New cytotaxonomical determinants recognized in six taxa of Agave in the sections Rigidae and Sisalanae

1991 ◽  
Vol 69 (6) ◽  
pp. 1257-1264 ◽  
Author(s):  
I. Castorena-Sánchez ◽  
R. M. Escobedo ◽  
A. Quiroz
Keyword(s):  
Key Words ◽  
Karyotype Analysis ◽  
Point Mutations ◽  
Agave Tequilana ◽  
Speciation Process ◽  
Agave Angustifolia ◽  
Agave Fourcroydes ◽  
Intersectional Hybrid ◽  
Agave Sisalana

New cytotaxonomical determinants are presented for the following taxa of Agave: (I) section Rigidae: Agave fourcroydes Lemaire (5x = 150), first karyotype; Agave angustifolia Haworth (sensu Gentry), new count (6x = 180), first karyotype; Agave angustifolia Haworth var. marginata Hort. (2x = 60); and Agave tequilana Weber, new count (2x = 60), first karyotype; (II) section Sisalanae: Agave sisalana Perrine (5x = 150), first karyotype; and (III) intersectional hybrid: Agave hybrid 11 648 new count (2x = 60), first karyotype. Chromosomes are classified and arm number, chromatin length, and variability are discussed. These results suggest (i) a speciation process via limited rearrangements and point mutations in the small chromosomes of the complement, within the euploidy level rather than karyotype diversification and (ii) a reconsideration to assign them to the 2C level of Stebbins karyotype classification. Key words: fiber agaves, karyotype analysis.

scholarly journals Meiotic restitution mechanisms involved in the formation of 2n pollen in Agave tequilana Weber and Agave angustifolia Haw

SpringerPlus ◽  
2012 ◽  
Vol 1 (1) ◽  
pp. 17 ◽  
Author(s):  
Víctor Gómez-Rodríguez ◽  
Benjamín Rodríguez-Garay ◽  
Rodrigo Barba-Gonzalez
Keyword(s):  
Agave Tequilana ◽  
2N Pollen ◽  
Meiotic Restitution ◽  
Agave Angustifolia

Morphological and molecular diversity of Agave tequilana Weber var. Azul and Agave angustifolia Haw. var. Lineño

2009 ◽  
Vol 29 (1) ◽  
pp. 220-228 ◽  
Author(s):  
B. Rodríguez-Garay ◽  
J.A. Lomelí-Sención ◽  
E. Tapia-Campos ◽  
A. Gutiérrez-Mora ◽  
J. García-Galindo ◽  
...  
Keyword(s):  
Molecular Diversity ◽  
Agave Tequilana ◽  
Agave Angustifolia

scholarly journals Karyotype analysis with orcein and CMA in two species of Alocasia (Schott) G. Don (Araceae)

1970 ◽  
Vol 40 (1) ◽  
pp. 53-56 ◽  
Author(s):  
Syeda Sharmeen Sultana ◽  
Hosne Ara ◽  
Sheikh Shamimul Alam
Keyword(s):  
Chromosome Number ◽  
Key Words ◽  
Karyotype Analysis ◽  
Chromosome Complement ◽  
Taxonomic Status ◽  
The Other ◽  
First Report ◽  
Total Length ◽  
Internet Information ◽  
Chromosomal Length

Alocasia fallax Schott and A. odora (Roxb.) Koch (Araceae) were investigated cytogenetically to confirm their taxonomic status. There is no report of 2n chromosome number for A. fallax in the available literature and internet information. Therefore the 2n chromosome number (2n = 28) found in this study is probably the first report for A. fallax. Alocasia odora showed exactly double 2n chromosome number (2n = 56) from A. fallax. In addition to chromosome number, the other karyotypic features of A. odora were exactly double for that of A. fallax. The centromeric formulae of A. fallax was 24 m + 4 sm whereas it is just double in A. odora. Total length of 2n chromosome complement of A. odora (62.58 μm) was almost double to A. fallax. The range of chromosomal length of the two species was almost same. Moreover, A. odora plant is much taller than A. fallax. All of these data suggests that A. odora might be an autotetraploid of A. fallax which in course of evolution had undergone some changes in GC-rich repeats. Key words: Alocasia; CMA; Karyotype analysis DOI: http://dx.doi.org/10.3329/bjb.v40i1.7998 Bangladesh J. Bot. 40(1): 53-56, 2011 (June)

scholarly journals Karyotype analysis with orcein and CMA from leaf base cells of Rauvolfia serpentina Benth. et Kurz

