共查询到20条相似文献，搜索用时 421 毫秒
1.
利用染色体常规压片法,对毛百合(2n=2x=24)×布鲁拉诺(2n=4x=48)杂交后代核型进行了研究。结果表明：杂交后代MB70-48染色体数为2n=2x=24,而MB70-30、MB72-6、MB71-5染色体数为2n=3x=36。毛百合核型公式为2n=2x=24=2m+4sm+12st+6t,布鲁拉诺核型公式为2... 相似文献
2.
以5个苦瓜(Momordica charantia L.)地方品种的种子为试材,利用去壁低渗火焰干燥法进行染色体核型分析。结果表明:5个苦瓜地方品种均为二倍体(2n=2x=22),其核型公式如下:品种134-2的核型公式为2n=2x=22=20m+2sm,属1A核型;品种76-4-5的核型公式为2n=2x=22=18m+4sm,属2A核型;品种70-5-2的核型公式为2n=2x=22=20m+2sm,属1A核型;品种10-3-8的核型公式为2n=2x=22=18m+4sm,属2A核型;品种57-7-2的核型公式为2n=2x=22=20m+2sm,属2A核型。 相似文献
3.
本文报道了在刺玫月季育种中使用的6个亲本和4个F_1代杂种的染色体数目和核型。染色体数目及形态,亲本报春刺玫2n=2x=14=14m,单瓣黄刺玫2n=2x=14=14m,黄蔷薇2n=4x=28=28m,‘粉后’2n=4x=28=20m+8sm,‘秋水芙蓉’2n=4x=28=24m+4sm,‘丹凤朝阳’2n=4x=28=28m(2SAT);杂交种8401(报春刺玫ב早霞’)2n=2x=14=12m+2sm,8601(‘粉后’×黄蔷薇)2n=4x=28=28m,8703(‘丹风朝阳’×报春刺玫)2n=4x=28=28m,8706(‘秋水芙蓉’×报春刺玫)2n=3x=21=15m+6sm。核型均为1A型。文中讨论了与刺玫月季育种有关的细胞遗传学问题。 相似文献
4.
Most of the earth's mantle is made up of high-pressure silicate minerals that contain octahedrally coordinated silicon (Si(VI)), but many thermodynamically important details of cation site ordering remain unknown. Silicon-29 nuclear magnetic resonance (NMR) spectroscopy is potentially very useful for determining short-range structure. A systematic study of silicon-29 chemical shifts for Si(VI) has revealed empirical correlations between shift and structure that are useful in understanding several new calcium silicates. The observed ordering state of a number of high-pressure magnesium silicates is consistent with the results of previous x-ray diffraction studies. 相似文献
5.
Dynamic compression of Earth materials 总被引：1，自引：0，他引：1
Ahrens TJ 《Science (New York, N.Y.)》1980,207(4435):1035-1041
Shock wave techniques have been used to investigate the pressuredensity relations of metals, silicates, and oxides over the entire range of pressures present in the earth (3.7 x 10(6) bars at the center). In many materials of geophysical interest, such as iron, wüstite, calcium oxide, and forsterite, major shock-induced phase changes dominate the compression behavior below pressures of 10(6) bars. The shock wave data for the high-pressure phases of these minerals lead to important inferences about the composition of the lower mantle and outer, liquid core of the earth. The lower mantle of the earth appears to have a slightly higher density than is inferred to correspond to the behavior of an olivine-rich assembiage of the same composition as the upper mantle. The core has a density some 10 percent less than that of pure iron and may have 9 to 12 percent sulfur or about 8 percent oxygen by weight. 相似文献
6.
对牛角辣椒‘绿龙9号’,朝天椒‘天鹰’,小果番茄‘绿玛瑙’,圆形茄‘快青’,野生茄‘红刺茄’和‘托鲁巴姆’的染色体核型进行了分析和比较。结果表明:染色体数均为2n=2x=24,且均具有1对带随体的染色体;染色体长度茄子约在3～5μm、辣椒约在5～7μm、番茄约在2～4μm;辣椒‘绿龙9号’和‘天鹰’的核型公式分别为2n=2x=24=18m+4sm(2SAT)+2st和2n=2x=24=18m(2SAT)+6sm,核型类别分属2B和2A;番茄‘绿玛瑙’的核型公式为2n=2x=24=14m(2SAT)+8sm+2st,核型类别属2C;茄子‘快青’的核型公式为2n=2x=24=20m+4sm(2SAT),核型类别属2A;野生茄‘红刺茄’和‘托鲁巴姆’的核型公式分别为2n=2x=24=20m(2SAT)+4sm和2n=2x=24=22m(2SAT)+2sm,核型类别分属2A和1A。 相似文献
7.
