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Article

Heat Treatment in Two Tomato Cultivars: A Study of the Effect on Physiological and Growth Recovery

1
Vegetable Research Division, Department of Horticultural Crop Research, National Institute of Horticultural & Herbal Science, Rural Development Administration, Wanju 55365, Korea
2
Department of Applied Plant Science, Kangwon National University, Chuncheon 24341, Korea
*
Author to whom correspondence should be addressed.
Equal contribution.
Academic Editor: Mohammad Zahirul Islam
Horticulturae 2021, 7(5), 119; https://doi.org/10.3390/horticulturae7050119
Received: 15 March 2021 / Revised: 18 May 2021 / Accepted: 18 May 2021 / Published: 20 May 2021
(This article belongs to the Special Issue Factors Affecting the Quality and Shelf Life of Horticultural Crops)
High temperature (HT) significantly affects crop physiological traits and reduces productivity in plants. To increase yields as well as survival of crops under HT, developing heat-tolerant plants is one of the main targets in crop breeding programs. The present study attempted to investigate the linkage of the heat tolerance between the seedling and reproductive growth stages of tomato cultivars ’Dafnis‘ and ’Minichal.’ This research was undertaken to evaluate heat tolerance under two experimental designs such as screening at seedling stage and screening from reproductive traits in greenhouses. Survival rate and physiological responses in seedlings of tomatoes with 4-5 true leaves were estimated under HT (40 °C, RH 70%, day/night, respectively) and under two control and HT greenhouse conditions (day time 28 °C and 40 °C, respectively). Heat stress significantly affected physiological–chemical (photosynthesis, electrolyte conductivity, proline) and vegetative parameters (plant height, shoot fresh weight, root fresh weight) in all tomato seedlings. The findings revealed that regardless of tomato cultivars the photosynthesis, chlorophyll, total proline and electrical conductivity parameters were varied in seedlings during the heat stress period. The heat tolerance rate of tomatoes in the seedling stage might not always be associated with reproductive parameters. HT reduced fruit parameters such as fruit weight (31.9%), fruit length (14.1%), fruit diameter (19.1%), and fruit hardness (9.1%) compared to NT under HT in heat-susceptible tomato cultivar ‘Dafnis’, while in heat-tolerant cultivar ‘Minichal’ fruit length (7.1%) and fruit diameter (12.1%) was decreased by the effects of HT, but on the contrary fruit weight (3.6%) and fruit hardness (8.3%) were increased. In conclusion, screening and selection for tomatoes should be evaluated at the vegetative and reproductive stages with consideration of reproductive parameters. View Full-Text
Keywords: tomato; high temperature; damage; seedling; root; weight; flower; fruit; photosynthesis; proline; electrolyte conductivity tomato; high temperature; damage; seedling; root; weight; flower; fruit; photosynthesis; proline; electrolyte conductivity
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MDPI and ACS Style

Rajametov, S.N.; Yang, E.Y.; Jeong, H.B.; Cho, M.C.; Chae, S.Y.; Paudel, N. Heat Treatment in Two Tomato Cultivars: A Study of the Effect on Physiological and Growth Recovery. Horticulturae 2021, 7, 119. https://doi.org/10.3390/horticulturae7050119

AMA Style

Rajametov SN, Yang EY, Jeong HB, Cho MC, Chae SY, Paudel N. Heat Treatment in Two Tomato Cultivars: A Study of the Effect on Physiological and Growth Recovery. Horticulturae. 2021; 7(5):119. https://doi.org/10.3390/horticulturae7050119

Chicago/Turabian Style

Rajametov, Sherzod N., Eun Y. Yang, Hyo B. Jeong, Myeong C. Cho, Soo Y. Chae, and Niroj Paudel. 2021. "Heat Treatment in Two Tomato Cultivars: A Study of the Effect on Physiological and Growth Recovery" Horticulturae 7, no. 5: 119. https://doi.org/10.3390/horticulturae7050119

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