Please use this identifier to cite or link to this item: https://doi.org/10.1016/S0098-8472(98)00024-0
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dc.titlePattern of photoassimilate partitioning in pseudobulbous and rhizomatous terrestrial orchids
dc.contributor.authorHew, C.S.
dc.contributor.authorKoh, K.T.
dc.contributor.authorKhoo, G.H.
dc.date.accessioned2014-10-27T08:36:17Z
dc.date.available2014-10-27T08:36:17Z
dc.date.issued1998-10
dc.identifier.citationHew, C.S., Koh, K.T., Khoo, G.H. (1998-10). Pattern of photoassimilate partitioning in pseudobulbous and rhizomatous terrestrial orchids. Environmental and Experimental Botany 40 (2) : 93-104. ScholarBank@NUS Repository. https://doi.org/10.1016/S0098-8472(98)00024-0
dc.identifier.issn00988472
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/101354
dc.description.abstractPhotoassimilate partitioning patterns in two terrestrial orchids, Spathoglottis unguiculata and Bromheadia finlaysoniana, were mapped using a 14CO2 dosing technique. A highly integrated source-sink photoassimilate partitioning pattern was observed in both orchids. In S. unguiculata, a pseudobulbous terrestrial orchid, all test leaves supplied similar percentages of 14C-assimilates to all plant parts on a single shoot. In both orchids, the inflorescence during the reproductive stage and the axillary bud during the vegetative stage had the highest sink activity and percentage distribution of 14C-assimilates. A high percentage of 14C-assimilates was imported by the pseudobulb of S. unguiculata. The pseudobulb accumulated a higher percentage of 14C-assimilates (44%) during the vegetative stage than during the flowering stage (21-30%). In B. finlaysoniana, a rhizomatous terrestrial orchid, a high percentage of 14C-photoassimilates was observed in the stem internodes at all three developmental growth stages (the vegetative stage (stage 1), the flowering stage (stage 2) and the fruiting stage (stage 4)). Sink activities of the rhizome were higher at stages 1 and 4 than at stage 2. A similar pattern of photoassimilate partitioning was observed for B. finlaysoniana grown naturally in its habitat. A polar movement of 14C-assimilates towards the major sink (inflorescence) was observed in the current shoot of field plants with a competing sink (axillary bud).
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1016/S0098-8472(98)00024-0
dc.sourceScopus
dc.subjectBromheadia finlaysoniana
dc.subjectPhotoassimilate partitioning
dc.subjectPseudobulb
dc.subjectRhizome
dc.subjectSpathoglottis unguiculata
dc.subjectStem internode
dc.subjectTropical terrestrial orchids
dc.typeArticle
dc.contributor.departmentBIOLOGICAL SCIENCES
dc.description.doi10.1016/S0098-8472(98)00024-0
dc.description.sourcetitleEnvironmental and Experimental Botany
dc.description.volume40
dc.description.issue2
dc.description.page93-104
dc.description.codenEEBOD
dc.identifier.isiut000076239500001
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