Jasmonic acid, polyamine, and antioxidant levels in apple seedlings as affected by Ultraviolet-C irradiation

Abstract

The effect of UV-C irradiation on jasmonates, abscisic acid (ABA), polyamines and antioxidant activities was investigated in apple plants (Malus domestica Borkh.). The EC 50 values of O 2 --scavenging activity in the UV-C treated leaves were lower than those in the untreated control. In addition, total ascorbic acid and polyphenolic concentrations in the UV-C treated leaves were generally higher than those in the untreated control. Although the endogenous ABA concentrations were not significantly different between the untreated control and UV-C treatment, the endogenous jasmonic acid, putrescine, and spermine concentrations in the UV-C treated plants were higher than those in the untreated control. However, the application of PDJ before UV treatment inhibited the rise of endogenous jasmonate and putrescine concentrations. The increase of ascorbic acid was also inhibited by PDJ application before UV treatment. These facts suggest that the increase of jasmonates and polyamines may be associated with UV-C stimulation, and UV-C irradiation may be effective for increasing antioxidant activity in apple leaves.

Dealing with abiotic stresses: an integrative view of how phytohormones control abiotic stress-induced oxidative stress

“…For example, in Hordeum vulgare JA was shown to act as a mediator in plant defense through the induction of SOD and POD activities after UV-B treatment (Fedina et al 2009). In accordance with this, UV-C treated leaves of Malus domestica exhibited increased JA and polyamines contents, well-known effective antioxidants (Kondo et al 2011). However, the hormonal control of antioxidants profile induced by UV-B seems to be complex since virtually all other hormones can be involved in this response, such as Et and ABA, which were shown to control polyamines accumulation, as observed in Arabidopsis rosettes (Rakitin et al 2009).…”

Transcriptomic Analysis of Grape (Vitis vinifera L.) Leaves after Exposure to Ultraviolet C Irradiation

“…UV-C radiation decreased soluble carbohydrates, reducing sugar, chlorophyll, and proline concentrations and increasing the concentrations of UV-absorbing pigments, soluble proteins, and glucosinolate in canola leaves ( Brassica napus L.) [17] . It increased jasmonate and polyamine concentrations in leaves of apple seedlings and scoparone content in citrus leaves [10] , [18] . The production of these compounds is associated with other inducible defenses, such as cell wall modification, defense enzymes, and antioxidant activity.…”

Jasmonoyl-l-isoleucine is required for the production of a flavonoid phytoalexin but not diterpenoid phytoalexins in ultraviolet-irradiated rice leaves

“…UV-irradiation induces JA and JA-Ile biosynthesis in rice leaves JA biosynthesis is induced by UV-irradiation in several plant species, such as Arabidopsis, tomato, and apple. [13][14][15] However, the induction of jasmonate biosynthesis by UV-irradiation in rice has not been confirmed. Therefore, we first measured the levels of JA and JA-Ile in UV-irradiated wild-type (WT) rice (Oryza sativa L. 'Nihonmasari') leaves.…”

“…Jasmonates were reported to mediate UV-induced defense responses in plants. [13][14][15] However, it has been also reported that not only jasmonate-dependent, but also jasmonate-independent pathways mediate UV-induced phenolic compound accumulation in Nicotiana attenuata. 24) Notably, cpm2 exhibited greater accumulation of phytocassanes and momilactones than observed in the WT (Fig.…”