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Melatonin imparts tolerance to combined drought and high-temperature stresses in tomato through osmotic adjustment and ABA accumulation

dc.contributor.authorAnnadurai K. Mumithrakamatchi
dc.contributor.authorSenthil Alagarswamy
dc.contributor.authorKuppusamy Anitha
dc.contributor.authorMaduraimuthu Djanaguiraman
dc.contributor.authorM. Karuppasami Kalarani
dc.contributor.authorRamakrishnan Swarnapriya
dc.contributor.authorSubramanian Marimuthu
dc.contributor.authorSampathrajan Vellaikumar
dc.contributor.authorSelvaraju Kanagarajan
dc.contributor.authorSelvaraju Kanagarajan
dc.contributor.otherDepartment of Crop Physiology, Tamil Nadu Agricultural University (TNAU), Coimbatore, India
dc.contributor.otherDepartment of Crop Physiology, Tamil Nadu Agricultural University (TNAU), Coimbatore, India
dc.contributor.otherDepartment of Crop Physiology, Tamil Nadu Agricultural University (TNAU), Coimbatore, India
dc.contributor.otherDepartment of Crop Physiology, Tamil Nadu Agricultural University (TNAU), Coimbatore, India
dc.contributor.otherDirectorate of Crop Management, Tamil Nadu Agricultural University, Coimbatore, India
dc.contributor.otherFloriculture Research Station, Thovalai, India
dc.contributor.otherDepartment of Agronomy, Agricultural College and Research Institute (AC&RI), Eachangkottai, Thanjavur, India
dc.contributor.otherCentre for Plant Molecular Biology and Biotechnology, Tamil Nadu Agricultural University, Coimbatore, India
dc.contributor.otherDepartment of Plant Breeding, Swedish University of Agricultural Sciences, Lomma, Sweden
dc.contributor.otherSchool of Science and Technology, The Life Science Centre, Örebro University, Örebro, Sweden
dc.date.accessioned2025-10-09T05:32:05Z
dc.date.available2025-10-09T05:32:05Z
dc.date.issued01-03-2024
dc.identifier.urihttps://www.frontiersin.org/articles/10.3389/fpls.2024.1382914/full
dc.identifier.urihttp://digilib.fisipol.ugm.ac.id/repo/handle/15717717/41136
dc.description.abstractIn recent years, environmental stresses viz., drought and high-temperature negatively impacts the tomato growth, yield and quality. The effects of combined drought and high-temperature (HT) stresses during the flowering stage were investigated. The main objective was to assess the effects of foliar spray of melatonin under both individual and combined drought and HT stresses at the flowering stage. Drought stress was imposed by withholding irrigation, whereas HT stress was imposed by exposing the plants to an ambient temperature (AT)+5°C temperature. The drought+HT stress was imposed by exposing the plants to drought first, followed by exposure to AT+5°C temperature. The duration of individual and combined drought or HT stress was 10 days. The results showed that drought+HT stress had a significant negative effect compared with individual drought or HT stress alone. However, spraying 100 µM melatonin on the plants challenged with individual or combined drought and HT stress showed a significant increase in total chlorophyll content [drought: 16%, HT: 14%, and drought+HT: 11%], Fv/Fm [drought: 16%, HT: 15%, and drought+HT: 13%], relative water content [drought: 10%, HT: 2%, and drought+HT: 8%], and proline [drought: 26%, HT: 17%, and drought+HT: 14%] compared with their respective stress control. Additionally, melatonin positively influenced the stomatal and trichome characteristics compared with stress control plants. Also, the osmotic adjustment was found to be significantly increased in the melatonin-sprayed plants, which, in turn, resulted in an increased number of fruits, fruit set percentage, and fruit yield. Moreover, melatonin spray also enhanced the quality of fruits through increased lycopene content, carotenoid content, titratable acidity, and ascorbic acid content, compared with the stress control. Overall, this study highlights the usefulness of melatonin in effectively mitigating the negative effects of drought, HT, and drought+HT stress, thus leading to an increased drought and HT stress tolerance in tomato.
dc.language.isoEN
dc.publisherFrontiers Media S.A.
dc.subject.lccPlant culture
dc.titleMelatonin imparts tolerance to combined drought and high-temperature stresses in tomato through osmotic adjustment and ABA accumulation
dc.typeArticle
dc.description.keywordsmelatonin
dc.description.keywordsdrought
dc.description.keywordshigh-temperature
dc.description.keywordsstomata
dc.description.keywordsproline
dc.description.keywordsabscisic acid
dc.description.doi10.3389/fpls.2024.1382914
dc.title.journalFrontiers in Plant Science
dc.identifier.e-issn1664-462X
dc.identifier.oaioai:doaj.org/journal:635ffb6707744a599241e3b2abc32639


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