Age Mediated Effects on the Alternative Respiratory Pathway in Leaves of Rhodiola rosea and Ajuga reptans

Natalia V. PYSTINA; Roman A. DANILOV

Makale detayları

Age Mediated Effects on the Alternative Respiratory Pathway in Leaves of Rhodiola rosea and Ajuga reptans

Yazarlar:

Natalia V. PYSTINA | Roman A. DANILOV

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Botany 2002 Vol.26 Issue 4, pp.207-212

Belge Tipi:

Makale

Yayın Tarihi:

3/2002

Belge Dili:

Türkçe

Document ID (Org No.):

2000724397

Sıklık:

İki Aylık

eISSN:

1303-6106

pISSN:

1300-008X

Özet:

 

The influence of aging processes on respiration and the ratio of respiratory pathways in the leaves of Rhodiola rosea L. and Ajuga reptans L. under natural conditions was investigated. Young leaves had a higher respiration rate and higher activity of the alternative respiratory pathway than did mature leaves. The capacity of the alternative respiratory pathway did not show significant differences between the young and mature leaves of R. rosea and increased in the mature leaves of A. reptans (from 60% up to 88%). This fact may be explained by the higher requirements of growing tissues for metabolites. In this case, the alternative pathway could be responsible for the continuous activity of the citric acid cycle and glycolysis, and, therefore, deliver additional metabolites. The decline in activity of the alternative pathway with aging could be explained by the lower demand of the older leaves in metabolites. The high capacity of the alternative respiratory pathway in the mature leaves may be considered evidence of a high respiratory potential. We believe that this phenomenon may be explained by the fact that leaves are frequently confronted with numerous stress events during their life and, as a consequence, increase the respiratory capacity as a tool of stress resistance.

 

The influence of aging processes on respiration and the ratio of respiratory pathways in the leaves of Rhodiola rosea L. and Ajuga reptans L. under natural conditions was investigated. Young leaves had a higher respiration rate and higher activity of the alternative respiratory pathway than did mature leaves. The capacity of the alternative respiratory pathway did not show significant differences between the young and mature leaves of R. rosea and increased in the mature leaves of A. reptans (from 60% up to 88%). This fact may be explained by the higher requirements of growing tissues for metabolites. In this case, the alternative pathway could be responsible for the continuous activity of the citric acid cycle and glycolysis, and, therefore, deliver additional metabolites. The decline in activity of the alternative pathway with aging could be explained by the lower demand of the older leaves in metabolites. The high capacity of the alternative respiratory pathway in the mature leaves may be considered evidence of a high respiratory potential. We believe that this phenomenon may be explained by the fact that leaves are frequently confronted with numerous stress events during their life and, as a consequence, increase the respiratory capacity as a tool of stress resistance.

Makale detayları

Age Mediated Effects on the Alternative Respiratory Pathway in Leaves of Rhodiola rosea and Ajuga reptans

Yazarlar: Natalia V. PYSTINA | Roman A. DANILOV

Yayıncı: TUBITAK

Dergi: Turkish Journal of Botany 2002 Vol.26 Issue 4, pp.207-212

Belge Tipi: Makale

Yayın Tarihi: 3/2002

Belge Dili: Türkçe

Document ID (Org No.): 2000724397

Sıklık: İki Aylık

eISSN: 1303-6106

pISSN: 1300-008X

Sayı

Yazarlar:

Natalia V. PYSTINA | Roman A. DANILOV

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Botany 2002 Vol.26 Issue 4, pp.207-212

Belge Tipi:

Makale

Yayın Tarihi:

3/2002

Belge Dili:

Türkçe

Document ID (Org No.):

2000724397

Sıklık:

İki Aylık

eISSN:

1303-6106

pISSN:

1300-008X