Photosynthesis in different types of transgenic tobacco plants with elevated cytokinin content |
| |
Authors: | J Pospí?ilová H Synková I Machá?ková J ?atský |
| |
Institution: | (1) Institute of Experimental Botany, Academy of Sciences of the Czech Republic, Na Karlovce 1, CZ-160 00 Praha 6, Czech Republic;(2) Norman Borlaug Institute for Plant Science, Institute of Experimental Botany, Academy of Sciences of the Czech Republic, Ke dvoru 15, De Monfort University, CZ-166 30 Praha 6, Czech Republic |
| |
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.
This revised version was published online in July 2006 with corrections to the Cover Date. |
| |
Keywords: | carotenoid content chlorophyll content chlorophyll a fluorescence net photosynthetic rate Nicotiana tabacum photorespiration rate stomatal conductance |
本文献已被 SpringerLink 等数据库收录! |
|