|Table of Contents|

Dynamic of Photosynthetic Apparatus in Tomato Leaf as a Response to  Duty Cycle of Pulsed Light(PDF)

《北方园艺》[ISSN:1001-0009/CN:23-1247/S]

Issue:
2017年13
Page:
1-6
Research Field:
Publishing date:

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Title:
Dynamic of Photosynthetic Apparatus in Tomato Leaf as a Response to  Duty Cycle of Pulsed Light
Author(s):
Dynamic of Photosynthetic Apparatus in Tomato Leaf as a Response to  Duty Cycle of Pulsed Light
XUE Zhanjun1,ZHU Cuimin1,GAO Zhikui1,GAO Rongfu2
Keywords:
pulsed light; duty cycle; light conversion efficiency; chlorophyll a fluorescence
PACS:
-
DOI:
10.11937/bfyy.20170782
Abstract:
The dynamic process of net photosynthetic rate (Pn) accompanied chlorophyll a fluorescence was measured by using portable photosynthesis system (CIRAS-2) and fiber optical spectrometer(QE65000) when tomato leaf was illuminated with different duty cycles of pulsed light (frequencies of 0.04 Hz and 0.40 Hz) from lightemitting diodes (LEDs,peak wavelength of about 622 nm).The results showed that,the oscillation phenomenon of Pn showed peak-valley type only in 0.04 Hz pulsed light with different duty cycle.With increasing of duty cycle,actual light conversion efficiency (aLCE) gradually increased to maximal value at 40% duty cycle for 0.40 Hz and 60% duty cycle for 0.04 Hz,respectively.However,the higher aLCE associated with lower duty cycle (<60%）was present for 0.04 Hz than 0.40 Hz.Under 0.04 Hz pulsed light illumination with 30%-40% duty cycle,the maximum value of relative variable quantity of assimilatory charge (rAC),which related to RuBP consumption and regeneration,played an important role in its photosynthetic oscillation.Furthermore,the peak size and its emerged time of chlorophyll a fluorescence (CF) gradually reduced and delayed when duty cycle of pulsed light varied from 20% to 80% at 0.04 Hz and 0.40 Hz.Consequently,the duty cycle of pulsed light at lower frequency (e.g.0.04 Hz) directly maintained poorer buffering capacity and storage capacity of RuBP pool,which was regulated by smaller assimilatory power (NADPH and ATP) due to discontinuous electron current drive.Then,the smaller relative quantity and bigger variation rate of RuBP regeneration and consumption determined instability of photosynthetic oscillation in pulsed light.

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Last Update: 2017-07-17