Physiological effects of hydroxyl radical (·OH) generating solution as simulated dew on the needle surfaces of Japanese red pine (Pinus densiflora Sieb. et Zucc.)

Masaaki Chiwa, T. Matsuda, N. Nakatani, Y. Sueki, T. Kobayashi, H. Sakugawa

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

To investigate the effects of aqueous phase oxidants on the needle gas exchange of pine seedlings, simulated dew waters generating hydroxyl radicals (·OH) were sprayed onto the needle surfaces of pine seedlings. The nutrient contents and amounts of epicuticular wax of pine needles were also determined as a parameter with the effects of ·OH-generating solutions on gas exchange of pine needles. Two different sources and two different photoformation rates of ·OH-generating solutions, photo-Fenton reagents (100 and 200 μM HOOH- 1 μM Fe(III)- 5 μM oxalate) and 100 and 200 μM N(III), were sprayed three times a week in the early mornings for 3.5 months. The results showed that maximum CO2 assimilation rates (A max) of pine needles treated with the two photo-Fenton reagents and 100 μM N (III) were smaller than those treated with a control solution after treatment; this did not occur with 200 μM N (III). Mg and Ca contents in the needles had positive correlations with Amax among treatments. Amounts of epicuticular wax differed little among treatments. These results implied that needle nutrient status is one of the factors in reductions in A max of pine needles treated with ·OH-generating solutions.

Original languageEnglish
Pages (from-to)237-244
Number of pages8
JournalPhyton - Annales Rei Botanicae
Volume45
Issue number4
Publication statusPublished - Oct 1 2005

Fingerprint

Pinus densiflora
dew
Pinus
conifer needles
hydroxyl radicals
hydroxyl radical
Hydroxyl Radical
Needles
epicuticular wax
wax
gas exchange
seedling
seedlings
Waxes
oxalates
oxalate
Seedlings
oxidants
oxidant
assimilation (physiology)

All Science Journal Classification (ASJC) codes

  • Global and Planetary Change
  • Physiology
  • Ecology, Evolution, Behavior and Systematics
  • Plant Science

Cite this

Physiological effects of hydroxyl radical (·OH) generating solution as simulated dew on the needle surfaces of Japanese red pine (Pinus densiflora Sieb. et Zucc.). / Chiwa, Masaaki; Matsuda, T.; Nakatani, N.; Sueki, Y.; Kobayashi, T.; Sakugawa, H.

In: Phyton - Annales Rei Botanicae, Vol. 45, No. 4, 01.10.2005, p. 237-244.

Research output: Contribution to journalArticle

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