毛百合×有斑百合种间杂种的核型研究 总被引：2，自引：1，他引：1
利用染色体常规压片方法,对毛百合、有斑百合及其3个杂种后代进行了核型分析.结果表明:毛百合、有斑百合和3个杂种染色体均为2n=2x=24.毛百合核型公式为2n=6m(2SAT)+4sm(2SAT)+14st,有斑百合核型公式为2n=2m+8sm+12st+2t,杂种F1-1核型公式为2n=4m+2am+18st,F1-2核型公式为2n=2m+8sm(2SAT)+14st,F1-3核型公式为2n=2m+8sm+14st.F1-1、F1-2和母本的核型类型都是3B型,而F1-3与父本的核型类型都是3A型.在染色体长度比、平均臂比及不对称系数等指标上,杂种大部分都趋于父母本的中间值.杂种染色体形态具有父母本双亲的特点,可以鉴定为真杂种. 相似文献
8.
我们观察研究了燕麦属(Avena)中不同倍性三个种的染色体数目和核型。结果如下:砂燕麦Avena strigosa为二倍体,2n=2X=14,核型公式是2n=2X=14=10m+4sm(2SAT),核型类型为2A;野生大燕麦Avena magna为四倍体2n=4X=28,核型公式是2n=4X=28=16m+12Sm(2SAT),核型类型为2A;裸燕麦(莜麦)Avena nuda为六倍体2n=6X=42,核型公式是2n=6X=42=22m+20sm(2SAT),核型类型为2B。从核型结果中可以看出,多倍化是三个种进化重要趋势,随着倍性的增加,核型的不对称性也增加。 相似文献
9.
对以色列野生二粒小麦（母本）和光稃野燕麦（父本）远缘杂交亲本与后代的核型及进化关系进行了分析。结果表明：母本的染色体长度比为1626,核型公式为2n=4x=28=18m（2SAT）+10sm（2SAT）,核型为1A。父本的染色体长度比为2526,核型公式为2n=6x=42=20m（2SAT）+22sm（4SAT）,核型类型为2B。以色列野生二粒小麦和光稃野燕麦杂交后代0878株系的染色体数目为42,染色体长度比为1.802,核型公式为2n=6x=42=22m（2SAT）+20sm（2SAT）,核型为2A。 0878-1株系的染色体数目为42,染色体长度比为2.057,核型公式为2n=6x=42=38m+4sm（4SAT）,核型为2B。由于光稃野燕麦遗传物质渗入到该杂交后代,获得了进化程度高于其母本的普通小麦型小麦新种质。 相似文献
10.
《农业科学学报》2010,(11)
Elytrigia Desv. is widely distributed throughout the world and is represented with species of various levels of ploidy including diploids, tetraploids, hexaploids, octaploids, and decaploids. The distribution pattern of these ploidy levels, however, is not well-defined. In this study, the levels of ploidy for 64 accessions of Elytrigia from 25 countries were determined with microscopic procedures. The results showed that accessions of E. intermedia and E. repens were grouped into three distinct levels of ploidy including diploids, tetraploids and hexaploids. For E. elongata, E. pontica, and E. caespitosa, it was found that two ploidy levels presented, and only one ploidy level was in those of E. hybrid, E. pycnantha, E. pungens, E. juncea, and E. alatavica. Karyotype analysis indicated that the karyotype formula of diploid, tetraploid and hexaploid of E. intermedia was 2n = 2x = 14 = 6m + 6sm + 2st, 2n = 4x = 28 = 2M + 10m + 16sm and 2n = 6x = 42 = 4M + 18m + 20sm, respectively. Furthermore, the karyotype formula of three germplasms in tetraploid of E. intermedia was 2n = 4x = 28 = 2M + 10m + 16sm, 2n = 4x = 28 = 4M + 22m (sat) + 2sm and 2n = 4x = 28 = 4M + 12m + 12sm (sat), which were not completely uniform. Therefore, it could be suggested that the studies about chromosome constitution would be helpful for the detail understanding of the diversity of germplasm resource in Elytrigia and promoting the utilization in the crop molecular breeding. 相似文献
11.
