Meiotic behaviour and its implication on species inter-relationship in the genus Curcuma (Linnaeus, 1753) (Zingiberaceae)

In this paper, detailed meiotic analysis was investigated in seven species of Curcuma (Linnaeus, 1753) which can contribute significantly to our understanding about species inter-relationship, speciation and evolution. The species were divided into two groups viz., Group I having 2...

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Main Authors: Judith Mary Lamo, Satyawada Rama Rao
Format: Article
Language:English
Published: Pensoft Publishers 2017-10-01
Series:Comparative Cytogenetics
Online Access:https://compcytogen.pensoft.net/articles.php?id=14726
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spelling doaj-0f61fb77029545b2969c8de192d0f87f2020-11-24T22:01:38ZengPensoft PublishersComparative Cytogenetics1993-07711993-078X2017-10-0111469170210.3897/compcytogen.v11i4.1472614726Meiotic behaviour and its implication on species inter-relationship in the genus Curcuma (Linnaeus, 1753) (Zingiberaceae)Judith Mary Lamo0Satyawada Rama Rao1North-Eastern Hill UniversityNorth-Eastern Hill University In this paper, detailed meiotic analysis was investigated in seven species of Curcuma (Linnaeus, 1753) which can contribute significantly to our understanding about species inter-relationship, speciation and evolution. The species were divided into two groups viz., Group I having 2n = 42 (C. comosa Roxburgh, 1810, C. haritha Mangaly & M.Sabu, 1993, C. mangga Valeton & Zijp, 1917, and C. motana Roxburgh, 1800) and Group II with 2n = 63 (C. caesia Roxburgh, 1810, C. longa Linnaeus, 1753 and C. sylvatica Valeton, 1918). Both groups display varying degree of chromosome associations. Group I species showed the prevalence of bivalents, however occasional quadrivalents besides univalents were also encountered. About 48% of the PMCs analyzed in C. mangga showed 21 bivalents (II) meiotic configurations, 32% in C. comosa and 16% in C. haritha. Group II species as expected showed the presence of trivalents besides bivalents, univalents and quadrivalents. About 32% of the PMCs analyzed at MI in C. sylvatica showed 21 trivalents (III) meiotic configurations, 24% in C. longa and 8% in C. caesia. Overall, low frequency of multivalent associations as compared to bivalents indicates that Curcuma is an allopolyploid complex. Moreover, x = 21 is too high a basic number, therefore, we suggest that the genus Curcuma has evolved by hybridization of species with different chromosome numbers of 2n = 24 and 18, resulting in a dibasic amphidiploid species. https://compcytogen.pensoft.net/articles.php?id=14726
collection DOAJ
language English
format Article
sources DOAJ
author Judith Mary Lamo
Satyawada Rama Rao
spellingShingle Judith Mary Lamo
Satyawada Rama Rao
Meiotic behaviour and its implication on species inter-relationship in the genus Curcuma (Linnaeus, 1753) (Zingiberaceae)
Comparative Cytogenetics
author_facet Judith Mary Lamo
Satyawada Rama Rao
author_sort Judith Mary Lamo
title Meiotic behaviour and its implication on species inter-relationship in the genus Curcuma (Linnaeus, 1753) (Zingiberaceae)
title_short Meiotic behaviour and its implication on species inter-relationship in the genus Curcuma (Linnaeus, 1753) (Zingiberaceae)
title_full Meiotic behaviour and its implication on species inter-relationship in the genus Curcuma (Linnaeus, 1753) (Zingiberaceae)
title_fullStr Meiotic behaviour and its implication on species inter-relationship in the genus Curcuma (Linnaeus, 1753) (Zingiberaceae)
title_full_unstemmed Meiotic behaviour and its implication on species inter-relationship in the genus Curcuma (Linnaeus, 1753) (Zingiberaceae)
title_sort meiotic behaviour and its implication on species inter-relationship in the genus curcuma (linnaeus, 1753) (zingiberaceae)
publisher Pensoft Publishers
series Comparative Cytogenetics
issn 1993-0771
1993-078X
publishDate 2017-10-01
description In this paper, detailed meiotic analysis was investigated in seven species of Curcuma (Linnaeus, 1753) which can contribute significantly to our understanding about species inter-relationship, speciation and evolution. The species were divided into two groups viz., Group I having 2n = 42 (C. comosa Roxburgh, 1810, C. haritha Mangaly & M.Sabu, 1993, C. mangga Valeton & Zijp, 1917, and C. motana Roxburgh, 1800) and Group II with 2n = 63 (C. caesia Roxburgh, 1810, C. longa Linnaeus, 1753 and C. sylvatica Valeton, 1918). Both groups display varying degree of chromosome associations. Group I species showed the prevalence of bivalents, however occasional quadrivalents besides univalents were also encountered. About 48% of the PMCs analyzed in C. mangga showed 21 bivalents (II) meiotic configurations, 32% in C. comosa and 16% in C. haritha. Group II species as expected showed the presence of trivalents besides bivalents, univalents and quadrivalents. About 32% of the PMCs analyzed at MI in C. sylvatica showed 21 trivalents (III) meiotic configurations, 24% in C. longa and 8% in C. caesia. Overall, low frequency of multivalent associations as compared to bivalents indicates that Curcuma is an allopolyploid complex. Moreover, x = 21 is too high a basic number, therefore, we suggest that the genus Curcuma has evolved by hybridization of species with different chromosome numbers of 2n = 24 and 18, resulting in a dibasic amphidiploid species.
url https://compcytogen.pensoft.net/articles.php?id=14726
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