title: Intraspecific responses of six Indian clover cultivars under ambient and elevated levels of ozone.
abstract: Intraspecific variation in six cultivars of clover Trifolium alexandrinum L., (Bundel, Wardan, JHB-146, Saidi, Fahli, and Mescavi) has been studied with ambient and elevated O3 (ambient + 10 ppb O3) in open top chambers. Significant effect of elevated O3 was detected on different morphological, physiological, and biochemical parameters depicting differential response among the test cultivars. Results showed that the magnitude of O3 induced foliar injury symptoms varied in all the cultivars. Ozone significantly depressed photosynthetic rate, stomatal conductance, and photosynthetic efficiency, although variations were cultivar specific. Ozone treatment diminished total biomass of all the cultivars; reduction was highest in Wardan with least O3 resistance followed by Bundel, JHB-146, Saidi, Mescavi, and Fahli. According to the cumulative sensitive index, variations in the sensitivity showed that two cultivars (Wardan and Bundel) were sensitive to elevated O3, while other three cultivars (Fahli, Saidi, and Mescavi) were resistant, and JHB-146 showed intermediate sensitivity. Therefore, the present study supported the selection of sensitive cultivar of clover as a bioindicator for O3 under Indian conditions for the areas experiencing higher concentrations of O3.
authors: Department of Botany, Laboratory of Air Pollution and Global Climate Change, Banaras Hindu University, Varanasi, 221005, India.
authors: Nivedita
authors: N
authors: Chaudhary
authors: S B
authors: SB
authors: Agrawal
mesh_terms: D000393:Air Pollutants / Q000633:toxicity*; D002338:Carotenoids / Q000378:metabolism; D002734:Chlorophyll / Q000378:metabolism; D004784:Environmental Monitoring; D007194:India; D015227:Lipid Peroxidation / Q000187:drug effects; D010126:Ozone / Q000633:toxicity*; D010544:Peroxidases / Q000378:metabolism; D010788:Photosynthesis / Q000187:drug effects; D018515:Plant Leaves / Q000187:drug effects / Q000502:physiology; D013045:Species Specificity; D013482:Superoxide Dismutase / Q000378:metabolism; D013481:Superoxides / Q000378:metabolism; D029921:Trifolium / Q000187:drug effects* / Q000502:physiology
chemical_list: D000393:Air Pollutants; D013481:Superoxides; D002734:Chlorophyll; D002338:Carotenoids; D010126:Ozone; D010544:Peroxidases; D013482:Superoxide Dismutase
references: Biochem Soc Trans. 1996 May;24(2):472-8
references: 8736787
references: J Exp Bot. 2005 Feb;56(412):725-36
references: 15611147
references: Sci Total Environ. 2003 Jan 1;301(1-3):205-13
references: 12493197
references: Environ Pollut. 2001;112(3):303-9
references: 11291436
references: Arch Biochem Biophys. 1968 Apr;125(1):189-98
references: 5655425
references: Ecotoxicol Environ Saf. 2012 Nov;85:1-12
references: 22986091
references: Rev Environ Contam Toxicol. 2011;212:61-111
references: 21432055
references: Anal Biochem. 1976 Feb;70(2):616-20
references: 817618
references: J Integr Plant Biol. 2009 Apr;51(4):337-51
references: 21452584
references: J Environ Monit. 2006 Jan;8(1):25-32
references: 16395456
references: Adv Enzymol Relat Areas Mol Biol. 1974;41(0):35-97
references: 4371571