共查询到10条相似文献，搜索用时 187 毫秒
1.
A report of chromosome numbers for eight species endemic to China is
made in the paper, including first counts for 4 genera and 4 species and first karyoty-
pic analyses of two species.
Sinojohnstonia chekiangensis (Migo) W. T. Wang (Boraginaceae) 2n=24*;
Coptis chinenis Franch (Ranunculaceae) 2n=18**;
Dichocarpum dalzielii (Drumm. et Hutch.) W. T. Wang et Hsiao (Ranunculaceae)
2n=24*;
Eomecon chionantha Hance (Papaveraceae) 2n=18;
Camptotheca acuminata Dcne. (Nyssaceae) 2n=44;
Calycanthus chinensis Cheng et S. Y. Chang (Calycanthaceae) 2n=22**;
Eucommia ulmoides Oliv. (Eucommiaceae) n=17;
Pinellia pedatisecta Schott (Araceae) 2n=26;
The previous reports of chromosome numbers of the same groups are compared with
our own (See Table 1). The vouchers for the present study are preserved in the Herba-
rium of Futan University. 相似文献
2.
本文对江西、浙江、四川的万年青Rohdea japonica，开口箭Tupistra chinensis、筒花开口箭
T．delavayi、金山开口箭T．jinshanensis以及弯蕊开口箭T.wattii的核型进行了分析，其中筒花开
口箭、金山开口箭和弯蕊开口箭的核型为首次报道。万年青属的基本核型为2n=38＝26m十10sm十
2st；开口箭属的基本核型为2n=38＝26m+12sm，两者极为相似。本文还对万年青属、开口箭属
与其邻近属——铃兰属Convallaria、吉祥草属Reineckia、白穗花属Speitantha，蜘蛛抱蛋属Aspi-
distra等的核型进行了分析讨论。 相似文献
3.
百合科六属十五种植物的细胞学研究 总被引：2，自引：0，他引：2
本文对云南西北部百合科6属15种的染色体和核型进行了报道。 (1)Clintonia udensis Trautv．et Mey间期核属于浓密分散型，前期染色体属于渐变型，分裂中期体细胞染色体2n=14=8m+4sm+2st(2SAT)，核型不对称性属于2A型；(2)鹿药属四个种间期核属于复杂中央微粒型，前期染色体属于中间型，分裂中期体细胞染色体分别为Smilacina henryi(Baker)Wang et Tang，2n=36=12m+16sm+6st+2t(2SAT)， 核型不对称性属于2C型；Smilacina fusca Wall., 2n=36=14m(2SAT)+12sm+10st(2SAT)， 核型不对称性属于2B型； Smilacina tatsienensis(Franch．)Wang et Tang， 2n=36=22m+2sm+2st(2SAT)， 核型不对称性属于2C型；Smilacina atropurpurea(Franch．)Wang et Tang，2n=36=18m+6sm(2SAT)+12st，核型不对称性属于2C型；(3)黄精属四个种的间期核属于复杂中央微粒型，前期染色体属于中间型，分裂中期体细胞染色体分别为Polygonatum kingianum Coll．et Hesml．，2n=30=12m(2SAT)
+6sm+lst+2t， 核型不对称性属于2C型； Polygonatum cirrhifolium(Wall．) Royal，2n=30=10m+4sm+12st+4t， 3C型； Polygonatum curvistylum Hua， 2n=78=24m(2SAT)+14sm(6SAT)+40st， 核型不对称性属于3C 型； Polygonatum cathcartii Baker，2n=32=12m+6sm+10st+2t+2bs，核型不对称性属于2C型；(4)百合属，假百合属，豹子花属三个属的间期核和前期染色体形态相似，都属于复杂中央微粒型，前期染色体属于中间型，分裂中期体
细胞染色体分别为Lilium henricii Franch，2n=24=2m(2SAT)+2sm+10st+10t，核型不对称性属于3A型；Lilium bakerianum Coll．et Hesml．var． rubrum Stearn， 2n=24=4m (2SAT)+10st+10t(2SAT)，核型不对称性属于3A型；Nomocharis bilouensis Liang 2n=24=2m(2SAT)+2sm+12st+8t，核型不对称性属于3A型；Nomocharis pardanthina Franch．，2n=24=4m(2SAT)+12st (2SAT)+8t，核型不对称性属于3A型；Nomocharis sauluensis Balf, f.,2n=24=4m(2SAT)+10st(2SAT)+10t，核型不对称性属于3B型；Notholirion campanulatum Cotton et Stearn2n=24=2m(2SAT)+2sm+14st(2SAT)+6t，核型不对称性属于3A型。 相似文献
4.
领春木的染色体数目及配子体的发育 总被引：1，自引：0，他引：1
本文报道了领春木属的一个国产种Euptelea pleiospermum Hook.f.et Thoms的染色体数目，n=14，2n=28。描述了它的胚珠结构，大小孢子的发育及胚囊的类型。 相似文献
5.
陈少风 《中国科学院研究生院学报》1989,27(1):39-48
本文研究了四川黄精属Polygonatum 8个种的染色体数目和结构，玉竹n=10，
2n=20=4st十6sm十10m； 多花黄精2n=20＝6sm十14m； 点花黄精n=16,2n＝
32=2t十8st+2sm十20m；滇黄精n=13，2n=26=8st (2SAT)+14sm+4m；互卷黄
精2n=32=6st+8sm+18m (2SAT)； 湖北黄精n=15， 2n=30=2t+6st十6sm+
16m(2SAT)；黄精2n＝24=2t十14st(2SAT)+6sm十2m；卷叶黄精n=28，2n=56=
18st+10sm十28m。
黄精属植物染色体数目和结构的变异类型多样，8种黄精的核型可以区分为3种类型：2
B、3B、2C。核型不对称性的加强与染色体数目的递增有相关性。本文就染色体方面的资料对 前人关于该属分类群的亲缘关系的论述进行了讨论。 相似文献
6.
