Physiological variations in chloroplasts of Rhodiola coccinea along an altitudinal gradient in Tianshan Mountain

• Autorzy: Chen T. , Zhao Z. , Zhang Y. , Qiang W. , Feng H. , An L. , Li Z.
• Języki publikacji: EN

Abstrakty

EN

For centuries in Asia, Rhodiola coccinea has been used as a valuable adaptogen medicinal plant known for its remarkable resistance to various stress factors. Physiological tolerance in chloroplasts is believed to be an important factor, which affects the geographic distribution of plant species. However, there is currently no report on how the physiological tolerance in the chloroplasts of R. coccinea varies along an altitudinal gradient in a semiarid mountain region. In this work, we investigated the physiological variations of the chloroplasts of R. coccinea plants along an altitudinal gradient in the Tianshan Mountains, which are located in northwest China. It was found that the physiological parameters of chloroplasts in R. coccinea plants, including superoxide generation, fatty acid compositions, thylakoid membrane fluidity, chlorophyll a/b ratios and photosynthetic electron transport rates (ETRs), varied nonlinearly with altitude. Indeed, an inflection point was observed at approximately 3,800 m. For altitudes were higher or lower than 3,800 m, the ETR, index of unsaturated fatty acids in the thylakoid membrane and Chl a/b ratios decreased with increasing altitude, whereas the superoxide generation and DPH polarisation of thylakoid membranes increased. In addition, variations in the AsA and GSH contents of chloroplasts could be divided into two distinct phases along the altitudinal gradient. The AsA content slowly decreased with increasing altitudes up to 3,800 m and rapidly decreased above 3,800 m. However, there was a gradual increase in the GSH content between 3,570 and 3,750 m, followed by an abrupt rise to a plateau level. These results demonstrate that the physiological tolerance of chloroplasts widely varies with altitude and have a tight relationship with the range of growth altitude of R. coccinea in Tianshan Mountains.

• Wydawca: -
• Czasopismo: Acta Physiologiae Plantarum
• Rocznik: 2012
• Tom: 34
• Numer: 3
• Opis fizyczny: p.1007-1015,fig.,ref.

Twórcy

autor

Chen T.

• State Key Laboratory of Cryospheric Sciences, Cold and Arid Regions Environmental and Engineering Research Institute, 730000 Lanzhou, China

autor

Zhao Z.

• School of Life Science, Key Lab of Arid and Grassland Agroecology of MOE, Lanzhou University, 730000 Lanzhou, China

autor

Zhang Y.

• Agriculture College, Henan University of Science and Technology, 471003 Luoyang, China

autor

Qiang W.

• School of Life Science, Key Lab of Arid and Grassland Agroecology of MOE, Lanzhou University, 730000 Lanzhou, China

autor

Feng H.

• School of Life Science, Key Lab of Arid and Grassland Agroecology of MOE, Lanzhou University, 730000 Lanzhou, China

autor

An L.

• School of Life Science, Key Lab of Arid and Grassland Agroecology of MOE, Lanzhou University, 730000 Lanzhou, China

autor

Li Z.

• State Key Laboratory of Cryospheric Sciences, Cold and Arid Regions Environmental and Engineering Research Institute, 730000 Lanzhou, China

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