Please use this identifier to cite or link to this item: https://scholarbank.nus.edu.sg/handle/10635/99681
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dc.titleGenomic and meiotic analysis of Mokara orchids
dc.contributor.authorLee, Y.H.
dc.date.accessioned2014-10-27T07:03:06Z
dc.date.available2014-10-27T07:03:06Z
dc.date.issued1994
dc.identifier.citationLee, Y.H. (1994). Genomic and meiotic analysis of Mokara orchids. Journal of Heredity 85 (1) : 39-42. ScholarBank@NUS Repository.
dc.identifier.issn00221503
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/99681
dc.description.abstractMokara orchids are the special group of artificially created trigeneric hybrids involving members of Vanda, Arachnis, and Ascocentrum, the genomic symbols of which are often designated as V, A, and As, respectively. Eight Mokara clonal cultivars grown commercially in Singapore were selected for genomic and meiotic investigation. They were classified into three categories based on their diverse origins. Three cultivars derived from 2x-Arachnis x 2x-(Vanda x Ascocentrum) were found to be diploid (2n = 38), and their genomic constitutions were likely to be A + 1/2 (As + V). Their microsporocytes exhibited low frequencies of bivalents, which could have involved A-As and/or A-V chromosome pairs. All four cultivars derived from 2x-(Arachnis x Vanda) x 2x-(Ascocentrum x Vanda) were triploid with an inferred genomic content of A + V + 1/2 (As + V). Up to 19 bivalents were detected in the microsporocytes. These were most likely formed between related pairs of V-As and V-V chromosomes and possibly A-As. The only cultivar obtained from 2x-Mokara x 2x-(Ascocentrum x Vanda) was also triploid, but its genomic makeup was likely to be A + 1/2 (As + V) + 1/2 (As + V). Large numbers of bivalents occurred, probably representing mainly As-As, As-V, and V-V chromosome pairs. However, the integrity of individual chromosomes could not be assumed because prior intergenomic recombination could have occurred in parents. Triploid cultivars of both genomic types were more vigorous and generally more horticulturally desirable for cut-flower production than their diploid counterparts.
dc.sourceScopus
dc.typeArticle
dc.contributor.departmentBOTANY
dc.description.sourcetitleJournal of Heredity
dc.description.volume85
dc.description.issue1
dc.description.page39-42
dc.description.codenJOHEA
dc.identifier.isiutNOT_IN_WOS
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