Naslov
Biochemical and physiological responses to long-term Citrus tristeza virus infection in Mexican lime plants

Autori
Hančević, Katarina ; Radić, Tomislav ; Pasković, Igor ; Urlić, Branimir

Izvornik
Plant pathology (0032-0862) 67 (2018), 4; 987-994

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
CTV ; Biotic stress ; Host response

Sažetak
Reactions that occur when the plant is subjected to Citrus tristeza virus (CTV) infection often result in triggering numerous defence mechanisms to fight the infection. The reactions vary regarding virus strain, host genotype, time exposure to the infection and environmental conditions. No study has examined, to date and in detail, the consequence of ten-year exposure to CTV infection on biochemical and physiological status of susceptible Mexican lime plants (Citrus aurantifolia). To understand such kind of infection changes in nutrient status, total proteins, enzyme activity involved in scavenging stressed condition, photosynthetic and transpiration rates, chlorophyll content, membrane permeability and water content were analysed between different CTV strains and healthy plants. The activity of superoxide dismutase and polyphenol oxidase significantly decreased in the infected leaves, as well as membrane permeability which were lower in the infected plants. Macro- and micro-nutrient elements were significantly changed: concentrations of leaf nitrogen, zinc, magnesium and iron were elevated but potassium concentration depressed in relation to non-infected control leaves. No changes were found with other analysed nutrient elements, enzymes, photosynthesis and stomatal conductance, chlorophyll content and relative water content. As shown in this study clear physiological changes were found among infected and non-infected control plants but none between different CTV strains. Data suggests that some of the defence mechanism investigated here were supressed due to the continuous and long-term pressure of biotic stress.

Izvorni jezik
Engleski

Znanstvena područja
Biologija, Poljoprivreda (agronomija)

POVEZANOST RADA