Changes in Chlorophyll-Carotenoid Contents, Antioxidant Enzyme Activities and Lipid Peroxidation Levels in Zn-Stressed Mentha pulegium

Nilgün CANDAN

Makale detayları

Changes in Chlorophyll-Carotenoid Contents, Antioxidant Enzyme Activities and Lipid Peroxidation Levels in Zn-Stressed Mentha pulegium

Yazarlar:

Nilgün CANDAN

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Chemistry 2003 Vol.27 Issue 1, pp.21-30

Belge Tipi:

Makale

Yayın Tarihi:

12/2002

Belge Dili:

Türkçe

Document ID (Org No.):

2000729660

Sıklık:

İki Aylık

eISSN:

1303-6130

pISSN:

1300-0527

Özet:

 

The relationships between chlorophyll-carotenoid contents,  the antioxidant enzyme activities, such as superoxide dismutase (SOD),  catalase (CAT), ascorbate-dependent peroxidase (AsA-dep POD) and  guaiacol-dependent peroxidase (Gua-dep POD), and lipid peroxidation  (LPO) levels were investigated in leaves at different positions of M.  pulegium grown in nutrient medium containing 0-1 m M Zn.  The  maximum chlorophyll-carotenoid content's SOD and CAT activities and  the minimum LPO level were observed in leaf 6 at 7.6 10-2 m M  Zn (as control).  While chlorophyll-carotenoid contents in the absence  of Zn were lower than those of the control, SOD and CAT activities  significantly increased with decreasing Zn concentration.  With excess  Zn, chlorophyll-carotenoid content exhibited a trend similar to that  of the control.  However, SOD, CAT and Gua-dep POD activities and also  AsA-dep POD activities after leaf position 4 were inhibited by excess  Zn.  Absence of Zn in the nutrient medium caused significantly higher  LPO levels than in the control.  Excess Zn showed its toxic effects  after leaf position 4.  The effects of decreasing Zn concentrations in  the range 7.67-1.8 10-2 m M on the same parameters were also  investigated with respect to time.  The sharp decreases in antioxidant  enzyme activities caused increasing LPO levels after the 12th day.   According to the results, the highest antioxidative capacity of M.  pulegium is in the range 0.38-7.67 10-2 m M, which is  the optimum for preventing Fe2+-initiated lipid peroxidation.

 

The relationships between chlorophyll-carotenoid contents,  the antioxidant enzyme activities, such as superoxide dismutase (SOD),  catalase (CAT), ascorbate-dependent peroxidase (AsA-dep POD) and  guaiacol-dependent peroxidase (Gua-dep POD), and lipid peroxidation  (LPO) levels were investigated in leaves at different positions of M.  pulegium grown in nutrient medium containing 0-1 m M Zn.  The  maximum chlorophyll-carotenoid content's SOD and CAT activities and  the minimum LPO level were observed in leaf 6 at 7.6 10-2 m M  Zn (as control).  While chlorophyll-carotenoid contents in the absence  of Zn were lower than those of the control, SOD and CAT activities  significantly increased with decreasing Zn concentration.  With excess  Zn, chlorophyll-carotenoid content exhibited a trend similar to that  of the control.  However, SOD, CAT and Gua-dep POD activities and also  AsA-dep POD activities after leaf position 4 were inhibited by excess  Zn.  Absence of Zn in the nutrient medium caused significantly higher  LPO levels than in the control.  Excess Zn showed its toxic effects  after leaf position 4.  The effects of decreasing Zn concentrations in  the range 7.67-1.8 10-2 m M on the same parameters were also  investigated with respect to time.  The sharp decreases in antioxidant  enzyme activities caused increasing LPO levels after the 12th day.   According to the results, the highest antioxidative capacity of M.  pulegium is in the range 0.38-7.67 10-2 m M, which is  the optimum for preventing Fe2+-initiated lipid peroxidation.

Makale detayları

Changes in Chlorophyll-Carotenoid Contents, Antioxidant Enzyme Activities and Lipid Peroxidation Levels in Zn-Stressed Mentha pulegium

Yazarlar: Nilgün CANDAN

Yayıncı: TUBITAK

Dergi: Turkish Journal of Chemistry 2003 Vol.27 Issue 1, pp.21-30

Belge Tipi: Makale

Yayın Tarihi: 12/2002

Belge Dili: Türkçe

Document ID (Org No.): 2000729660

Sıklık: İki Aylık

eISSN: 1303-6130

pISSN: 1300-0527

Sayı

Yazarlar:

Nilgün CANDAN

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Chemistry 2003 Vol.27 Issue 1, pp.21-30

Belge Tipi:

Makale

Yayın Tarihi:

12/2002

Belge Dili:

Türkçe

Document ID (Org No.):

2000729660

Sıklık:

İki Aylık

eISSN:

1303-6130

pISSN:

1300-0527