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231223s2006 xx ||||| 00| ||eng c |
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|a eng
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|a Francini, A
|e verfasserin
|4 aut
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|a Enzymatic and non-enzymatic protective mechanisms in recalcitrant seeds of Araucaria bidwillii subjected to desiccation
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|c 2006
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|a Text
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|a ohne Hilfsmittel zu benutzen
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|a Date Completed 01.02.2007
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|a Date Revised 30.09.2020
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a The changes in several antioxidants as well as in the level of C-centered free radicals and thiobarbituric acid reactive substances (TBARS) were studied in seeds of Araucaria bidwillii Hook desiccated to 37%, 28% and 21% moisture content. The lowest-safe moisture content for the seedling establishment was 37%. The embryo, besides double amounts of free radicals, showed higher levels of both enzymatic and non-enzymatic antioxidants than endosperm. Lutein decreased in both organs whereas alpha-tocopherol values were not affected by desiccation. In the embryo at 37% seed moisture content the antioxidant defense system increased giving rise to a decrease in free radicals. Beyond this point, free radicals and TBARS increased in agreement with the umpiring of the ascorbate/glutathione cycle by the decrease in reduced glutathione and glutathione reductase activity (GR, EC 1.6.4.2). At 21% moisture GR decreased. In the endosperm during desiccation, the consumption of ascorbate, total glutathione and lutein prevented the rise in free radicals and TBARS till 28% moisture, at which an increase in oxidized glutathione was also observed
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|a Journal Article
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|a Antioxidants
|2 NLM
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|a Plant Proteins
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|a Glutathione
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|a Galleschi, L
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|e verfasserin
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|a Izzo, R
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|a Sgherri, C
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|a Navari-Izzo, F
|e verfasserin
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|i Enthalten in
|t Plant physiology and biochemistry : PPB
|d 1991
|g 44(2006), 10 vom: 05. Okt., Seite 556-63
|w (DE-627)NLM098178261
|x 1873-2690
|7 nnns
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|g volume:44
|g year:2006
|g number:10
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|g pages:556-63
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