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Factors Affecting Tolerance to Low Night Temperature Differ by Fruit Types in Tomato

1
Vegetable Research Division, Department of Horticultural Crop Research, National Institute of Horticultural & Herbal Science, Rural Development Administration, Wanju 55365, Korea
2
Department of Environmental Horticulture, Dankook University, Cheonan 31116, Korea
*
Author to whom correspondence should be addressed.
Equal contribution.
Academic Editor: Daniel Tan
Agriculture 2021, 11(7), 681; https://doi.org/10.3390/agriculture11070681
Received: 21 June 2021 / Revised: 15 July 2021 / Accepted: 16 July 2021 / Published: 19 July 2021
Tolerance to low night temperature (LNT) can be a practical and economical target in tomato breeding programs for energy saving in greenhouses. This study was conducted to investigate the physiological and biochemical responses to LNT using four tomato accessions with cherry or large fruit types having LNT tolerance or sensitivity. The accessions were grown in two polyethylene film greenhouses with night temperature set-points of 10 and 15 °C for heating. LNT significantly reduced the plant height, and photosynthetic parameters were also lower in 10 than 15 °C among all accessions. Photosynthetic rate in 10 °C during the early growth period was reduced more in LNT-tolerant than -sensitive accessions. The numbers of flowers in 10 °C were significantly reduced in cherry but not in large fruit types. Fruit set in 10 °C significantly decreased in LNT-sensitive accessions of both fruit types, which was due to abnormal flower morphology. Proline accumulation patterns between 10 and 15 °C significantly differed between cherry and large fruit types as well as between LNT-tolerant and -sensitive accessions. Chlorophyll content at later growth stages in 10 °C was significantly higher in LNT-tolerant than -sensitive accessions in both fruit types. These results suggest that different tomato fruit types may have different mechanisms for LNT tolerance, possibly due to different proline accumulation patterns between cherry and large fruit types. View Full-Text
Keywords: tomato; low night temperature; flower; fruit; chlorophyll content; electrolyte conductivity; proline; photosynthesis tomato; low night temperature; flower; fruit; chlorophyll content; electrolyte conductivity; proline; photosynthesis
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MDPI and ACS Style

Yang, E.-Y.; Rajametov, S.N.; Cho, M.-C.; Jeong, H.-B.; Chae, W.-B. Factors Affecting Tolerance to Low Night Temperature Differ by Fruit Types in Tomato. Agriculture 2021, 11, 681. https://doi.org/10.3390/agriculture11070681

AMA Style

Yang E-Y, Rajametov SN, Cho M-C, Jeong H-B, Chae W-B. Factors Affecting Tolerance to Low Night Temperature Differ by Fruit Types in Tomato. Agriculture. 2021; 11(7):681. https://doi.org/10.3390/agriculture11070681

Chicago/Turabian Style

Yang, Eun-Young, Sherzod N. Rajametov, Myeong-Cheoul Cho, Hyo-Bong Jeong, and Won-Byoung Chae. 2021. "Factors Affecting Tolerance to Low Night Temperature Differ by Fruit Types in Tomato" Agriculture 11, no. 7: 681. https://doi.org/10.3390/agriculture11070681

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