期刊
FRONTIERS IN PLANT SCIENCE
卷 8, 期 -, 页码 -出版社
FRONTIERS MEDIA SA
DOI: 10.3389/fpls.2017.00945
关键词
dynamic photosynthesis; high temperature; leaf hydraulic conductance; nitrogen; steady-state photosynthesis
资金
- National Key Research and Development Program of China [2016YED0300102]
- National Natural Science Foundation of China [31301840]
- Foundation for the Author of National Excellent Doctoral Dissertation of PR China [201465]
- Fundamental Research Funds for the Central Universities [2662015PY031]
Nitrogen is one of the most important elements for plants and is closely related to photosynthesis. High temperature stress significantly inhibits photosynthesis under both steady-state and flecked irradiance. However, it is not known whether nitrogen can affect the decrease in photosynthesis caused by high temperature, especially under flecked irradiance. In the present study, a pot experiment was conducted under two nitrogen (N) supplies with rice plants, and the steady-state and dynamic photosynthesis rates were measured under 28 and 40 degrees C. High temperature significantly increased leaf hydraulic conductance (K-leaf) under high N supply (HN) but not under low N supply (LN). The increased K-leaf maintained a constant leaf water potential (psi(leaf)) and steady-state stomatal conductance (g(s,sat)) under HN, while the deaf and gs sat significantly decreased under high temperature in LN conditions. This resulted in a more severe decrease in steady-state photosynthesis (A(sat)) under high temperature in the LN conditions. After shifting from low to high light, high temperature significantly delayed the recovery of photosynthesis, which resulted in more carbon loss under flecked irradiance. These effects were obtained under HN to a lesser extent than under LN supply. Therefore, it is concluded that nitrogen can alleviate the inhibition of photosynthesis caused by high temperature stress under both steady-state and flecked irradiance.
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