Photosynthetica, 2016 (vol. 54), issue 3

Photosynthetica 2016, 54(3):475-477 | DOI: 10.1007/s11099-016-0202-1

Effect of day/night temperature difference on chlorophyll content, photosynthesis and fluorescence parameters of tomato at fruit stage

X. K. Yuan1,*
1 Hunan Institute of Meteorological Science, Changsha, China

In order to investigate the effect of day/night temperature difference (DIF) on photosynthetic characteristics of tomato plants (Solanum lycopersicum, cv. Jinguan 5) at fruit stage, an experiment was carried out in climate chambers. Five day/night temperature regimes (16/34, 19/31, 25/25, 31/19, and 34/16°C) with respective DIFs of -18, -12, 0, +12, and +18 were used and measured at mean daily temperature of 25°C. The results showed that chlorophyll (Chl) a, Chl b, net photosynthetic rate (P N), stomatal conductance (gs), maximum quantum yield of PSII photochemistry (Fv/Fm), effective quantum yield of PSII photochemistry (ϕPSII), and photochemical quenching (qp) significantly increased under positive DIF, while they decreased with negative DIF. In contrast, the Chl a/b ratio and nonphotochemical quenching (NPQ) decreased under positive DIF, while increased with negative DIF. Chl a, Chl b, P N, gs, Fv/Fm, ϕPSII, and qp were larger under +12 DIF than those at +18 DIF, while Chl a/b and NPQ showed an opposite trend.

Keywords: nonstomatal limitation; photosynthetic efficiency

Received: October 14, 2015; Accepted: January 14, 2016; Published: September 1, 2016Show citation

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Yuan, X.K. (2016). Effect of day/night temperature difference on chlorophyll content, photosynthesis and fluorescence parameters of tomato at fruit stage. Photosynthetica, 54(3), 475-477. doi: 10.1007/s11099-016-0202-1.
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