Abstract
Using measures of gas exchange and photosynthetic chain activity, we found some differences between grapevine inflorescence and leaf in terms of photosynthetic activity and photosynthesis regulations. Generally, the leaf showed the higher net photosynthesis (P N) and lower dark respiration than that of the inflorescence until the beginning of the flowering process. The lower (and negative) P N indicated prevailing respiration over photosynthesis and could result from a higher metabolic activity rather than from a lower activity of the photosynthetic apparatus. Considerable differences were observed between both organs in the functioning and regulation of PSI and PSII. Indeed, in our conditions, the quantum yield efficiency and electron transport rate of PSI and PSII were higher in the inflorescence compared to that of the leaf; nevertheless, protective regulatory mechanisms of the photosynthetic chain were clearly more efficient in the leaf. This was in accordance with the major function of this organ in grapevine, but it highlighted also that inflorescence seems to be implied in the whole carbon balance of plant. During inflorescence development, the global PSII activity decreased and PSI regulation tended to be similar to the leaf, where photosynthetic activity and regulations remained more stable. Finally, during flowering, cyclic electron flow (CEF) around PSI was activated in parallel to the decline in the thylakoid linear electron flow. Inflorescence CEF was double compared to the leaf; it might contribute to photoprotection, could promote ATP synthesis and the recovery of PSII.
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Abbreviations
- BBCH:
-
Biologische Bundesanstalt, Bundessortenamt and Chemical Industry
- CEF:
-
cyclic electron flow
- Chl:
-
chlorophyll
- cyt b6f :
-
cytochrome b6f complex
- DS:
-
developmental stage
- ETRI :
-
electron transport rate of PSI
- ETRII :
-
electron transport rate of PSII
- F0 :
-
minimal fluorescence yield of the dark-adapted state
- F0':
-
minimal fluorescence yield of the light-adapted state
- Fm :
-
maximal fluorescence yield of the dark-adapted state
- Fm':
-
maximal fluorescence yield of the light-adapted state
- Fd:
-
ferredoxin
- FNR:
-
ferredoxin NADP+ reductase
- FM:
-
fresh mass
- Fv/Fm :
-
maximum quantum yield of PSII photochemistry
- NPQ:
-
nonphotochemical quenching
- LEF:
-
linear electron flow
- PC:
-
plastocyanin
- PEPC:
-
phosphoenolpyruvate carboxylase
- P N :
-
net photosynthetic rate
- PQ:
-
plastoquinone
- R D :
-
dark respiration
- ROS:
-
reactive oxygen species
- RuBP:
-
ribulose-1,5-bisphosphate
- YCEF :
-
quantum yield of cyclic electron flow
- YI :
-
efficient quantum yield of PSI
- YII :
-
efficient quantum yield of PSII
- YNA :
-
PSI acceptor side limitation
- YND :
-
PSI donor side limitation
- YNO :
-
quantum yield of nonregulated energy dissipation
- YNPQ :
-
quantum yield of regulated energy dissipation
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Sawicki, M., Courteaux, B., Rabenoelina, F. et al. Leaf vs. inflorescence: differences in photosynthetic activity of grapevine. Photosynthetica 55, 58–68 (2017). https://doi.org/10.1007/s11099-016-0230-x
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DOI: https://doi.org/10.1007/s11099-016-0230-x