Asynapsis in cassava
A completely male sterile clone was identified in the germplasm and detailed meiosis showed it to be asynaptic. At pachytene all the chromosomes remained as univalents without any semblance to pairing. MI aslo showed 36 univalents in 97% of pollen mother cells. The bivalent like association in MI wa...
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| Veröffentlicht in: | CYTOLOGIA 1984/06/25, Vol.49(2), pp.273-277 |
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| container_title | CYTOLOGIA |
| container_volume | 49 |
| creator | Jos, J.S Vijaya Bai, K Nair, R.B |
| description | A completely male sterile clone was identified in the germplasm and detailed meiosis showed it to be asynaptic. At pachytene all the chromosomes remained as univalents without any semblance to pairing. MI aslo showed 36 univalents in 97% of pollen mother cells. The bivalent like association in MI was as low as 0.03 per cell but the absence of pairing at pachytene and the lack of well defined x'mata suggested that they were only univalents lying closely together due to factors other than true pairing. The later stages were not well defined and univalents were noticed to divide. The scattering of chromosomes and irregular groupings resulted in polyads consequently all the pollen were sterile. The type of asynapsis noticed was ‘complete’. The presence of pollen sterility in all the plants of Ce-258 throughout the season ruled out environmental factors and suggested it was of genic nature. |
| doi_str_mv | 10.1508/cytologia.49.273 |
| format | Article |
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At pachytene all the chromosomes remained as univalents without any semblance to pairing. MI aslo showed 36 univalents in 97% of pollen mother cells. The bivalent like association in MI was as low as 0.03 per cell but the absence of pairing at pachytene and the lack of well defined x'mata suggested that they were only univalents lying closely together due to factors other than true pairing. The later stages were not well defined and univalents were noticed to divide. The scattering of chromosomes and irregular groupings resulted in polyads consequently all the pollen were sterile. The type of asynapsis noticed was ‘complete’. The presence of pollen sterility in all the plants of Ce-258 throughout the season ruled out environmental factors and suggested it was of genic nature.</description><identifier>ISSN: 0011-4545</identifier><identifier>EISSN: 1348-7019</identifier><identifier>DOI: 10.1508/cytologia.49.273</identifier><identifier>CODEN: CYTOAN</identifier><language>eng</language><publisher>Tokyo: Japan Mendel Society, International Society of Cytology</publisher><subject>Agronomy. Soil science and plant productions ; asynapsis ; Biological and medical sciences ; chromosome number ; chromosome pairing ; Cytogenetics ; Fundamental and applied biological sciences. Psychology ; Generalities. Genetics. Plant material ; Genetics and breeding of economic plants ; Genetics of eukaryotes. Biological and molecular evolution ; male sterility ; Manihot esculenta ; meiosis ; Pteridophyta, spermatophyta ; Vegetals and fungi</subject><ispartof>CYTOLOGIA, 1984/06/25, Vol.49(2), pp.273-277</ispartof><rights>The Japan Mendel Society</rights><rights>1985 INIST-CNRS</rights><rights>Copyright Japan Science and Technology Agency 1984</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,1881,27923,27924</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=9039182$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Jos, J.S</creatorcontrib><creatorcontrib>Vijaya Bai, K</creatorcontrib><creatorcontrib>Nair, R.B</creatorcontrib><title>Asynapsis in cassava</title><title>CYTOLOGIA</title><description>A completely male sterile clone was identified in the germplasm and detailed meiosis showed it to be asynaptic. At pachytene all the chromosomes remained as univalents without any semblance to pairing. MI aslo showed 36 univalents in 97% of pollen mother cells. The bivalent like association in MI was as low as 0.03 per cell but the absence of pairing at pachytene and the lack of well defined x'mata suggested that they were only univalents lying closely together due to factors other than true pairing. The later stages were not well defined and univalents were noticed to divide. The scattering of chromosomes and irregular groupings resulted in polyads consequently all the pollen were sterile. The type of asynapsis noticed was ‘complete’. The presence of pollen sterility in all the plants of Ce-258 throughout the season ruled out environmental factors and suggested it was of genic nature.