Systemic Signaling in the Photosynthetic Induction Phase of Calamagrostis angustifolia on the Sanjiang Plain Wetland of Northeast China | [International Journal of Agriculture and Biology • 2020]

Author(s):

1. Nan Xu: Harbin University, Harbin, Heilongjiang Province, 150030, China; Natural Resources and Ecology Institute, Heilongjiang Academy of Sciences, Harbin, 150040, China

2. Junnan Ding: Harbin University,Harbin, Heilongjiang Province, 150030,China

3. Yining Wu: Natural Resources and Ecology Institute, Heilongjiang Academy of Sciences,Harbin, 150040,China

4. Jinbo Li: Natural Resources and Ecology Institute, Heilongjiang Academy of Sciences,Harbin, 150040,China

5. Jianbo Wang: Natural Resources and Ecology Institute, Heilongjiang Academy of Sciences,Harbin, 150040,China

6. Haixiu Zhong: Natural Resources and Ecology Institute, Heilongjiang Academy of Sciences,Harbin, 150040,China

7. Hongwei Ni: Natural Resources and Ecology Institute, Heilongjiang Academy of Sciences,Harbin, 150040,China

8. Fei Hou: College of Life Science, Shandong Agricultural University,Harbin 150040, Heilongjiang,China

9. Shaopeng Yu: Harbin University, Harbin, Heilongjiang Province, 150030, China

10. Huihui Zhang: College of Resources and Environment, Northeast Agricultural University,Harbin, Heilongjiang Province, 150030,China

Abstract:

Deyeuxia angustifolia was grown in the Sanjiang plain wetland. The treatments with different light intensities on the different leaf area at different positions, effects of illumination on the photosynthetic induction process of the leaves without preillumination (target leaves) was studied systematically. The possible mechanism and the signal transduction pathway of the systemic regulation were explored. The results showed that illumination of systemic leaves significantly increased the photosynthetic induction rate of target leaves. The time for reaching 50% of the maximum photosynthetic rate in the target leaves was reduced by about 19%, and the time for reaching 90% by about 27%. Either one or multiple systemic leaves were pre-illuminated and the photosynthetic induction rates of target leaves were all significantly accelerated. No significant difference was detected on the extent of the promotion effects of photosynthetic induction rates in target leaves. When the systemic leaves were illuminated with a Photosynthetic Photon Flux Density (PPFD) of 30 µmol m-2 s-1, the photosynthetic induction rate of target leaves was not significantly enhanced. When the systemic leaves were illuminated with PPFDs of 100, 600 or 1300 µmol m-2 s-1, photosynthetic induction rates of target leaves were significantly increased for all values; however, no significant differences were found on the extents of the enhancement effects on the photosynthetic induction rates of the target leaves when the systemic leaves were treated with more than these three light intensities. An effective systemic signaling could only be produced when the systemic leaves were illuminated with a light intensity above a certain threshold, and as soon the illumination exceeded this threshold, the strength of the systemic signaling did not increase with further increase in the light intensity.©

Page(s): 493-500

DOI: 10.17957/IJAB/15.1313

Published: Journal: International Journal of Agriculture and Biology, Volume: 23, Issue: 2, Year: 2020

Keywords:

Systemic signaling , Photosynthetic induction , PSII photochemical efficiency

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