本文对四川的窄瓣鹿药(Smilacina tatsienensis (Franch. )wang et Tang)和麦冬(Ophiopogon
japonicus(L. f.)Ker.－Gawl．)进行了核型分析和形态研究，它们的核型报道为第一次。麦冬的核型公
式为2n=2x＝36=18m(4ＳAT)+18sm，并在同株植物发现它的三倍体2n＝3x＝54(为第一次
报道)和四倍体2n＝4x＝72的体细胞，证明四川绵阳栽培的麦冬为混倍体植物。窄瓣鹿药的核型公 式为 2n=2x＝36＝16m十10sm十10st(2SAT)。 相似文献
7.
此文包括了缢花沙参Adenophora contracta (Kitag．) J． Z． Qu et Hong 和松叶沙参 A．pinifolia Kitag．两个种。在过去，前者曾被处理为石沙参的变种(A.polyantha Nakai var．contracta Kitag．)。本文通过对它的地理分布、植物体形态和细胞学特征的研究，发现它相当独特。所以，把它处理为种的等级A．contracta (Kitag．) J．Z．Qu. et Hong。后者，曾被洪德元(1983)处理为存疑种。在此被确认为独立的种。 相似文献
8.
本文对国产7种甘草属植物的核型进行了研究，其结果为：乌拉尔甘草2n＝16＝
6m+10sm；黄甘草2n＝16=8m+6sm十2st；光果甘草2n＝16=14m+2sm；胀果甘
草2n＝16＝6m十10sm；粗毛甘草2n=16=12m十4sm；云南甘草20＝16=12m十
4sm；刺果甘草2n＝16＝12m十4sm。基于对现有资料的分析，确认该属的染色体基数为
x=8， 且核型对称性程度较高。 通过对不同种核型进行比较，发现刺果甘草是本文所研究
7个种中最原始的，而黄甘草的进化程度相对较高。 相似文献
9.
文章报道了13种蜘蛛抱蛋属植物的染色体核型，并对属内核型进化规律作了总结。作者认为随体染色体和第1对染色体可以作为本属核型的特征染色体。染色体数目变异与花部式样密切相关。本属植物原始的染色体基数为x=19。此外，对非整倍性变异的主要机制也进行了讨论。 相似文献
10.
四川宝兴地区几种豆科植物的染色体 总被引：1，自引：0，他引：1
洪德元 《中国科学院研究生院学报》1984,22(4):301-305
Meiosis and/or mitosis of six species of Fabaceae (Leguminosae) from
Baoxing County, Sichuan, China, were investigated. The voucher specimens are con-
served in PE. Eight pairs (n=8) and 10 chiasmata in meiosis of pollen mother cells
have been observed in Medicago lupulina L. (Pl. 1, A-C). Meiotic observation on
pollen mother cells in Lotus tenuis W. et K. shows 6 bivalents (n=6) in MI and 9 chias-
mata in diakinesis (Pl. 1, D-E). In this species 12 somatic chromosomes (2n=12) in
anther wall cells have also been observed. The chromosomal formula may be expressed
as 2n=12=8m+2sm+2smSAT (Pl. 1, F-G). In pollen mother cells of Vicia tetrasperma
(L.) Schreb., 7 bivalents in MI and 7 chromosomes in A II have been observed (Pl. 2,
A-B). From A II (Pl. 2, B, the inset on the right) the chromosomal formula, n=7=
2m+2sm+lstSAT+2t, may be constructed. Only three chromosomes in this karyotype may
be found to have counterparts in the one reported by Srivastava (1963), which shows
striking differences between these two karyotypes. Meiotic MI shows 7 pairs (n=7)
in Vicia hirsuta (L.) S. F. Gray. Vicia sativa L. is very variable in its chromosomes.
Our observation shows 6 pairs (n=6) in MI and in diakinesis in pollen mother cells.
In Vicia villosa Roth, all the previous chromosome reports are 2n=14 or n=7, but the
result of our work shows that somatic chromosomes are 2n=12 in anther wall cells
(Pl. 3, D, E). The karyotype in our material (Pl. 3, E) is that the longest pair of chro-
mosomes are metacentric, the pairs 2-4 are terminal, 5 are metacentric and last pair
are submetacentric, differing vastly from the idiogram (Pl. 3, F) presented by Yama-
moto (1973). Therefore both the chromosome number and structure in our material
are greatly different from those in all the previous reports.
The evolutionary trends of chromosomes in the genus Vicia is discussed in the
work. Srivastava (1963) holds that the primitive basic number of chromosome in the
genus is 6 and thus both 5 and 7 are derived. The present author would propose ano-
ther possibility that 7 is the original basic number and the other numbers are derived
ones. First, as shown in Table 1, x=7 occurs in 47 per cent of species in the genus,
but 6 only in 28 per cent. Secondly, x=7 is predominant in the perennial and primitive
section Cracca. Thirdly, in genera related to the genus under consideration, such as
Lens, Pisum and Lathyrus, x=7 is also the predominant basic number. Fourthly, ac-
cording to Raven (1975) 7 is the primitive basic number in the angiosperms and x=
7, 8 and 9 are the predominant in the angiosperms. 相似文献