Elytrigia Desv.is widely distributed throughout the world and is represented with species of various levels of ploidy including diploids,tetraploids,hexaploids,octaploids,and decaploids.The distribution pattern of these ploidy levels,however,is not well-defined.In this study,the levels of ploidy for 64 accessions of Elytrigia from 25 countries were determined with microscopic procedures.The results showed that accessions of E.intermedia and E.repens were grouped into three distinct levels of ploidy including diploids,tetraploids and hexaploids.For E.elongata,E.pontica,and E.caespitosa,it was found that two ploidy levels presented,and only one ploidy level was in those of E.hybrid,E.pycnantha,E.pungens,E.juncea,and E.alatavica.Karyotype analysis indicated that the karyotype formula of diploid,tetraploid and hexaploid of E.intermedia was 2n=2x=14=6m+6sin+2st,2n=4x=28=2M+10m+16sm and 2n=6x=42=4M+18m+20sm,respectively.Furthermore,the karyotype formula of three germplasms in tetraploid of E.intermedia was 2n=4x=28=2M+10m+16sm,2n=4x=28=4M+22m(sat)+2sm and 2n=4x=28=4M+12m+12sm(sat),which were not completely uniform.Therefore,it could be suggested that the studies about chromosome constitution would be helpful for the detail understanding of the diversity of germplasm resource in Elytrigia and promoting the utilization in the crop molecular breeding. 相似文献
12.
黄肉桃品种染色体核型分析 总被引：1，自引：0，他引：1
试验采用去壁、低渗、火焰干燥法，对黄肉桃品种金童６、费雷德里克、新泽西洲３号（ＮｊＣ３号）的染色体核型进行了分析，其核型组成分别为：２ｎ＝１６＝２ｍ＋１０ｍ＋２Ｍ＋２ｍ（ＳＡＴ）、２ｎ＝１６＝４ｍ＋８ｓｍ＋２Ｍ＋２ｍ（ＳＡＴ）、２ｎ＝１６＝１２ｍ＋２Ｍ＋２ｍ（ＳＡＴ），其核型分类分别为１Ｂ、２Ｂ、１Ｂ型。 相似文献
13.
野红燕麦Ａｖｅｎａ，ｓｔｅｒｉｌｉｓ和小粒裸燕麦Ａｖｅｎａ．ｎｕａｉｄｒｅｖｉｓ，是燕麦属Ａｖｅｎａ中染色体数目呈不同倍数的种。我们对这２个种的染色体数目及其核型进行了观察研究。野红燕麦是六倍体２ｎ＝６Ｘ＝４２，染色体核型公式为２ｎ＝６Ｘ＝４２＝２２ｍ＋１８ｓｍ（２ＳＡＴ）＋２ｓｔ，核型类别为２Ｂ；小粒裸燕麦是二倍体２ｎ＝２Ｘ＝１４，染色体核型公式为２ｎ＝２Ｘ＝１４＝６ｍ＋４ｓｍ（２ＳＡＴ）＋４ｓｔ，核型类别为２Ａ。 相似文献
14.
参照李懋学和Stebbins的方法,对细叶百合、兰州百合、亚洲百合("精粹"和"托里诺")进行了染色体数目鉴定和核型分析。结果表明:细叶百合和兰州百合为二倍体种,核型公式分别为2n=2x=24=2m+4sm(2SAT)+8st+10t和2n=2x=24=10sm(4SAT)+6st+8t,分属3A和3B型;"精粹"百合和"托里诺"百合为三倍体种,核型公式分别为2n=3x=36=3 m+6sm+18st+9t和2n=3x=36=3 m+3sm+12st+18t,均为3B型。此外,细叶百合、"精粹"百合和"托里诺"百合株间或细胞间均存在着染色体数目变异。 相似文献
15.
山茶属5种植物的核型研究 总被引：5，自引：0，他引：5
本文报道了山茶属5种植物的核型:1.矩叶茶Camellia grijsii Hance核型公式为2n=2x=30=20m+7sm+3st;2.文山毛蕊茶C.wenshanensis Hu核型公式为2n=2x=30=20m+8sm+2st;3.紫果茶C.purpura Chang et Chen核型公式为2n=2x=30=22m+4sm+4st;4.显脉金花茶C.euphelebia Merr.ex Sealy核型公式为2n=2x=30=21m(4sat)+9sm(2sat);5.五柱滇山茶C.yunnanensis(Pitard ex Diels)Cohen Stuart核型公式为2n=2x=30=26m(2sat)+4sm.这5种植物分属不同的亚属及组.结果表明它们均是二倍体2n=30,但核型结构明显不同.核型类型前2种属2A型,后3种属2B型. 相似文献
16.
