Photosynthesis and photoinhibition after night chilling in seedlings of two tropical tree species grown under three irradiances
Feng, Y.L.(Chinese Academy of Sciences, Kunming (China). Xishuangbanna Tropical Botanical Garden)E-mail:[email protected] | Cao, K.F.(Hebei Univ., Baoding (China). Coll. of Life Sciences)
Seedlings of Calophyllum polyanthum and Linociera insignis grown under 8, 25, and 50% daylight for 5 months were moved to a 4-6 deg C cold storage house for three nights and returned to the original shaded sites during the day. The night chilling (CN) resulted in strong suppression of photosynthesis and stomatal conductance for L. insignis. In both species, it reduced photorespiration rates, carboxylation efficiency, and maximum photochemical efficiency of photosystem 2 (PS2) at dawn and midday, increased the rates of non-photochemical quenching and the contents of malondialdehyde and H2O2. Its impacts increased with the number of CN. After 3-d-recovery, gas exchange and fluorescence parameters returned to pre-treatment levels. Thus CN induced mainly stomatal limitation of photosynthesis for L. insignis and non-stomatal limitation for C. polyanthum. C. polyanthum was more susceptible to CN than L. insignis.
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