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Karyomorphological Studies in Three Species of Alocasia (Schott.) G.Don.- an Ethno-Medicinally and Economically Important Genus

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Karyomorphological Studies in Three Species of Alocasia (Schott.) G.Don.- an Ethno-Medicinally and Economically Important Genus Int. J. Life. Sci. Scienti. Res. eISSN: 2455-1716 Das, 2018 DOI:10.21276/ijlssr.2018.4.6.8 Research Article Karyomorphological Studies in Three Species of Alocasia (Schott.) G.Don.- An Ethno-medicinally and Economically Important Genus Bandana Nabis Das * Associate Professor, Department of Botany, Handique Girls’ College, Guwahati, Assam, India *Address for Correspondence Dr. Bandana Nabis Das, Associate Professor, Department of Botany, Handique Girls’ College, Guwahati, Assam, India Received: 08 Apr 2018/ Revised: 05 Jul 2018/ Accepted: 29 Oct 2018 ABSTRACT Karyomorphological studies in Alocasia macrorrhiza (L.) G.Don., Alocasia fornicate (Roxb.) Schott, Alocasia longiloba Miq. belonging to the family Araceae using root tip squash technique was carried out. It was observed that the chromosome number for the three species was found to be 2n=28 and chromosomes are smaller in size. The chromosomes in Alocasia longiloba were found to be longer in length in comparison to Alocasia macrorrhiza, Alocasia fornicata. Present studies also reveal that the karyotype is a symmetric type. The present karyomorphological study has been undertaken as it is an established fact that karyomorphological analysis forms a prerequisite for the genetic improvement of any plant species. This study would be helpful in the protection, conservations of the species by establishment of germplasm bank. Key-words Alocasia macrorrhiza, Karyomorphology, Karyotypes, Symmetric type, Chromosomes INTRODUCTION The genus Alocasia (Schott) G. Don belongs to the family Boiled stems of A. macrorrhizos are used as a laxative, Araceae consisting of about 2,500 species [1] . There are chopped-up roots and leaves as a rubefacient, and juice 79 species native to tropical and sub-tropical Asia to from the petiole against a cough. The plants are applied Eastern Australia and wildly cultivated elsewhere [2] . The for stimulating the skin, e.g. in cases of fever and to species of this genus have been distributed in the remove blotches. The rhizome is sometimes used as a Northeast and South India, Sri Lanka, and Bangladesh [3] . poultice to treat furuncles. The pounded stems are These are generally grown in marshy lands, but applied as a paste to snakebites and scorpion stings. sometimes also in shady damp places in the forest and in Alocasia fornicata (Roxb.) Schott is important as food village thickets. In this study, three species of Alocasia and ethno-medicine in Asia and Africa since time (Schott) G.Don, A. macrorrhiza (L.) G.Don , A. fornicate immemorial. In India, many people have been using (Roxb.) Schott , A. longiloba Miq. were selected. These rhizome paste to treat wounds, cure heel cracks and kill species are ethno-medicinally and economically worms in domestic animals. A number of chemicals could important plants. According to IUCN Red list Alocasia be isolated from this species. The antioxidant properties atropurpurea and Alocasia sanderiana are tagged as of the edible parts of different plants have already been Critically Endangered [4] . Several medicinal applications established [5] . There is growing industrial interest of Alocasia have been reported for South-East Asia. towards the production of herbal antioxidants that can be supplemented in medicine, cosmetics, and How to cite this article Das BN. Karyomorphological Studies in Three Species of Alocasia nutraceuticals in the modern world. (Schott.) G.Don.-An Ethno-medicinally and Economically Important The tissues of Alocasia contain calcium oxalate crystals, Genus. Int. J. Life. Sci. Scienti. Res., 2018; 4(6): 2116-2121. which produce irritation of the skin and inflammations of the oral cavity and mucous membranes. Sapotoxin is also present, and the toxic effects include gastroenteritis and Access this article online www.ijlssr.com paralysis of the nerve centres. Hydrocyanic acid is often present. The poisonous substances can be removed by repeated cooking, but the rhizomes and bases of petioles Copyright © 2015 - 2018| IJLSSR by Society for Scientific Research under a CC BY-NC 4.0 International License Volume 04 | Issue 06 | Page 2116 Int. J. Life. Sci. Scienti. Res. eISSN: 2455-1716 Das, 2018 DOI:10.21276/ijlssr.2018.4.6.8 of A. macrorrhizos which are sometimes used for food For the preparation of slides the root tips were first usually contain few poisonous substances. A lectin has hydrolysed with 1N HCl and stained with aceto orecin been isolated from the rhizome of A. macrorrhizos , and warmed over flame for 10 to 15 minutes and kept which showed potent mitogenic activity on human for 2 - 3 hours at room temperature. Single root tip was peripheral blood lymphocytes in the [3H]-thymidine taken in a drop of 45% acetic acid on a slide. Only the uptake assay. It was a T-cell mitogen and did not induce dividing tip region was taken discarding the other tissue. any