MAO Pei-sheng HUANG Ying WANG Xin-guo MENG Lin MAO Pei-cbun ZHANG Guo-fang 《中国农业科学(英文版)》2010,9(11):1553-1560
Elytrigia Desv. is widely distributed throughout the world and is represented with species of various levels of ploidy including diploids, tetraploids, hexaploids, octaploids, and decaploids. The distribution pattern of these ploidy levels, however, is not well-defined. In this study, the levels of ploidy for 64 accessions of Elytrigia from 25 countries were determined with microscopic procedures. The results showed that accessions of E. intermedia and E. repens were grouped into three distinct levels of ploidy including diploids, tetraploids and hexaploids. For E. elongata, E. pontica, and E. caespitosa, it was found that two ploidy levels presented, and only one ploidy level was in those of E. hybrid, E. pycnantha, E. pungens, E. juncea, and E. alatavica. Karyotype analysis indicated that the karyotype formula of diploid, tetraploid and hexaploid of E. intermedia was 2n = 2x = 14 = 6m ＋ 6sm ＋ 2st, 2n = 4x = 28 = 2M ＋ 10m ＋ 16sm and 2n = 6x = 42 = 4M ＋ 18m ＋ 20sin, respectively. Furthermore, the karyotype formula of three germplasms in tetraploid of E. intermedia was 2n=4x=28 =2M＋ 10m＋ 16sm, 2n=4x=28=4M＋22m （sat）＋2sm and 2n=4x=28 =4M＋ 12m＋ 12sm （sat）, which were not completely uniform. Therefore, it could be suggested that the studies about chromosome constitution would be helpful for the detail understanding of the diversity of germplasm resource in Elytrigia and promoting the utilization in the crop molecular breeding. 相似文献
17.
吉林省3种萱草的核型研究 总被引：5，自引：0，他引：5
本文对吉林省３种萱草进行了细胞学观察，其染色体数目和核型报道如下：北京黄花菜Ｈｅｍｅｒｏｃａｌｌｉｓｌｉｌｉｏ－ａｓｐｈｏｄｅｌｕｓＬ．２ｎ＝２２＝１０ｍ＋６ｓｍ＋４ｓｔ＋２Ｔ；小黄菜菜Ｈ．ｍｉｎｏｒＬ．２ｎ＝２２＝４ｍ＝１４ｓｍ＋２ｓｔ（２ＳＡＴ）＋２Ｔ ；重瓣萱草Ｈ．ｆｕｌｖａＬ．ｖａｒ．ｋｗａｎｓｏＲｅｇｅｌ为三倍体，２ｎ（３ｘ）＝３３＝１８ｍ＋９ｓｍ＋３ｓｔ＋３Ｔ，３个种的核型均属于２Ｂ型 相似文献
18.
本文采用经改良的常规制片法，对上农香糯、上农黑糯０７、太湖糯、铁桂丰四个品种及其杂交后代选系进行染色体核型分析。试验表明，它们的体细胞染色体核型，都是２ｎ＝２ｘ＝２４，但核型形式略有不同。按臂比值而定的着丝点位置有两种类型，即中央着丝点（ｍ）染色体和近中着丝点（ｓｍ）染色体，因此它们均为对称染色体核型。１２对同源染色体中，有一对是随体染色体。 相似文献
19.
本文研究了我国原产的山茶属植物东兴金花茶(Camellia tunghinensis chang.)、平果金花茶(C.Pingguoensis D.Fang),毛籽金花茶(C.ptilos perma S.Y.Liang et Q.D.Chen)、凹脉金花茶(C.impressifZeruis Chang et S.Y.Liang)、金花茶(C.chrgsantha(Hu)Tugama)、毛瓣金花茶(C.pubipetala Y.Wan et S.Z.Huang)、小果金花茶(C.chrgsantha var.microcarpa S.L.M et S.Z.Huang)、广宁红花油茶(C.semiserrata C.W.Chi)、苑田红花油茶(C.polyodonta Chun et How)、腾冲红花油茶(C.riticulata f.simplex)、五宝山茶(C.japonica L.‘Wabao’)、云南大叶茶(C.sinrnsis var macrophylla Sieb.)、共12个种、变种和品种的染色体数目。除腾冲红花油茶2n=90外,其余的2n=30,并研究了其中3个种、变种和品种的核型:毛瓣金花茶为2n=2x=30=26m(2SAT)+4sm;小果金花茶为2n=2x=30=24m(2SAT)+6sm,五宝山茶为2n=2x=30=24m(2SAT)+6sm(2SAT) 7个种、变种和品种的染色体数目和其中3个核型为首次报道。 相似文献
20.
单瓣和重瓣花中国水仙的核型比较 总被引：2，自引：0，他引：2
以中国水仙(Narcissus tazetta var.chinensis)为材料,研究了不同预处理对根尖细胞中期分裂指数的影响,并对单瓣和重瓣花中国水仙的核型进行了比较和分析。结果表明:用α-溴萘饱和水溶液在活体条件下处理根尖4 h,中期细胞的分裂指数最高,且染色体分散、清晰;单瓣和重瓣花中国水仙均为同源三倍体;单瓣花的核型公式为2n=3x=30=6m+6sm+18st(3SAT),核型类型为3C;重瓣花为2n=3x=30=6sm+24st(6SAT),核型类型为进化程度更高的4C。 相似文献