1970 ◽  
Vol 38 (1) ◽  
pp. 111-113 ◽  
Author(s):  
Syeda Sharmeen Sultana ◽  
ANM Rubaiyath Bin Rahman ◽  
Sheikh Shamimul Alam
Keyword(s):  
Key Words ◽  
Karyotype Analysis ◽  
Chromosome Length ◽  
Entire Length ◽  
Leaf Base ◽  
Interphase Nuclei ◽  
Rich Region ◽  
Rauvolfia Serpentina ◽  
Fluorescent Banding ◽  
Orcein Staining

Many prominent darkly stained heterochromatic blocks were found in the interphase nuclei of Rauvolfia serpentina following orcein staining. The prophase chromosomes of this species became stained homogeneously throughout the entire length. This species was found to possess 2n = 20 metacentric chromosomes revealing symmetric karyotype but if the chromosome length (6.67 - 3.17 μm) is considered, it indicates asymmetric karyotype. Total GC-rich region was 15.62% of the total chromatin length. Eight CMA-positive bands on different locus revealed the accumulation of GC-rich repeats. The two entirely CMA-banded chromosomes were so unique that could be used as marker for this species. Key words: Karyotype; Rauvolfia serpentina; Fluorescent banding DOI: 10.3329/bjb.v38i1.5133 Bangladesh J. Bot. 38(1): 55-63, 2009 (June)

scholarly journals Caracterización fisicoquímica de cuatro especies de agaves con potencialidad en la obtención de pulpa de celulosa para elaboración de papel

DYNA ◽  
2016 ◽  
Vol 83 (197) ◽  
pp. 232 ◽  
Author(s):  
Edith Jiménez Muñoz ◽  
Francisco Prieto-García ◽  
Judith Prieto Méndez ◽  
Otilio Arturo Acevedo Sandoval ◽  
Rodrigo Rodríguez Laguna
Keyword(s):  
Agave Tequilana ◽  
Agave Angustifolia ◽  
Agave Salmiana

<p>El objetivo general de este trabajo fue encontrar un nuevo valor agregado a las hojas de las agaváceas, desecho de la agroindustria. Se estudiaron cuatro especies de agaves de tres estados de la república mexicana: Agave angustifolia (Oacaxa), Agave tequilana (Jalisco), Agave salmiana y Agave lechuguilla (Hidalgo). Luego de una clasificación taxonómica, fenológica, ecológica y etnobotánica (basados en morfología comparada), se sometieron a diversos análisis físicos (humedad, molienda, tamizaje, granulometría y características foliares, MEB) y químicos (cenizas grasas y aceites, proteínas, análisis TGA y DTGA, así como FTIR). Las especies de A. angustifolia y A. tequilana son las que presentan un óptimo tamaño de fibra para la elaboración de papel. Corresponde también a los mayores porcentajes de celulosa (44.3% y 36.8%) por DTGA. Del análisis proximal, se evidencia que las dos especies definidas como mejores para la obtención de pulpa de celulosa, presentan pequeñas diferencias significativas en contenidos de grasas, proteínas, material solubilizable en agua caliente (AT) como en solución moderadamente alcalina y/o alcohólica.</p>

scholarly journals Primer registro de Agave sisalana (Agavaceae, Asparagales) para Colombia

2020 ◽  
Vol 8 (2) ◽  
pp. 490-498
Author(s):  
Diego Giraldo-Cañas
Keyword(s):  
South America ◽  
Native Species ◽  
Yucatan Peninsula ◽  
South American ◽  
The South ◽  
South American Species ◽  
Reproductive Characteristics ◽  
Agave Fourcroydes ◽  
First Time ◽  
Agave Sisalana

Agave sisalana Perrine, a native species from Yucatán Peninsula (Mexico), is recorded for the first time for Colombia. It is morphologically related to Agave fourcroydes Lem. and Agave pax Giraldo-Cañas, but clearly differs from it in various vegetative and reproductive characteristics, which are given. Thus, a total of ten species of Agave are currently known in South America, seven are native and three are naturalized. A key for the South American species is included.

scholarly journals Karyotypic Study of seven Types of Impatiens balsamina L.

