Physiological Traits of Thirty-Five Tomato Accessions in Response to Low Temperature

Sherzod Nigmatullayevich Rajametov, Kwanuk Lee, Hyo-Bong Jeong, Myeong-Cheoul Cho, Chun-Woo Nam and Eun-Young Yang
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Sherzod Nigmatullayevich Rajametov: National Institute of Horticultural & Herbal Science, Rural Development Administration, Wanju 55365, Korea
Kwanuk Lee: National Institute of Horticultural & Herbal Science, Rural Development Administration, Wanju 55365, Korea
Hyo-Bong Jeong: National Institute of Horticultural & Herbal Science, Rural Development Administration, Wanju 55365, Korea
Myeong-Cheoul Cho: National Institute of Horticultural & Herbal Science, Rural Development Administration, Wanju 55365, Korea
Chun-Woo Nam: National Institute of Horticultural & Herbal Science, Rural Development Administration, Wanju 55365, Korea
Eun-Young Yang: National Institute of Horticultural & Herbal Science, Rural Development Administration, Wanju 55365, Korea

Agriculture, 2021, vol. 11, issue 8, 1-13

Abstract: Tomato is often exposed to diverse abiotic stresses and cold stress is one of harsh environmental stresses. Abnormal low temperature affects tomato growth and development, leading to, e.g., physiological disorders, flower drops, and abnormal fruit morphology, and causing a decrease in tomato yield and fruit quality. It is important to identify low temperature-(LT) tolerant tomato ( Solanum lycopersicum L.) cultivars relying on different fruit types. In this study, our focus was to analyze the physiological traits of 35 tomato accessions with three different fruit types (cherry, medium, and large sizes) under night temperature set-points of 15 °C for control temperature (CT) and 10 °C for LT, respectively. Plant heights (PH) of most tomato accessions in LT were remarkably decreased compared to those in CT. The leaf length (LL) and leaf width (LW) were reduced depending on the genotypes under LT. In addition, the number of fruits (NFR), fruit set (FS), fruit yield (FY), and marketable yield (MY) were negatively affected in LT. The variation was further investigated by the correlation, the principal component (PCA), and the cluster analysis. Interestingly, positive correlations between different vegetative and reproductive traits were uncovered. Multivariate analysis including the PCA and hierarchical clustering classified the LT-treated 35 tomato accessions into four major groups. The identified accessions were associated with vegetative and reproductive parameters on positive directions. The results might be utilized for establishing breeding programs on selecting LT-tolerant tomato cultivars with different selection indices relying on fruit types during vegetative and/or reproductive stages.

Keywords: tomatoes; cold stress; fruit types; tomato breeding; principal component analysis; cluster analysis (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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