvestigationinfieldprov… 相似文献