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Bulletin of Botanical Research ›› 2015, Vol. 35 ›› Issue (6): 843-847.doi: 10.7525/j.issn.1673-5102.2015.06.009

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Effects of Leaf-spraying Nitrate on Stomatal Dynamics and Photosynthesis of Syringa oblata Lindl. Leaves

WANG Ke;DIAO Jian;YANG Rui;HU Yan-Bo*;SUN Guang-Yu   

  1. College of Life Science,Northeast Forestry University,Harbin 150040
  • Online:2015-11-20 Published:2016-01-18
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Abstract: With Syringa oblata Lindl. seedling, a greening tree species in Harbin, we investigated the effects of leaf-spraying nitrate(50 mmol·L-1 NaNO3) on stomatal behavior and photosynthetic physiology by gas-exchange and electron microscope techniques. We analyzed stomatal distribution in upper and lower epidermis and stomatal opening as well as photosynthesis-dark respiration induction, photochemical efficiency, chlorophyll content, intercellular CO2 concentration and stomatal conductance. The stomata and glandular hairs are distributed in the upper and lower epidermis, the effects of leaf-spraying depend on treatment time. For five-day treatment, there were no significant differences in the parameters of stomatal behavior and photosynthesis between the treated and controlled leaves. However, 14-day treatment significantly declined stomatal opening and conductance, and inhibited photosynthesis-dark respiration.

Key words: Syringa oblata seedling, nitrate, photosynthesis induction, stomatal opening, dark respiration, photorespiration

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