1970 ◽  
Vol 15 ◽  
pp. 147-152 ◽  
Author(s):  
USN Momtaz ◽  
G Kabir ◽  
MM Ud-deen ◽  
N Yasmin
Keyword(s):  
Chromosome Number ◽  
Key Words ◽  
Secondary Constriction ◽  
Karyotype Analysis ◽  
Diploid Chromosome Number ◽  
Interphase Chromosome ◽  
Karyotypic Analysis ◽  
Total Frequency ◽  
Impatiens Balsamina ◽  
Karyotypic Study

Nuclear phenotype and chromosome characteristics of eight types of Impatiens balsamina L. were studied. The diploid chromosome number was found to be 2n=14 in all types of Impatiens balsamina. Interphase chromosome volume was found to range from 0.1665μ3 (violet type) to 0.3904 μ3 (red type). The maximum total chromatin length (24.73μm) was observed in pink type and minimum (11.70μm) in violet type. Maximum total frequency percent (50.00%) was found in both foreign types (red and violet) and minimum (48.03%) in violet type. The karyotype analysis revealed that there was no secondary constriction and sub-terminal chromosome in any of the seven types belonging to Impatiens balsamina. So, on the basis of karyotypic analysis the present findings indicated that all the types of Impatiens balsamina were of primitive nature. Key words: Karyotype, Nuclear phenotype, Impatiens balsamina L.   doi: 10.3329/jbs.v15i0.2155    J. bio-sci. 15: 147-152, 2007

Reproductive biology of henequén (Agave fourcroydes ) and its wild ancestor Agave Angustifolia (Agavaceae). i. Gametophyte development

2001 ◽  
Vol 88 (11) ◽  
pp. 1966-1976 ◽  
Author(s):  
Nickolai M. Piven ◽  
Felipe A. Barredo-Pool ◽  
Ileana C. Borges-Argáez ◽  
Miguel A. Herrera-Alamillo ◽  
Alberto Mayo-Mosqueda ◽  
...  
Keyword(s):  
Reproductive Biology ◽  
Gametophyte Development ◽  
Wild Ancestor ◽  
Agave Angustifolia ◽  
Agave Fourcroydes

scholarly journals Quantitative karyotype analysis of Agave americana L. and A striata Zucc

1970 ◽  
Vol 39 (2) ◽  
pp. 229-235
Author(s):  
Serajum Munira ◽  
Md Mosleh Ud-Deen ◽  
Golam Kabir
Keyword(s):  
Key Words ◽  
Karyotype Analysis ◽  
Chromosome Length ◽  
Individual Chromosome ◽  
Total Frequency ◽  
Agave Americana ◽  
Standard Karyotype

Karyotype analysis of Agave americana L. and A. striata Zucc revealed that both the species had 2n = 60 with differences in individual chromosome length, total chromatin length (TCL) and total frequency % (TF%) between the complements of their chromosomes. The identified chromosome pairs were Im, IISm, IIISm, IVSm, Vm, VISm, VIIISt, IXSm, XIISm, XVIISm, XVIIISm, XIXm, XXIm, XXIIm, XXIIIm, XXIVSt, XXVm, XXVISm, XXVIISm, XXIXSm and XXXm in A. americana and IIm, IIISt, IVSm, VIsm, VIISt, VIIISm, IXSm, XIIm, XIIISt, XIVSm, XVSm, XVISm, XVIISm, XIVSm, XXm, XXISm, XXIIISm, XXVm, XXVIISm and XXVIIIm in A. striata. The proposed standard karyotype were 1L1m + 9M8Sm+1St + 16S18m+7Sm+1St + 4S22Sm+1St for A. americana and 2L1m+1Sm + 9M7Sm+2St + 15S1 3m+11Sm+1St + 4S2 2m+2Sm for A. striata. Key words: Karyotype analysis; Agave americana; A. striata DOI: 10.3329/bjb.v39i2.7485 Bangladesh J. Bot. 39(2): 229-235, 2010 (December)

Karyological studies in some taxa of the genus Artemisia (Asteraceae)

1994 ◽  
Vol 72 (8) ◽  
pp. 1126-1135 ◽  
Author(s):  
Marian Oliva Brañas ◽  
Joan Vallès Xirau
Keyword(s):  
Chromosome Number ◽  
Key Words ◽  
Karyotype Analysis ◽  
Chromosome Morphology ◽  
Morphology Evolution ◽  
Karyological Study ◽  
Geographic Origins ◽  
Different Populations ◽  
Basic Numbers ◽  
Diploid Populations

A karyological study of six taxa (eight populations) of the genus Artemisia L. from different geographic origins is presented. The work deals with chromosome number and morphometry. We found the two usual basic numbers in the genus: x = 9, the most common one (in two diploid, two hypotetraploid, one tetraploid and one hexaploid populations) and x = 8 (in two diploid populations). Detailed karyotype analysis allows us to group the different populations and to postulate relationships among them. Key words: Asteraceae, Anthemideae, Artemisia, cytotaxonomy, chromosome morphology, evolution.

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