Protection against photooxidative damage provided by enzymatic and non-enzymatic antioxidant system in sorghum seedlings

Sankhalkar, Sangeeta; Sharma, Prabhat Kumar

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DC Field	Value	Language
dc.contributor.author	Sankhalkar, Sangeeta	-
dc.contributor.author	Sharma, Prabhat Kumar	-
dc.date.accessioned	2013-11-14T05:14:32Z	-
dc.date.available	2013-11-14T05:14:32Z	-
dc.date.issued	2002-11	-
dc.identifier.issn	0975-1009 (Online); 0019-5189 (Print)	-
dc.identifier.uri	http://hdl.handle.net/123456789/23575	-
dc.description	1260-1268	en_US
dc.description.abstract	Effect of photoinhibition of sorghum leaves and isolated chloroplasts on chlorophyll fluorescence, peroxidation of thylakoid lipids and activity of antioxidant enzymes were studied. Photoinhibition of intact leaves and isolate chloroplasts decreased Fv/Fm ratio and qP, while qN increased. Photoinhibitory damage was more at 5°C than at 30° or 50°C. Peroxidation of thylakoid lipids was 5 times greater when photoinhibited at 50°C compared to control. Photoinhibition of chloroplasts under low oxygen condition or when supplemented with anti -ox idants (β-carotene , ascorbate and GSH) resulted in significantly less damage to photosynthesis (Fv/Fm ratio) and peroxidation level. Photoinhibition also resulted in many fold increase in the activity of superoxide dismutase (SOD) and ascorbate peroxidase (APX) and decrease in catalase. Data presented here suggest that photoinhibition resulted in production of oxygen radicals and photoinhibition of chloroplasts in the presence of low oxygen level or when supplemented with antioxidants decreased the damage to Fv/Fm ratio and peroxidation level to a great extent since former prevented the formation of oxygen radicals and later could scavenge the oxygen radicals thus the protection. Increase activity of SOD and APX may also be to metabolise the oxygen radicals produced during photoinhibition treatment, thereby, protecting the seedlings against photooxidative damage.	en_US
dc.language.iso	en_US	en_US
dc.publisher	NISCAIR-CSIR, India	en_US
dc.rights	CC Attribution-Noncommercial-No Derivative Works 2.5 India	en_US
dc.source	IJEB Vol.40(11) [November 2002]	en_US
dc.title	Protection against photooxidative damage provided by enzymatic and non-enzymatic antioxidant system in sorghum seedlings	en_US
dc.type	Article	en_US
Appears in Collections:	IJEB Vol.40(11) [November 2002]

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