Photochemical responses to abrupt and gradual chilling treatments in eucalyptus species

Author(s)

Schimpl, Flavia Camila ^[1] ; Ribeiro, Rafael Vasconcelos ^[1] ; Pereira, Luciano ^[1] ; Rodrigues, Haroldo Silva ^[2] ; Mazzafera, Paulo ^{[1, 3]}

Affiliation

^[1] Univ Estadual Campinas, UNICAMP, Dept Plant Biol, Inst Biol, CP 6109, BR-13083970 Campinas, SP - Brazil

^[2] Univ Fed Vicosa, Dept Plant Sci, BR-36570000 Vicosa, MG - Brazil

^[3] Univ Sao Paulo, Escola Super Agr Luiz de Queiroz, Dept Crop Sci, BR-13418900 Piracicaba, SP - Brazil

• Document type: Journal article
• Source: THEORETICAL AND EXPERIMENTAL PLANT PHYSIOLOGY; v. 30, n. 1, p. 9-17, MAR 2018.
• Web of Science Citations: 0

Abstract

Eucalyptus plant is one of the most economic important forest species explored worldwide and in some countries its cultivation is expanding to regions with lower temperatures, including Brazil. This study aimed to compare the photochemical response of 18 Eucalyptus species, one Corimbia and one hybrid subjected to low temperature using two chilling treatments. Six-month-old plants were exposed to (1) gradual chilling (20-0 degrees C in four steps of 5 degrees C for 10 min) and abrupt chilling (20-5 degrees C in one step). Based on chlorophyll fluorescence parameters, eucalyptus species responded differently depending on how chilling was applied. E. tereticornis presented the best performance under chilling, regardless how it was imposed. The effective quantum yield of photosystem II was the best parameter to identify variation in photochemical responses of eucalyptus species to chilling. It was also observed that E. brassiana, C. citriodora, E. grandis, E. gunni, and E. resinifera were sensitive to the way chilling was applied, leading to differential photochemical response. (AU)

• FAPESP's process: 14/23541-0 - Identification of CBF transcription factors in eucalyptus and evaluation of their potential against abiotic stresses
• Grantee: Paulo Mazzafera
• Support type: Regular Research Grants