Accumulation of pathogenesis-related proteins in barley leaf intercellular spaces during leaf senescence |
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Authors: | L Tamás M Čiamporová M Luxová |
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Institution: | (1) Slovak Academy of Sciences, Dúbravská cesta 14, Institute of Botany, SK-842 23 Bratislava, Slovak Republic |
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Abstract: | Accumulation of the pathogenesis-related (PR) proteins localised in intercellular spaces of barley primary leaves, chlorophyll
content, structure of chloroplasts, and photosynthesis were examined during natural and in vitro induced leaf senescence (cultivation
of whole plants in the dark or detached leaves under nutrient deficiency). Some of PR proteins accumulated during natural
senescence, but their accumulation pattern was different from those of pathogen-induced as well as during in vitro-induced
senescence, which indicate different molecular bases of these processes. Photosynthetic rate and chlorophyll content indicate
that natural senescence of barley primary leaves began from 15th day after sowing. In 35-d-old first leaves, the chloroplasts
showed typical characteristics of senescence as significant decrease of size, greater grana, and prominent plastoglobuli.
The chloroplasts contained more grana under in vitro induced senescence and they had reduced length in the dark. Correspondingly,
accumulation of PR proteins was detectable on about the 15th day but the content of some PR proteins increased in later stages
of senescence.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | chlorophyll content chloroplast structure Hordeum vulgare intercellular washing fluid photosynthetic rate powdery mildew |
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