Steady-state and dynamic photosynthetic performance and nitrogen partitioning in the shade-demanding plant Panax notoginseng under different levels of growth irradiance

• Autorzy: Chen J.-W. , Kuang S.-B. , Long G.-Q. , Meng Z.-G. , Li L.-G. , Chen Z.-J. , Zhang G.-H. , Yang S.-C.
• Języki publikacji: EN

Abstrakty

EN

In this study, we examined steady-state and dynamic photosynthetic performance and leaf nitrogen (N) partitioning in the typical shade-demanding herb Panax notoginseng grown along a light gradient. Gas exchange on a leaf area basis was significantly reduced under low irradiance, with gas exchange on a leaf mass basis reaching a maximum value and then decreasing along the light gradient. Specific leaf area significantly increased with decreasing irradiance levels (P<0.001), whereas carboxylation efficiency was decreased (P<0.001). In addition, decreasing growth irradiance levels led to declines in maximum carboxylation rate (Vcmax) and maximum electron transport rate (Jmax), although Vcmax/ mass and Jmax/mass were relatively less affected than Vcmax/area and Jmax/area. Slow photosynthetic response to simulated sunflecks was observed under low levels of growth irradiance, with stomatal limitations only detected in leaves grown under low-light conditions. Chlorophyll content increased significantly with decreasing irradiance levels. N content on a leaf mass basis apparently increased, while N content on a leaf area basis markedly decreased. The fraction of leaf N allocated to light-harvesting components increased significantly with decreasing growth irradiance levels, whereas the fraction allocated to carboxylation and bioenergetics was significantly reduced. As an adaptation strategy to growth irradiance, we conclude that adjustments in specific leaf area may be more important than changes in leaf physiology and biochemistry in typical shade-demanding species such as P. notoginseng.

Słowa kluczowe

EN

Panax notoginseng; photosynthetic performance; nitrogen; shade-demanding plant; different level; growth irradiance; leaf area

• Wydawca: -
• Czasopismo: Acta Physiologiae Plantarum
• Rocznik: 2014
• Tom: 36
• Numer: 09
• Opis fizyczny: p.2409-2420,fig.,ref.

Twórcy

autor

Chen J.-W.

• Yunnan Research Center on Good Agricultural Practice for Dominant Chinese Medicinal Materials, Yunnan Agricultural University, 650201 Kunming, Yunnan, People's Republic of China
• Department of Crop Science, College of Agronomy and Biotechnology, Yunnan Agricultural University, 650201 Kunming, Yunnan, People's Republic of China

autor

Kuang S.-B.

• Yunnan Research Center on Good Agricultural Practice for Dominant Chinese Medicinal Materials, Yunnan Agricultural University, 650201 Kunming, Yunnan, People's Republic of China
• Department of Crop Science, College of Agronomy and Biotechnology, Yunnan Agricultural University, 650201 Kunming, Yunnan, People's Republic of China

autor

Long G.-Q.

• Yunnan Research Center on Good Agricultural Practice for Dominant Chinese Medicinal Materials, Yunnan Agricultural University, 650201 Kunming, Yunnan, People's Republic of China
• Department of Plant Nutrition, College of Resource and Environment, Yunnan Agricultural University, 650201 Kunming, Yunnan, People's Republic of China

autor

Meng Z.-G.

• Yunnan Research Center on Good Agricultural Practice for Dominant Chinese Medicinal Materials, Yunnan Agricultural University, 650201 Kunming, Yunnan, People's Republic of China

autor

Li L.-G.

• Yunnan Research Center on Good Agricultural Practice for Dominant Chinese Medicinal Materials, Yunnan Agricultural University, 650201 Kunming, Yunnan, People's Republic of China

autor

Chen Z.-J.

• Institute of Panax Notoginseng, Wenshan University, 663000 Wenshan, Yunnan, People's Republic of China

autor

Zhang G.-H.

• Yunnan Research Center on Good Agricultural Practice for Dominant Chinese Medicinal Materials, Yunnan Agricultural University, 650201 Kunming, Yunnan, People's Republic of China

autor

Yang S.-C.

• Yunnan Research Center on Good Agricultural Practice for Dominant Chinese Medicinal Materials, Yunnan Agricultural University, 650201 Kunming, Yunnan, People's Republic of China

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Identyfikatory

DOI

10.1007/s11738-014-1614-9