Relaxing non-photochemical quenching (NPQ) to improve photosynthesis in crops
Author(s)
Kromdijk, Johannes
Walter, Julia
Language
EnglishAbstract
Sunlight intercepted by crop plants drives photosynthesis and growth. However, the light-harvesting antenna complexes that capture light energy for photosynthesis can also absorb too much light, which enhances the formation for reactive oxygen species and can result in damage to photosynthetic reaction centres. In order to prevent excessive damage, light-harvesting efficiency is reduced under high light, via upregulation of non-photochemical quenching (NPQ) processes involved in thermal dissipation of excitation energy in the photosystem II antennae. Relaxation of NPQ following high light exposure is not instantaneous and the response time increases with severity and longevity of the high light exposure. Due to slow NPQ relaxation, photosynthetic light use efficiency can be decreased for prolonged periods after high light exposure. In this chapter we review mechanistic understanding of light harvesting and NPQ, how NPQ can be measured and results from recent attempts to accelerate NPQ responses to light.
Keywords
Improving photosynthesis; photoprotection; NPQ; non-photochemical quenching; light harvesting; fluctuating light; photoinhibitionDOI
10.19103/AS.2022.0119.09ISBN
9781801463607, 9781801463607Publisher
Burleigh Dodds Science PublishingPublisher website
https://bdspublishing.com/Publication date and place
Cambridge, 2023Grantor
Imprint
Burleigh Dodds Science PublishingSeries
Burleigh Dodds Series in Agricultural Science,Classification
Botany and plant sciences
Sustainable agriculture
Agronomy and crop production