Photosynthetica 2010, 48(1):110-116 | DOI: 10.1007/s11099-010-0015-6
Photoprotective mechanisms in cold-acclimated and nonacclimated needles of Picea glehnii
- 1 Cryosphere Science Research Section, Institute of Low Temp. Science, Hokkaido Univ. Sapporo, Sapporo, Japan
- 2 Plant Ecophysiology Lab., Department of Biology, Kyungpook National Univ., Daegu, Korea
The response of Picea glehnii, a cold-tolerant species in the boreal zone, to air temperature (T) was investigated for its cold-acclimated needles (i.e. the ones subjected to gradual decrease in T) and nonacclimated needles (i.e. the ones subjected to a sudden decrease in T) were compared under low temperature. Cold-acclimated needles showed a greater increase of zeaxanthin and lutein contents than nonacclimated ones, whereas the nonacclimated needles showed a greater increase of thylakoid-bound ascorbate peroxidase (tAPX) activity than cold-acclimated ones under chilling conditions (after cold acclimation). These results suggest that: (1) low T induces the increase of zeaxanthin and lutein content, and tAPX activity; (2) accumulated zeaxanthin and lutein protect needles from photooxidative stress by dissipating excess energy before the reactive oxygen species (ROS) are formed in response to a gradual decrease in T (with cold acclimation and subsequent chilling condition), and by tAPX scavenging ROS formed in the case of a sudden decrease in T (without cold acclimation and chilling condition).
Additional key words: ascorbate peroxidase; low temperature; lutein; photoprotective mechanisms; Picea glehnii; zeaxanthin
Received: August 17, 2009; Accepted: January 29, 2010; Published: March 1, 2010 Show citation
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