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• W2487948483 abstract "The possible causal relationship between the percentage intercellular spaces in the leaf palisade parenchyma and water use efficiency (WUE) was investigated in related Nicotiana tabacum L. genotypes grown under controlled environmental conditions. Experimental observations included the initial quantification of the percentage intercellular spaces, and the measurement of gas exchange by infra-red gas analysis prior to, during, and after recovery from drought stress. Statistically significant differences in the percentage intercellular spaces per surface area existed between the respective genotypes. The percentage intercellular spaces correlated positively with the pre-stress photosynthetic and transpiration rates, as well as with the WUE of drought-stressed plants, but negatively with the WUE of recovered plants and the rate of stomatal conductance during and after drought stress. It is concluded that in air-cured tobacco, high pre-stress photosynthetic rates are accompanied by high transpiration rates in genotypes with a high percentage of intercellular spaces. This discourages use of the former in drought tolerance selection programmes, as used in the past, while selection on the basis of a smaller percentage intercellular spaces would seem to be a more valid screening parameter. This contention is supported by data which indicate that the genotypes with a high percentage intercellular spaces maintain a higher degree of WUE when drought-stressed by sharply decreasing their stomatal conductance, but, contrary to the genotypes with a lower percentage intercellular spaces, they are unable to reachieve or exceed their pre-stress WUE when rewatered. Die moontlike oorsaaklike verwantskap tussen die persentasie intersellulêre ruimtes in die palissadeparenchiem van blare en waterverbruikseffektiwiteit (WUE) is in verwante (luggedroogde) genotipes van Nicotiana tabacum L., wat onder gekontroleerde omgewingstoestande gegroei het, ondersoek. Eksperimentele waarnemings het die aanvanklike kwantifisering van die persentasie intersellulêre ruimtes en die bepaling van gaswisseling deur infrarooigasanalise voor, gedurende en na herstel van vogstremming, ingesluit. Statisties betekenisvolle verskille bestaan ten opsigte van die persentasie intersellulêre ruimtes per oppervlakeenheid tussen die verskillende genotipes. Die persentasie intersellulêre ruimtes toon ’n positiewe korrelasie met die fotosintese- en transpirasietempo’s van die ongestremde plante, sowel as met die WUE van die voggestremde plante, maar ’n negatiewe korrelasie met die WUE van die herstelde plante en die tempo van stomageleiding gedurende en na vogstremming. Die gevolgtrekking word gemaak dat in luggedroogde tabak, hoë fotosintesetempo’s van ongestremde plante gepaard gaan met hoë transpirasietempo’s in die genotipes met ’n hoë persentasie intersellulêre ruimtes. ’n Hoë fotosintesetempo van die ongestremde plante moet dus nie as seleksiekriterium vir vogstremmingsverdraagsaamheid gebruik word soos wat in die verlede die geval was nie. Seleksie vir ’n kleiner persentasie intersellulêre ruimtes blyk ’n meer betroubare seleksieparameter te wees. Hierdie standpunt word ondersteun deur data wat daarop dui dat die genotipes met ’n hoë persentasie intersellulêre ruimtes ’n hoër mate van WUE gedurende vogstremming handhaaf deur ’n skerp afname in die stomageleiding, maar dat hulle, in teenstelling met genotipes met ’n laer persentasie intersellulêre ruimtes, nie in staat is om na benatting die kontrole WUE te bereik of te oorskry nie." @default.
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• W2487948483 title "Intercellular space variation among air-cured Nicotiana tabacum L. genotypes and its relation to their water use efficiency" @default.
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