Hormonal Regulation in Different Varieties of Chenopodium quinoa Willd. Exposed to Short Acute UV-B Irradiation

Lorenzo Mariotti, Thais Huarancca Reyes, Jose Martin Ramos-Diaz, Kirsi Jouppila, Lorenzo Guglielminetti

Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review


Increased ultraviolet-B (UV-B) due to global change can affect plant development and
metabolism. Quinoa tolerates extreme conditions including high UV levels. However, the physiological
mechanisms behind its abiotic stress tolerance are unclear, especially those related to UV-B.
We previously demonstrated that 9.12 kJ m−2 d−1 may induce UV-B-specific signaling while 18.24 kJ
m−2 d−1 promotes a UV-B-independent response. Here, we explored the effects of these UV-B doses
on hormonal regulation linked to plant morphology and defense among diverse varieties. Changes
in fluorescence parameters of photosystem II, flavonoids and hormones (indoleacetic acid (IAA),
jasmonic acid (JA), abscisic acid (ABA) and salicylic acid (SA)) were surveyed under controlled conditions.
Here, we showed that the sensitivity to short acute UV-B doses in varieties from different
habitats is influenced by their parental lines and breeding time. UV-B sensitivity does not necessarily
correlate with quinoa’s geographical distribution. The role of flavonoids in the UV-B response
seems to be different depending on varieties. Moreover, we found that the extent of changes in JA
and SA correlate with UV-B tolerance, while the increase of ABA was mainly related to UV-B stress.
Antal sidor14
StatusPublicerad - 23 apr 2021
MoE-publikationstypA1 Tidskriftsartikel-refererad


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