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http://hdl.handle.net/1942/13461
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Title: | Evaluation of the photosynthetic activity in transgenic tobacco plants with altered endogenous cytokinin content: lessons from cytokinin |
Authors: | Cortleven, Anne Valcke, Roland |
Issue Date: | 2012 |
Citation: | PHYSIOLOGIA PLANTARUM, 144 (4), p. 394-408 |
Abstract: | Cytokinin is known to be involved in many processes related to plastid
development and function but the exact role of cytokinin in photosynthesis
remains elusive. To investigate more profoundly the effects of cytokinin in
this process, the photosynthetic activity of transgenic Pssu-ipt and 35S:CKX1
tobacco (Nicotiana tabacum) plants with respectively elevated and reduced
endogenous cytokinin content was evaluated. Pigment analysis indicated
that elevated endogenous cytokinin content resulted in increased pigment
content. Functional analysis of the photosynthetic apparatus by chlorophyll
a fluorescence and in vitro electron transport measurements clearly showed
that changing the endogenous cytokinin content affects the activity of
the photosynthetic apparatus. Surprisingly, both an increase as well as a
decrease in cytokinin content results in a better photosynthetic performance.
Quenching analysis revealed that the initial responses of the photosynthetic
apparatus on a dark-light transition are not affected by changed cytokinin
content. However, it has an effect on the further kinetic behavior. Taken
together, we suggest that cytokinins can induce structural changes in the
different parts of the electron transport chain as also demonstrated by the in
vitro electron transport measurements. |
URI: | http://hdl.handle.net/1942/13461 |
DOI: | 10.1111/j.1399-3054.2011.01558.x |
ISI #: | 000301486400008 |
ISSN: | 0031-9317 |
Category: | A1 |
Type: | Journal Contribution |
Validation: | ecoom, 2014
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Appears in Collections: | Research publications
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