Abstract
The dynamics between fluorescence (Fs) yield and photochemical (P) yield in a changing environment are essential for understanding the relationship between photosynthesis and fluorescence. The ratio of Fs yield and P yield tends to be constant under high light intensity, but the relationship between these two yields, and its response to environmental conditions, need to be explored further under intermediate and low light. In this study, we performed leaf-scale measurements of fluorescence parameters by pulse-amplitude modulation (PAM) technology in summer maize (Zea mays L.) plants grown under intermediate light conditions in a climate chamber. Plants were treated as moderately water stressed and non-water stressed. Results showed that a decrease in P yield was accompanied by increases in Fs yield and non-photochemical quenching (NPQ) yield in response to moderate water stress under intermediate and low light conditions. Fs yield was negatively correlated with P yield under intermediate and low light conditions when there was sufficient soil water in the root zone. Under water stress, the correlation between Fs yield and P yield was negative in low light, but became positive under higher light levels. Fs yield was negatively related to P yield when NPQ yield was low; however, they were synergistically and positively associated when excessive light dissipation was dominated by NPQ.
Highlights
Chlorophyll fluorescence is red and far-red light (650–800 nm) emitted by chlorophyll a pigments a few nanoseconds after light absorption (Porcar-Castell et al, 2014; Damm et al, 2015; Verrelst et al, 2016)
Under intermediate and low light conditions, higher light intensity causes the closure of photosynthetic reaction centers by reducing the primary quinone acceptor of photosystem II (PSII) (QA); photochemical quenching is reduced while fluorescence intensifies (Baker, 2008; Porcar-Castell et al, 2014).Fs yield is negatively related to P yield
Porcar-Castell et al (2014) reported that Fs yield is negatively related to P yield when non-photochemical quenching (NPQ) is low, but the relationship becomes positive with increasing NPQ
Summary
Chlorophyll fluorescence is red and far-red light (650–800 nm) emitted by chlorophyll a pigments a few nanoseconds after light absorption (Porcar-Castell et al, 2014; Damm et al, 2015; Verrelst et al, 2016). Sensed chlorophyll fluorescence from satellite imaging is providing new data sources to characterize the dynamics of gross photosynthesis at Studies have shown that solar-induced fluorescence (SIF) is closely related to gross primary production (GPP) at regional or ecosystem scale (Guanter et al, 2014; Zhang et al, 2016a), especially when there is water stress (Lee et al, 2013; Wang et al, 2016). Some empirical linear relationships between SIF and GPP have been developed to directly estimate the productivity of vegetation using remote sensing of SIF (Guanter et al, 2014;Wagle et al, 2016)
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