The role of cryptochrome 1a in long-distance signaling of water deficit in tomato

• Ano de defesa: 2020
• Autor(a) principal: Damião, Victor D’Amico [UNESP]
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: eng
• Instituição de defesa: Universidade Estadual Paulista (Unesp)
• Palavras-chave em Português: Blue-light fluence; Cryptochrome 1a; Osmotic stress; Root-shoot signaling; Solanum lycopersicum L.; Water deficit
• Link de acesso: http://hdl.handle.net/11449/194336

It is well known that light is a crucial environmental factor that has a fundamental role in plant growth and development from seed germination to fruiting. For this process, plants contain versatile and multifaceted photoreceptor systems to sense variations in the light spectrum and to acclimate to a range of ambient conditions. Five main groups of photoreceptors have been found in higher plants, cryptochromes, phototropins, UVR8, zeitlupes and phytochromes, but the last one red/far red wavelengths photoreceptor is the most characterized. Among the many responses modulated by phytochromes, these molecules play an important role in biotic and abiotic stress responses, which is one of the most active research topics in plant biology, especially their effect on agronomic traits. However, regarding the light spectrum, it is not surprising to consider that other photoreceptors are also part of the stress response modulated by light. In fact, it has become increasingly evident that cryptochromes, which mainly absorb in the blue light region, also act as key regulators of a range of plant stress responses, such as drought, salinity, heat and high radiation. However, this information is rarely evidenced in photomorphogenetic studies. Therefore, the scope of the charpter 1 is (i) to compile and discuss the evidence on the abiotic stress responses in plants that are modulated by cryptochromes. In addition, chapters 2, 3 and 4 refer to the respective manuscripts: (ii) physiological characterization of the tomato cry1a mutant; (iii) characterization of tomato cry1a mutant seedlings under osmotic stress and different rates of blue light fluencies; and (iv) the study of plant water stress responses using the photomorphogenetic mutant cry1a and grafting to understand the role of this photoreceptor in long-distance signaling.