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- Title
Photosynthesis and nitrogen allocation in needles in the sun and shade crowns of hybrid larch saplings: effect of nitrogen application.
- Authors
Mao, Q.; Watanabe, M.; Imori, M.; Kim, Y.; Kita, K.; Koike, T.
- Abstract
We studied the effects of applying 50 kg(N) ha year of nitrogen (N) on needle photosynthesis, N allocation and nutrient content in the sun- and shade crowns of the hybrid larch F ( Larix gmelinii var. japonica × L. kaempferi). The light-saturated net photosynthetic rate ( P) was not significantly affected by N application or crown position, although the contents of N, P, K, and chlorophyll (Chl), and the maximum rates of carboxylation and electron transport were lower in needles of the shade crown than of the sun crown. This difference was mainly due to an increase in the intercellular CO concentration ( C) in the needles of the shade crown. Analysis of N allocation in photosynthetic systems revealed that more N was allocated to functions related to electron transport and ribulose-1,5-bisphosphate (RuBP) regeneration in needles of the shade crown. N allocation in needles of the hybrid larch F was regulated mainly by the light conditions, rather than by N application
- Subjects
EFFECT of nitrogen fertilizers on plants; PHOTOSYNTHESIS; LARCHES; CROWNS (Botany); CHLOROPHYLL; ELECTRON transport; PLANTS
- Publication
Photosynthetica, 2012, Vol 50, Issue 3, p422
- ISSN
0300-3604
- Publication type
Article
- DOI
10.1007/s11099-012-0049-z