appreciable DNA synthesis in B-enriched Cover slip was placed over the tip and squashed by lymphocytes. This species also contains a protein which applying uniform pressure with the thumb through a inhibits both the enzymes trypsin and chymotrypsin. The piece of blotting paper, a gentle tapping followed by seed extract showed antifungal activity. There is also a heat fixing and finally sealed with paraffin for further report on HIV-1 protease inhibitory activity [6]. studies [8,9] . Alocasia is a plant of great economic value. The temporary slides thus prepared were observed Experimentally antimicrobial, antifungal, antioxidant, under compound microscope at a magnification of 1000 x hepato-protective, anti-diarrheal, anti-protozoal, using oil immersion (10×100 x, oil immersion). This anticancer properties have been found in many species procedure was standardized through trial and error of Alocasia . As such it needs conservation and detailed method. Metaphase plates were selected for chromosome studies would aid in creating germplasm [7] . karyomorphological analysis of the chromosomes. Perfectly stained chromosomes were photographed Hence, the present study has been undertaken: using Trinocular microscope-N400-M, CMOS camera 5M To conduct karyomorphological studies in three species with image analysis system. The drawings of the of Alocasia (Schott) G.Don: chromosomes were made with the help of camera lucida o Alocasia macrorrhizos (L.) G.Don apparatus. Idiograms were then constructed on tracing o Alocasia fornicate (Roxb.) Schott paper. o Alocasia longiloba Miq. Following parameters of the chromosomes were MATERIALS AND METHODS considered: In the present investigation three species of Alocasia i) Length of the long arm (Schott) G.Don were collected from different localities of ii) Length of the short arm Greater Guwahati. The saplings were potted inside the iii) Total length of the chromosome institute campus for collection of fresh roots for the iv) Volume of the chromosome experiment. The following investigation proceeded for 5 v) Relative length months i.e. from January to May 2017. vi) Centromeric position Cytological investigation- For chromosome On the basis of the length, the chromosomes lengths characterization in A. macrorrhiza, A. fornicata and A. were categorized under the following types- longiloba detailed karyotypic studies were undertaken. Karyotypes were prepared from the somatic Type A= 3.00 µm and above chromosomes. For cytological studies, root tips squash Type B= 2.50 µm - 2.90 µm technique is done. Very young root tips were collected Type C= 2.00 µm - 2.49 µm from the plant between 7:45 AM - 8:15 AM washed in Type D= 1.00 µm - 1.90 µm double distilled water and pre-treated with saturated Type E= 0.01 µm - 0.99 µm solution of Para dichlorobenzene at a suitable temperature for 3 hours at 4°C±2°C. Pretreated young The volume of an individual chromosome was calculated root tips are fixed in a suitable fixative such as Carnoy’s as chromosome volume- 2 fluid-2 (1:3:6; Glacial acetic acid: Chloroform: Ethanol) (V) = πr h for 24 to 28 hours at room temperature. After fixation Where, r= Radius of the chromosome; h= Length of the the root tips were thoroughly washed with 70% ethanol whole chromosome. and finally they were stored used for cytological work. Copyright © 2015 - 2018| IJLSSR by Society for Scientific Research under a CC BY-NC 4.0 International License Volume 04 | Issue 06 | Page 2117 Int. J. Life. Sci. Scienti. Res. eISSN: 2455-1716 Das, 2018 DOI:10.21276/ijlssr.2018.4.6.8 The total chromosome volume was then expressed by classified into metacentric, sub-metacentric, sub- adding the volumes of all the chromosomes. On the basis telocentric, and telocentric following the nomenclature of centromere position, the chromosomes were system of Levan et al . [10]. Fig. 1 (a-d): Karyotype and Ideogram of somatic chromosomes of Alocasia macrorrhiza (L) G.Don Fig 2 (a-d): Karyotype and Ideogram of somatic chromosome of Alocasia fornicate (Roxb.) Schott. Copyright © 2015 - 2018| IJLSSR by Society for Scientific Research under a CC BY-NC 4.0 International License Volume 04 | Issue 06 | Page 2118 Int. J. Life. Sci. Scienti. Res. eISSN: 2455-1716 Das, 2018 DOI:10.21276/ijlssr.2018.4.6.8 Fig 3 (a-d): Karyotype and Idiogram of somatic chromosomes of Alocasia longiloba Miq . RESULTS Cytological and karyotypic investigation in A. macrorrhiza chromosomes belongs to type B. So the Chromosome (L) G.Don, A. fornicata (Roxb.) Schott. and A. longiloba formula can be written as: A 15 +B 13 +C 0+D 0+E 0= 2n= 28, showed that all the three species consist of 2n=28 is the and the karyotypic formula can be written as: M10+ chromosome (Table 1). On the basis of length of Sm18= 28. However, A. longiloba Miq. 20 chromosomes chromosomes, it was observed that in A. macrorrhiza 10 belongs to type A and 8 chromosomes belongs to type B, chromosomes belongs to type A and 18 chromosomes therefore their chromosomes formula can be written as: belongs to type B and the chromosomes formula can be A20 +B 8+ C 0+ D 0+E 0= 2n= 28 and the karyotypic formula written as: A 10 + B 18 + C 0+D 0+ E 0= 2n= 28.
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