Journal Article

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Tree physiology

Tree Physiol.

Oct

34

10

1090

1101

LR: 20151119; CI: (c) The Author 2014; JID: 100955338; 0 (Amino Acids); 1406-65-1 (Chlorophyll); N762921K75 (Nitrogen); OTO: NOTNLM; 2014/09/20 [aheadofprint]; ppublish

Canada

1758-4469; 0829-318X

PMID: 25240727

eng

Journal Article; Research Support, Non-U.S. Gov't; IM

10.1093/treephys/tpu074 [doi]

Unknown(0)

25240727

Global climate change causes an increase in ambient air temperature, a major environmental factor influencing plant physiology and growth that already has been perceived at the regional scale and is expected to become even more severe in the future. In the present study, we investigated the effect of elevated ambient air temperature on the nitrogen metabolism of two interior provenances of Douglas fi r (Pseudotsuga menziesii var. glauca) originating from contrasting habitats, namely the provenances Monte Creek (MC) from a drier environment and Pend Oreille (PO) from a more humid environment. Three- to four-year-old seedlings of the two provenances were grown for 3 months in controlled environments under either control temperature (day 20 degrees C, night 15 degrees C) or high temperature (HT, 30/25 degrees C) conditions. Total nitrogen (N), soluble protein, chlorophyll and total amino acid (TAA) contents as well as individual amino acid concentrations were determined in both current-year and previous-year needles. Our results show that the foliar total N contents of the two provenances were unaffected by HT. Arginine, lysine, proline, glutamate and glutamine were the most abundant amino acids, which together contributed approximately 88% to the TAA pool of current- and previous-year needles. High temperature decreased the contents of most amino acids of the glutamate family (i.e., arginine, proline, ornithine and glutamine) in current-year needles. However, HT did not affect the concentrations of metabolites related to the photorespiratory pathway, such as [Formula: see text], glycine and serine. In general, current-year needles were considerably more sensitive to HT than previous-year needles. Moreover, provenance PO originating from a mesic environment showed stronger responses to HT than provenance MC. Our results indicate provenance-specific plasticity in the response of Douglas fir to growth temperature. Provenance-specific effects of elevated temperature on N-use efficiency suggest that origin might determine the sensitivity and growth potential of Douglas fir trees in a future warmer climate.

. Published by Oxford University Press

Du,B., Jansen,K., Junker,L.V., Eiblmeier,M., Kreuzwieser,J., Gessler,A., Ensminger,I., Rennenberg,H.

Albert-Ludwigs-Universitat Freiburg, Institut fur Forstwissenschaften, Georges-Kohler-Allee Geb. 053/054, Freiburg i. Br. D-79110, Germany Sichuan Province Key Laboratory of Ecological Security and Protection, Mianyang Normal University, Xianren Road 30,

20140920

http://vp9py7xf3h.search.serialssolutions.com/?charset=utf-8&pmid=25240727

2014