期刊
ENVIRONMENTAL AND EXPERIMENTAL BOTANY
卷 99, 期 -, 页码 180-188出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.envexpbot.2013.11.017
关键词
Night-time gas exchange; Nitrogen availability; Nocturnal transpiration; Predawn stomatal opening; Water-use strategies
资金
- Estonian Science Foundation [7736, 9186]
- Estonian Ministry of Education and Research [SF0180025s12]
- EU through the European Regional Development Fund (Centre of Excellence in Environmental Adaptation)
- European Regional Development Fund [3.2.0802.11-0043]
Although the impact of nitrogen availability on the night-time water relations of plants has received a lot of attention during the last decade, knowledge of how these two traits are interrelated is contradictory and still limited. The aim of the current study was to investigate the impact of leaf nitrogen concentration on night-time (E-nap) and daytime (E-d) transpiration rate, nightly water-use percentage of daytime water use (NWU), and increase in night-time transpiration rate (INT) in artificial predawn hours in the cut shoots of 16 woody species measured in the controlled conditions of a growth chamber. Two distinct patterns of night-time water use associated with leaf nitrogen concentration ([NI) were observed: shoots with high NWU were characterised by significantly (P<0.05) lower [N], whereas shoots with highest INT had greater [N]. The forward stepwise regression analysis revealed that variability in E-d, NWU and INT depended on [N], whereas the impact of other predictor variables (leaf phosphorus concentration, habitat soil water content and light availability) was insignificant (P>0.05). Our results suggest that high NWU could potentially compensate limited nitrogen uptake in species able to grow in nutrient-poor habitats. Furthermore, night-time stomatal regulation mechanisms may differ between species according to their [N] and this may explain the contradictory results between previous studies. (C) 2013 Elsevier B.V. All rights reserved.
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