Responses in growth, physiology and nitrogen nutrition of dragon spruce (Picea asperata) seedlings of different ages to enhanced ultraviolet-B

• Autorzy: Yao X. , Liu Q.
• Języki publikacji: EN

Abstrakty

EN

In the southeast of the Qinghai–Tibetan Plateau of China, dragon spruce (Picea asperata) is a key species and widely used in reforestation processes in the area. The paper mainly studied the effects of ultraviolet-B (UV-B) on growth, physiology and nitrogen nutrition of 3- and 6-year-old dragon spruce seedlings. The experimental design included ambient UV-B (control) and enhanced UV-B (+UV-B, a 30% increase). Enhanced UV-B significantly decreased growth, needle and root nitrogen concentration, needle nitrate reductase activity and increased UV-B absorbing compounds and malondialdehyde (MDA) content of two old dragon spruce seedlings. Glutamine synthetase activity was not affected by enhanced UV-B in two old dragon spruce seedlings. On the other hand, different old seedlings also exhibited different physiological responses to enhanced UV-B radiation. Chlorophyll content, carotenoids content and soluble protein content in 3-year-old seedlings significantly reduced by enhanced UV-B, but those in 6-year-old seedlings were not affected by enhanced UV-B. Proline content of 6-year-old seedlings were increased by enhanced UV-B. Compared with the 3-year-old seedlings, the 6-year-old seedlings showed lower reduction of growth and MDA content, and accumulated more proline and UV-B absorbing compounds for protecting seedlings under enhanced UV-B. The results implicated that 3-year-old seedlings were more sensitivity to enhanced UV-B than 6-year-old seedlings.

• Wydawca: -
• Czasopismo: Acta Physiologiae Plantarum
• Rocznik: 2007
• Tom: 29
• Numer: 3
• Opis fizyczny: p.217-224,fig.,ref.

Twórcy

autor

Yao X.

• Chengdu Institute of Biology, Chinese Academy of Sciences, P.O. Box 416, Chengdu 610041, People's Republic of China
• Graduate School of the Chinese Academy of Sciences, Beijing 100039, People's Republic of China

autor

Liu Q.

• Chengdu Institute of Biology, Chinese Academy of Sciences, P.O. Box 416, Chengdu 610041, People's Republic of China

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