Journal
PHOTOSYNTHESIS RESEARCH
Volume 139, Issue 1-3, Pages 107-121Publisher
SPRINGER
DOI: 10.1007/s11120-018-0589-6
Keywords
Antioxidant system; Effective quantum yield of PSII; Light quality; Non-photochemical quenching of the excited state of chlorophyll a; Oryza sativa; Quantum yield of regulated energy dissipation in PSII
Categories
Funding
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB27020105]
- CAS-TWAS President's Fellowship Program
- Chinese Academy of Sciences (CAS) strategic leading project on agriculture [XDA08020301]
- National Basic Research and Development Program of the Ministry of Science and Technology of China [2015CB150104, 2014AA101601]
- National Science Foundation [C020401]
- office of Information Technology, Life Sciences
- Department of Plant Biology
- Department of Biochemistry
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Non-photochemical quenching (NPQ) of the excited state of chlorophyll a is a major photoprotective mechanism plants utilize to survive under high light. Here, we report the impact of long-term light quality treatment on photosynthetic properties, especially NPQ in rice. We used three LED-based light regimes, i.e., red (648-672nm), blue (438-460nm), and warm white light (529-624nm), with the incident photon flux density of 300 mu molphotonsm(-2)s(-1), the difference in the absorbed photon flux densities by leaves grown under different light quality being less than 7%. Our results show that blue light, as compared to white light, induced a significant decrease in F-v/F-m, a decreased rate of reduction of P-700(+) after P-700 was completely oxidized; furthermore, blue light also induced higher NPQ with an increased initial speed of NPQ induction, which corresponds to the qE component of NPQ, and a lower maximum quantum yield of PSII, i.e., Y(II). In contrast, rice grown under long-term red light showed decreased Y(II) and increased NPQ, but with no change in F-v/F-m. Furthermore, we found that rice grown under either blue or red light showed decreased transcript abundance of both catalase and ascorbate peroxidase, together with an increased H2O2 content, as compared to rice grown under white light. All these data suggest that even under a moderate incident light level, rice grown under blue or red light led to compromised antioxidant system, which contributed to decreased quantum yield of photosystem II and increased NPQ.
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