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| Effects of Rhizoctonia solani infection onphotosystems activities of peanut leaves |
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| Abstract: |
| In order to investigate the effects of root infection of Rhizoctonia solani on photosystems activities of
peanut leaves，Chlorophyll fluorescence transient，light absorbance at 820 nm and some related physiological indexes
of peanut leaves were detected. The results showed that，5 days after peanut inoculation，the infection rate was 0%，
and 50 days after inoculation，the infection rate was 58.3%. Compared with the control，the aboveground mass of
peanut reduced by 10.5%，the belowground mass reduced by 20.0%，the net photosynthetic rate（Pn）and chlorophyll
content significantly decreased，stomatal conductance declined slowly，whereas intercellular CO2 concentration had no
significant change. Furthermore，significant increase of H2O2 and malondialdehyde content and significant decline of Fv/
Fm and PIABS were observed in infected peanut leaves. The electronic donor sides，reaction centers and acceptor sides of
PS II were significantly damaged by R. solani infection， and the acceptor side was harmed more seriously than the donor
side. Meanwhile，the PS I activity was also damaged severely. R. solani infection resulted in an increase of H2O2，which
damaged the photosystem functions and hindered the electronic transferring from PS II to PS I. Accumulation of excessive
excitation energy led to an increase of reactive oxygen species，which damaged photosystems further and then inhibited
the photosynthesis in peanuts，thus reduced their biomass |
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