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Why are plants sensing UV-B radiation using a dedicated UV-B photoreceptor? This is an intriguing question, especially as UV-B induced stress is rare in well adapted plants. A novel paper by Rippa et al. reports that UV-B drives a cooling response in plant leaves, implying that plants 鈥渆xploit鈥� UV-B to adjust to warm, sunny weather.

The UV-mediated induction of plant metabolites has important consequences for the plant, but also for other organisms that feed on plant tissues. This paper by Takshak and Agrawal highlights the importance of UV induced metabolites in medicinal plants and details how these metabolites can benefit consumer species.

The UV-mediated inhibition of plant elongation responses results in a more compact, dwarfed organism. Such 鈥渄warfing鈥� has consequences when plants are competing for exposure to photosynthetic light, with smaller plants more likely to be shaded. However, compact plants are also a major advantage for the horticultural trade. Plants are shipped all over the world and a more compact organism can save considerably on transport costs. This paper by Tavridou et al. identifies parts of the mechanism underlying the dwarfing response.

The commercial exploitation of UV for plant production continues to drive the need to improve plant UV research. This commercial exploitation is in part due to the development of novel LEDs that can provide specific UV wavelengths 鈥� which make it possible to manipulate the impact of UV on plants. However, plant UV research still needs to be further developed to become commercially viable. This paper by Robson et al. (2019) highlights potential knowledge gaps that need to be addressed in order to improve exploitation of plant UV research further.

Ireland is not a country known for its sunshine and exposure to UV-radiation. However, a new paper by Dr Aoife Coffey and Prof. Marcel Jansen shows that natural, solar UV-B radiation has measurable effects on plants grown outdoors in Ireland. In the Irish summer, plants exposed to UV-containing sunlight stay considerably more compact compared to those exposed to filtered sunlight, devoid of UV radiation.

The UNEP Environmental Effects Assessment Panel (EEAP) has been reporting on the various effects of ozone layer depletion since 1989. Annual reports capture recent research highlights, while quadrennial reports summarise the larger, important trends in our understanding of the impacts of ozone layer depletion. The latest (annual) report was published in 2020, and the part on impacts of UV on terrestrial ecosystems can be found in:

Improvements in LED technology open new opportunities for horticultural lighting. This article by Kusuma et al. discusses the fundamental physics and efficiency of LEDs for plant growth. Spectral quality of lighting affects photosynthesis and plant shape, and is discussed in the context of use of light fixtures in horticulture.

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