Nitrogen modulates the ozone response of Mediterranean wheat: Considerations for ozone risk assessment.

The experiment was conducted in an Open Top Chamber facility located in the Mediterranean basin to investigate how nitrogen (N) fertilization affects the response of wheat to ozone (O) exposure. The study considered the response of Artur Nick, a modern wheat cultivar commonly used in the area, to three O exposure levels (ambient and elevated ambient, +20 and +40 nL L O), and two N fertilization doses (100 and 200 kg ha). Measurements included leaf gas exchange, leaf chlorophyll content, leaf and grain N content, plant growth and yield parameters.

Current ambient ozone levels mitigate the effect of Puccinia striiformis on wheat: Is Mediterranean wheat ready for pre-industrial background ozone levels?

Increasing surface ozone is a main concern for crop production in the Global Change framework, especially in the Mediterranean basin where climate conditions favor its photochemical formation. Meanwhile, increasing common crop diseases, such as yellow rust, one of the most important pathogens affecting global wheat production has been detected in the area in recent decades. However, the impact of O on the occurrence and impact of fungal diseases is scarcely understood.

Ozone and Temperature May Hinder Adaptive Capacity of Mediterranean Perennial Grasses to Future Global Change Scenarios.

Climate warming is recognized as a factor that threatens plant species in Mediterranean mountains. Tropospheric ozone (O) should also be considered as another relevant stress factor for these ecosystems since current levels chronically exceed thresholds for plant protection in these areas. The main aim of the present study was to study the sensitivity of four Mediterranean perennial grasses to O and temperature based on plant growth, gas exchange parameters (photosynthesis-A, stomatal conductance-g, and water use efficiency-WUE), and foliar macro- (N, K, Ca, Mg, P, and S) and micronutrients (B, Cu, Fe, Mn, Mo, and Zn) content.

The Effects of Ozone on Visual Attraction Traits of (Geraniaceae) Flowers: Modelled Perception by Insect Pollinators.

Ozone (O) effects on the visual attraction traits (color, perception and area) of petals are described for , an endangered plant species. Plants were exposed to three O treatments: charcoal-filtered air (CFA), ambient (NFA) and ambient + 40 nL L O (FU+) in open-top chambers. Changes in color were measured by spectral reflectance, from which the anthocyanin reflectance index (ARI) was calculated.

DNA integrity and ecophysiological responses of Spanish populations of Ulmus glabra to increasing ozone levels.

Ulmus glabra is a deciduous tree with a wide distribution in the Eurosiberian region. The southernmost populations, in the Mediterranean area, are fragmented in mountain areas which act as a refugium. These small relict populations can act as sentinel of global change, including climate change and impacts of human activities such as air pollution.