NDLI: Factors Limiting Photosynthetic Recovery in Sweet Pepper Leaves After Short-Term Chilling Stress Under Low Irradiance

Content Provider	Springer Nature Link
Author	Li, X. G. Wang, X. M. Meng, Q. W. Zou, Q.
Copyright Year	2004
Abstract	The effects of chilling treatment (4 °C) under low irradiance, LI (100 μmol m$^{−}$2 s$^{−1}$) and in the dark on subsequent recovery of photosynthesis in chilling-sensitive sweet pepper leaves were investigated by comparing the ratio of quantum yields of photosystem (PS) 2 and CO$_{2}$ assimilation, Φ$_{PS2}$/Φ$_{CO2}$, measured in normal air (21 % O$_{2}$, NA) and low O$_{2}$-air (2% O$_{2}$, LOA), and by analyzing chlorophyll (Chl) a fluorescence parameters. Chilling treatment in the dark had little effect on F$_{v}$/F$_{m}$ and Φ$_{PS2}$/Φ$_{CO2}$, but it caused the decrease of net photosynthetic rate (P $_{N}$) under saturating irradiance after 6-h chilling treatment, indicating that short-term chilling alone did not induce PS2 photoinhibition. Furthermore, photorespiration and Mehler reaction also did not obviously change during subsequent recovery after chilling stress in the dark. During chilling treatment under LI, there were obvious changes in F$_{v}$/F$_{m}$ and Φ$_{PS2}$/Φ$_{CO2}$, determined in NA or LOA. F$_{v}$/F$_{m}$ could recover fully in 4 h at 25 °C, and Φ$_{PS2}$/Φ$_{CO2}$ increased at the end of the treatment, as determined in both NA and LOA. During subsequent recovery, Φ$_{PS2}$/Φ$_{CO2}$ in LOA decreased faster than in NA. Thus the Mehler reaction might play an important role during chilling treatment under LI, and photorespiration was an important process during the subsequent recovery. The recovery of PN under saturating irradiance determined in NA and LOA took about 50 h, implying that there were some factors besides CO$_{2}$ assimilation limiting the recovery of photosynthesis. From the progress of reduced P700 and the increase of the Mehler reaction during chilling under LI we propose that active oxygen species were the factors inducing PS1 photoinhibition, which prevented the recovery of photosynthesis in optimal conditions because of the slow recovery of the oxidizable P700.
Starting Page	257
Ending Page	262
Page Count	6
File Format	PDF
ISSN	03003604
Journal	Photosynthetica
Volume Number	42
Issue Number	2
e-ISSN	15739058
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2004-01-01
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	Plant Physiology
Content Type	Text
Resource Type	Article
Subject	Physiology Plant Science

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