OXIDATIVE ENZYME RESPONSES OF SIX CITRUS ROOTSTOCKS INFECTED WITH<i>PHOMA TRACHEIPHILA</i>(PETRI) KANTSCHAVELI AND GIKASHVILI

Uzun, Aydın; Seday, Ubeyit; Canıhoş, Ercan; Gülşen, Osman

doi:10.1017/s0014479712000464

Cited by 2 publications

(1 citation statement)

References 32 publications

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“…The Asc level differed in the roots and leaves of Eucalyptus seedlings at several stages of infection with soil-borne water mold Phytophthora cinnamomi [187]. Studies concerning the fungal disease of citrus trees caused by Phoma tracheiphila (Petri) Kantschaveli and Gikashvili revealed that APX activity was up-and downregulated depending on the type of rootstock in resistant and susceptible species, respectively [188]. Viral infection of apricot seeds resulted in decreased activity of enzymes of the ascorbate-glutathione cycle and decreased germination capacity [174].…”

Section: The Involvement Of Asc In the Response To Biotic Stressmentioning

confidence: 99%

Ascorbic Acid—The Little-Known Antioxidant in Woody Plants

et al. 2019

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Reactive oxygen species (ROS) are constantly produced by metabolically active plant cells. The concentration of ROS may determine their role, e.g., they may participate in signal transduction or cause oxidative damage to various cellular components. To ensure cellular homeostasis and minimize the negative effects of excess ROS, plant cells have evolved a complex antioxidant system, which includes ascorbic acid (AsA). AsA is a multifunctional metabolite with strong reducing properties that allows the neutralization of ROS and the reduction of molecules oxidized by ROS in cooperation with glutathione in the Foyer-Halliwell-Asada cycle. Antioxidant enzymes involved in AsA oxidation and reduction switches evolved uniquely in plants. Most experiments concerning the role of AsA have been performed on herbaceous plants. In addition to extending our understanding of this role in additional taxa, fundamental knowledge of the complex life cycle stages of woody plants, including their development and response to environmental factors, will enhance their breeding and amend their protection. Thus, the role of AsA in woody plants compared to that in nonwoody plants is the focus of this paper. The role of AsA in woody plants has been studied for nearly 20 years. Studies have demonstrated that AsA is important for the growth and development of woody plants. Substantial changes in AsA levels, as well as reduction and oxidation switches, have been reported in various physiological processes and transitions described mainly in leaves, fruits, buds, and seeds. Evidently, AsA exhibits a dual role in the photoprotection of the photosynthetic apparatus in woody plants, which are the most important scavengers of ozone. AsA is associated with proper seed production and, thus, woody plant reproduction. Similarly, an important function of AsA is described under drought, salinity, temperature, light stress, and biotic stress. This report emphasizes the involvement of AsA in the ecological advantages, such as nutrition recycling due to leaf senescence, of trees and shrubs compared to nonwoody plants.

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Section: The Involvement Of Asc In the Response To Biotic Stressmentioning

confidence: 99%