</description><subject>Agronomy. Soil science and plant productions</subject><subject>asynapsis</subject><subject>Biological and medical sciences</subject><subject>chromosome number</subject><subject>chromosome pairing</subject><subject>Cytogenetics</subject><subject>Fundamental and applied biological sciences. Psychology</subject><subject>Generalities. Genetics. Plant material</subject><subject>Genetics and breeding of economic plants</subject><subject>Genetics of eukaryotes. Biological and molecular evolution</subject><subject>male sterility</subject><subject>Manihot esculenta</subject><subject>meiosis</subject><subject>Pteridophyta, spermatophyta</subject><subject>Vegetals and fungi</subject><issn>0011-4545</issn><issn>1348-7019</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1984</creationdate><recordtype>article</recordtype><recordid>eNpdkE1PwkAQhjdGExG9efAmicZbcfar7R4N8YOExINy3gzLFktKizvFhH_vYgkkXnYO-8zzzgxjNxyGXEP-6LZtUzWLEofKDEUmT1iPS5UnGXBzynoAnCdKK33OLoiWACJVSvXY9RNta1xTSYOyHjgkwh-8ZGcFVuSv9rXPpi_Pn6O3ZPL-Oh49TRKnc9kmGkAXymgHiHPpvMpQQVGouTMpasNjSCZn0s3SPFMYycynRgtjnBCSg5J99tB516H53nhq7aok56sKa99syHIljAKACN79A5fNJtRxtsikIk8FlzsKOsqFhij4wq5DucKwtRzs7kj2cCSrjI3DxZb7vRjJYVUErF1Jhz4D0vBcRGzcYUtqceEP_xja0lX-6OVGmD9398SII_OFwfo6um47V4GNxUWIcdMPAXGBuEoO2shf6mWJlw</recordid><startdate>19840101</startdate><enddate>19840101</enddate><creator>Jos, J.S</creator><creator>Vijaya Bai, K</creator><creator>Nair, R.B</creator><general>Japan Mendel Society, International Society of Cytology</general><general>Japan Mendel Society</general><general>Japan Science and Technology Agency</general><scope>FBQ</scope><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7QL</scope><scope>7QP</scope><scope>7TK</scope><scope>7TM</scope><scope>8FD</scope><scope>C1K</scope><scope>FR3</scope><scope>M7N</scope><scope>P64</scope><scope>RC3</scope><scope>7QO</scope></search><sort><creationdate>19840101</creationdate><title>Asynapsis in cassava</title><author>Jos, J.S ; Vijaya Bai, K ; Nair, R.B</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c583t-5005f495c0aad3ce47a40ff4dc96a59100273b3cb6874af497e695299c2231043</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1984</creationdate><topic>Agronomy. Soil science and plant productions</topic><topic>asynapsis</topic><topic>Biological and medical sciences</topic><topic>chromosome number</topic><topic>chromosome pairing</topic><topic>Cytogenetics</topic><topic>Fundamental and applied biological sciences. Psychology</topic><topic>Generalities. Genetics. Plant material</topic><topic>Genetics and breeding of economic plants</topic><topic>Genetics of eukaryotes. Biological and molecular evolution</topic><topic>male sterility</topic><topic>Manihot esculenta</topic><topic>meiosis</topic><topic>Pteridophyta, spermatophyta</topic><topic>Vegetals and fungi</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Jos, J.S</creatorcontrib><creatorcontrib>Vijaya Bai, K</creatorcontrib><creatorcontrib>Nair, R.B</creatorcontrib><collection>AGRIS</collection><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Bacteriology Abstracts (Microbiology B)</collection><collection>Calcium & Calcified Tissue Abstracts</collection><collection>Neurosciences Abstracts</collection><collection>Nucleic Acids Abstracts</collection><collection>Technology Research Database</collection><collection>Environmental Sciences and Pollution Management</collection><collection>Engineering Research Database</collection><collection>Algology Mycology and Protozoology Abstracts (Microbiology C)</collection><collection>Biotechnology and BioEngineering Abstracts</collection><collection>Genetics Abstracts</collection><collection>Biotechnology Research Abstracts</collection><jtitle>CYTOLOGIA</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Jos, J.S</au><au>Vijaya Bai, K</au><au>Nair, R.B</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Asynapsis in cassava</atitle><jtitle>CYTOLOGIA</jtitle><date>1984-01-01</date><risdate>1984</risdate><volume>49</volume><issue>2</issue><spage>273</spage><epage>277</epage><pages>273-277</pages><issn>0011-4545</issn><eissn>1348-7019</eissn><coden>CYTOAN</coden><abstract>A completely male sterile clone was identified in the germplasm and detailed meiosis showed it to be asynaptic. At pachytene all the chromosomes remained as univalents without any semblance to pairing. MI aslo showed 36 univalents in 97% of pollen mother cells. The bivalent like association in MI was as low as 0.03 per cell but the absence of pairing at pachytene and the lack of well defined x'mata suggested that they were only univalents lying closely together due to factors other than true pairing. The later stages were not well defined and univalents were noticed to divide. The scattering of chromosomes and irregular groupings resulted in polyads consequently all the pollen were sterile. The type of asynapsis noticed was ‘complete’. The presence of pollen sterility in all the plants of Ce-258 throughout the season ruled out environmental factors and suggested it was of genic nature.</abstract><cop>Tokyo</cop><pub>Japan Mendel Society, International Society of Cytology</pub><doi>10.1508/cytologia.49.273</doi><tpages>5</tpages><oa>free_for_read</oa></addata></record> |
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| ispartof | CYTOLOGIA, 1984/06/25, Vol.49(2), pp.273-277 |
| issn | 0011-4545 1348-7019 |
| language | eng |
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| source | J-STAGE Free; EZB-FREE-00999 freely available EZB journals |
| subjects | Agronomy. Soil science and plant productions asynapsis Biological and medical sciences chromosome number chromosome pairing Cytogenetics Fundamental and applied biological sciences. Psychology Generalities. Genetics. Plant material Genetics and breeding of economic plants Genetics of eukaryotes. Biological and molecular evolution male sterility Manihot esculenta meiosis Pteridophyta, spermatophyta Vegetals and fungi |
| title | Asynapsis in cassava |
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