Increased ultraviolet-B (UV-B) radiation due to global change can affect the development and metabolism of plants. Quinoa (Chenopodium quinoa Willd.) is a grain crop with worldwide interest due to its high protein and well-balanced amino acid content. Moreover, it has been reported that quinoa can grow under high salinity levels, drought and high UV radiation. However, the physiological mechanisms behind its abiotic stress tolerance are still unclear, especially those related to UV-B response. Our recent study revealed that quinoa regulates different mechanisms of response depending on the UV-B irradiation dosage, in which 3 days of 3.04 kJ m-2 d-1 UV-B induces UV-B-specific signaling to counteract reactive oxygen species and photosystem II damage, while 6.08 kJ m-2 d-1 UV-B may promote UV-B-independent response by the induction of pathogen-defense/wound-signaling pathways (Huarancca Reyes et al., 2018). Here, we attempt to characterize in more detail the mechanisms of quinoa in response to different UV-B doses which are still unclear. It is known that UV-B controls plant hormones and consequently plant morphology and defense. In this line, we analyzed the hormonal balance of different quinoa varieties in response to short acute UV-B treatments under controlled conditions, and the results will be discussed.
Effects of UV-B on hormonal balance in Chenopodium quinoa
Thais Huarancca Reyes;Lorenzo Mariotti;Lorenzo Guglielminetti
2018-01-01
Abstract
Increased ultraviolet-B (UV-B) radiation due to global change can affect the development and metabolism of plants. Quinoa (Chenopodium quinoa Willd.) is a grain crop with worldwide interest due to its high protein and well-balanced amino acid content. Moreover, it has been reported that quinoa can grow under high salinity levels, drought and high UV radiation. However, the physiological mechanisms behind its abiotic stress tolerance are still unclear, especially those related to UV-B response. Our recent study revealed that quinoa regulates different mechanisms of response depending on the UV-B irradiation dosage, in which 3 days of 3.04 kJ m-2 d-1 UV-B induces UV-B-specific signaling to counteract reactive oxygen species and photosystem II damage, while 6.08 kJ m-2 d-1 UV-B may promote UV-B-independent response by the induction of pathogen-defense/wound-signaling pathways (Huarancca Reyes et al., 2018). Here, we attempt to characterize in more detail the mechanisms of quinoa in response to different UV-B doses which are still unclear. It is known that UV-B controls plant hormones and consequently plant morphology and defense. In this line, we analyzed the hormonal balance of different quinoa varieties in response to short acute UV-B treatments under controlled conditions, and the results will be discussed.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
