High photosynthetic efficiency of a rice (Oryza sativa L.) xantha mutant
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Abstract
Comparative analysis revealed that a xantha rice mutant (cv. Huangyu B) had higher ratios of chlorophyll (Chl) a/b and carotenoids/Chl, and higher photosynthetic efficiency than its wild type parent (cv. II32 B). Unexpectedly, the mutant had higher net photosynthetic rate (P N) than II32 B. This might have resulted from its lower non-photochemical quenching (qN) but higher maximal photochemical efficiency (FV/FM), higher excitation energy capture efficiency of photosystem 2 (PS2) reaction centres (FV′/FM′), higher photochemical quenching (qP), higher effective PS2 quantum yield (ΦPS2), and higher non-cyclic electron transport rate (ETR). This is the first report of a chlorophyll mutant that has higher photosynthetic efficiency and main Chl fluorescence parameters than its wild type. This mutant could become a unique material both for the basic research on photosynthesis and for the development of high yielding rice cultivars.
Additional key words
chlorophyll b-deficiency chlorophyll fluorescence net photosynthetic rate Oryza sativa photosynthetic efficiency xantha mutationAbbreviations
- AQY
apparent quantum yield
- Car
carotenoids
- Chl
chlorophyll
- ETR
non-cyclic electron transport rate
- FM
maximum Chl fluorescence yield in the dark-adapted state
- FM′
maximum Chl fluorescence yield in the light-adapted state
- F0
minimum Chl fluorescence yield in the dark-adapted state
- F0′
minimum Chl fluorescence yield in the light-adapted state
- FS
steady-state Chl fluorescence yield
- FV
variable Chl fluorescence
- FV/FM
maximal photochemical efficiency
- FV′/FM′
excitation energy capture efficiency of PS2 reaction centres
- PN
net photosynthetic rate
- PPFD
photosynthetic photon flux density
- PS2
photosystem 2
- qN
non-photochemical quenching
- qP
photochemical quenching
- ΦPS2
effective PS2 quantum yield
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