Plant and Cell Physiology Advance Access published online on February 5, 2008
Plant and Cell Physiology, doi:10.1093/pcp/pcn020
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The Chilling Injury Induced by High Root Temperature in the Leaves of Rice Seedlings
Climate Change Research Team, Tohoku National Agricultural Research Center, Shimo-Kuriyagawa, Morioka, Iwate 020-0198, Japan
Corresponding author: Kensaku Suzuki. Climate Change Research Team, Tohoku National Agricultural Research Center, Shimo-Kuriyagawa, Morioka, Iwate 020-0198, Japan. Phone: +81-(0)19-643-3462, Fax: +81-(0)19-641-7794, E-mail: suzuki{at}affrc.go.jp
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Abstract |
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Root temperature is found to be a very important factor for leaves to alter the response and susceptibility to chilling stress. The severe visible damage was observed in the most active leaves of seedlings of a japonica rice (Oryza sativa cv. Akitakomachi), e.g. the third leaf at the third leaf-stage, after the treatment where only leaves but not roots were chilled (L/H). On the other hand, no visible damage was observed, after the treatment where both leaves and roots were chilled simultaneously (L/L). The chilling injury induced by L/H, a novel type of chilling injury, required the light either during or after the chilling to develop the visible symptoms such as leaf bleaching and tissue necrosis. Chlorophyll fluorescence parameters measured after various length of chilling treatments showed the significant changes before the visible injury induced. The effective quantum yield and photochemical quenching of the photosystem II (PSII) dropped dramatically within 24 h both in the presence and absence of 12 h-light period. The maximal quantum yield and non-photochemical quenching of the PSII decreased significantly only in the presence of light. On the other hand, L/H chilling did not affect the function of photosystem I (PSI), but caused a significant decrease in the electron availability for PSI. These results suggest that the leaf chilling with high root temperature destroys some component between PSII and I without the aid of light, which causes the over-reduction of PSII in the light, thereby the visible injury is induced only in the light.
Keywords: chilling injury - electron transport - photosystem - rice seedlings - root temperature - water
(Received January 5, 2008; Accepted February 1, 2008)
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