ISSN:
1573-8264
Keywords:
carotenoid content
;
chlorophyll content
;
chlorophyll a fluorescence
;
net photosynthetic rate
;
Nicotiana tabacum
;
photorespiration rate
;
stomatal conductance
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract Photosynthetic parameters were compared in three types of transgenic tobacco plants: ipt-transgenic plants with slightly elevated endogenous cytokinin (CK) content, Pssu-ipt-transgenic plants with markedly increased CK content, and zmp-transgenic plants with slightly elevated CK content accompanied by elevated auxin content. Slightly increased CK content promoted net photosynthetic rate (PN) in both ipt- and zmp-transgenic plants, and chlorophyll (Chl) and carotenoid contents in zmp-transgenic plants. Morphology, growth characteristics, stomatal conductance, and parameters of Chl a fluorescence kinetics were similar in control and transgenic plants with slightly higher CK content. No significant effect of increased level of endogenous auxin (indole-3-acetic acid) on development of zmp-transgenic plants and measured parameters was found. Pssu-ipt-transgenic plants with highly increased CK content revealed suppressed root development, wilting of plants, and depression of PN and stomatal conductance; however, Chl content was slightly increased and parameters of Chl a fluorescence kinetics did not indicate damage to photosynthetic apparatus.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1000948602094
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