Biologia plantarum 55:793, 2011 | DOI: 10.1007/s10535-011-0190-8

Hexanoic acid 2-(diethylamino)ethyl ester enhances chilling tolerance in strawberry seedlings by impact on photosynthesis and antioxidants

X. -J. Fu1, A. S. Maimaiti1, H. -M. Mou1, Q. Yang1, G. -J. Liu1,*
1 College of Agriculture and Biotechnology, China Agricultural University, Beijing, P.R. China

Strawberry (Fragaria ananassa Duch.) seedlings were pretreated with hexanoic acid 2-(diethylamino)ethyl ester (DA-6) in concentrations of 0, 10, 20 and 40 mg dm-3 and then subjected to chilling and rewarming. The effects of applied DA-6 on the generation of reactive oxygen species (O2 -, H2O2), lipid peroxidation, proline accumulation and photosynthesis were evaluated. Pretreatment with DA-6 alleviated the inhibition of superoxide dismutase (SOD), catalase (CAT) and ascorbate peroxidase (APX) activities caused by chilling stress thus reducing O2 - and H2O2 production and lipid peroxidation in pretreated plants. DA-6 pretreatment also accelerated accumulation of proline and reduce the decrease in proline content after rewarming. DA-6 pretreatment increases maximum quantum yield of photosystem 2 (Fv/Fm), actual photochemical efficiency of photosystem 2 (ΦPS2), photochemical quenching coefficient (qP) and net photosynthetic rate (PN) and decreases non-photochemical quenching coefficient (qNP) of the seedlings under chilling stress. DA-6 pretreatment also increased the recovery rate of photosynthesis after rewarming.

Keywords: ascorbate peroxidase; catalase; chlorophyll fluorescence; Fragaria ananassa; net photosynthetic rate; superoxide dismutase.

Received: September 18, 2010; Accepted: January 13, 2011; Published: December 1, 2011Show citation

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Fu, X.-J., Maimaiti, A.S., Mou, H.-M., Yang, Q., & Liu, G.-J. (2011). Hexanoic acid 2-(diethylamino)ethyl ester enhances chilling tolerance in strawberry seedlings by impact on photosynthesis and antioxidants. Biologia plantarum, 55(4), 793. doi: 10.1007/s10535-011-0190-8.
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