Effect of Day and Night Temperature Difference on Fruit Quality of Tomato and its Simulation Models

doi:10.3969/j.issn.1000-6362.2017.06.003

Abstract

Abstract: In order to investigate the effect of difference between day and night temperature (DIF) on fruit quality of tomato during fruit stage and establish stimulation model for influence of DIF on fruit quality, three experiments were conducted in Jinguan 5 plants after setting fruit in climate chambers. Five day/night temperature regimes 16℃/34℃, 19℃/31℃, 25℃/25℃, 31℃/19℃ and 34℃/16℃ with respective DIF of -18℃, -12℃, 0℃, +12℃ and +18℃ at a common 25℃ mean daily temperature were used. The fruit quality indices under all DIF treatments were determined. The results showed that fruit quality of tomato was promoted under positive DIF, while inhibited under negative DIF. The soluble sugar content, sugar to acid ratio, soluble protein content, vitamin C were increased under positive DIF, while decreased under negative DIF. They were larger under +12℃ DIF than that of +18℃ DIF. On the contrary, organic acid was decreased under positive DIF but increased under positive negative DIF. Lycopene content was increased under +12℃ DIF, but decreased under +18℃ DIF and negative DIF. Under different DIF, the relationship between fruit quality indexes such as soluble sugar, soluble protein, and thermal effectiveness and PAR (TEP) were in Logistic model. By fitting the numerical relationship between DIF and Logistic model parameters, the simulation models of the impact of DIF on soluble sugar, sucrose, soluble protein content of tomato fruit were established. The relationship between fruit quality indices such as organic acid and vitamin C and TEP were in quadratic polynomial model. By fitting the numerical relationship between DIF and quadratic polynomial model parameters, the simulation models of the impact of DIF on organic acid and vitamin C content of tomato fruit were established. The simulation effect of the models proved to be good by independent experiment data.

Key words: Day and night temperature difference, Tomato, Fruit quality, Thermal effectiveness and PAR, Simulation

YUAN Xiao-kang, YANG Zai-qiang. Effect of Day and Night Temperature Difference on Fruit Quality of Tomato and its Simulation Models[J]. Chinese Journal of Agrometeorology, 2017, 38(06): 353-360.

References

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