Physiological traits associated with high temperature tolerance differ by fruit types and sizes in tomato ( Solanum lyco
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RESEARCH REPORT
Physiological traits associated with high temperature tolerance differ by fruit types and sizes in tomato (Solanum lycopersicum L.) Rajametov Sherzod1 · Eun Young Yang1 · Myeong Cheoul Cho1 · Soo Young Chae1 · Won Byoung Chae2 Received: 2 March 2020 / Revised: 17 May 2020 / Accepted: 3 August 2020 © Korean Society for Horticultural Science 2020
Abstract Plants are very sensitive to environmental stresses, particularly to high temperature (HT) which is predicted to increase. This study was conducted to investigate the response to HT for identifying physiological traits associated with HT tolerance in tomato. Thirty-eight tomato accessions with three fruit sizes (cherry, medium and large) were grown in greenhouses where temperature set-point for ventilation was 25 °C and 40 °C for normal temperature (NT) and HT, respectively. HT increases plant height and stem diameter but little effect on leaf length and width. For reproductive traits, HT has positive effect on the number of flowers (NFL) but negative on the number of fruits (NFR), fruit set (FS), weight (FW) and yield (FY), and pollen germination (PG) and tube length. In the correlation analysis, except for accession T37 with extreme value causing spurious results, PG did not show significant correlation with FS, FW and FY, but with NFL and NFR in HT condition. NFR (HT), FS (HT) and FY (NT) are identified as physiological traits associated with HT tolerance based on correlation with FY (HT). However, their association to HT tolerance differ by fruit sizes. NFR (HT) was significantly correlated with FY (HT) in sub-population of cherry (r = 0.859**, n = 14), medium (r = 0.848**, n = 7) and large fruit types (r = 0.769**, n = 16) but not in total population (r = 0.302NS, n = 37). FS (HT) and, interestingly, FY (NT) were significantly correlated with fruit yield (HT) in total population and a cherry fruit sub-population but not in medium and large fruit sub-population. Results suggest that physiological traits associated with HT tolerance differ by fruit size and breeding programs should consider different selection criteria for different fruit types when develop cultivars with HT tolerance. Keywords Fruit yield · Pollen germination · Pollen tube length · Reproductive traits · Vegetative traits
1 Introduction
Communicated by Sung-Chur Sim. Rajametov Sherzod and Eun Young Yang have contributed equally to this work. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s13580-020-00280-4) contains supplementary material, which is available to authorized users. * Won Byoung Chae [email protected] 1
National Institute of Horticultural and Herbal Science, Rural Development Administration, Wanju 55365, Republic of Korea
Department of Environmental Horticulture, Dankook University, Cheonan 31116, Republic of Korea
2
Climate change, especially increase in average temperature and abnormal weather, can have potential impacts on agriculture production and food security throughout the world (Boote et a
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