Abstract
The photosynthetic characterization of the oriental lily (Lilium) cv. Sorbonne and its response to increasing water stress were analyzed based on the net photosynthetic rate (P n), stomatal conductance (g s), intercellular CO2 concentration (Ci), transpiration rate (E), water use efficiency (WUE), and stomatal limitation (Ls) in the Horqin Sandy Land of western China. A photosynthesis-PAR response curve was constructed to obtain light-compensation and light-saturation points (LCP and LSP), the maximum photosynthetic rates (P max) and dark respiration rates (R D). The growth of lilies in the pots was analyzed after anthesis. Various intensities of water stress (5, 10, and 20 days without water, and an unstressed control) were applied. The results indicated that drought stress not only significantly decreased P n, E, g s, photosynthetic pigment content (Chl a, Chl b, and Chl (a + b)) and increased intrinsic water use efficiency (WUE), but also altered the diurnal pattern of gas exchange. Drought stress also affected the photosynthesis (P n)-PAR response curve. Drought stress increased LCP and R D and decreased LSP and P max. There were both stomatal and nonstomatal limitations to photosynthesis. Stomatal limitation dominated in the morning, whereas nonstomatal limitation dominated in the afternoon. Thus, drought stress decreased potential photosynthetic capacity and affected the diurnal pattern of gas exchange and P n-PAR response curves, thereby reducing plant quality (lower plant height, flower length, flower diameter, and leaf area). Water stress is likely the main limitation to primary photosynthetic process in the lily. Appropriate watering is recommended to improve photosynthetic efficiency and alleviate photodamage, which will increase the commercial value of the lily in the Horqin Sandy Land.
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Abbreviations
- Ca :
-
atmospheric CO2 concentration
- Chl:
-
chlorophyll
- Ci :
-
intercellular CO2 concentration
- E :
-
transpiration rate
- g s :
-
stomatal conductance
- LCP:
-
light compensation point
- Ls:
-
stomatal limitation value
- LSP:
-
light saturation point
- PAR:
-
photosynthetically active radiation
- P max :
-
the maximum net photosynthetic rate
- P n :
-
net photosynthetic rate
- PSI:
-
photosystem I
- PSII:
-
photosystem II
- WUE:
-
water use efficiency
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Zhang, Y.J., Xie, Z.K., Wang, Y.J. et al. Effect of water stress on leaf photosynthesis, chlorophyll content, and growth of oriental lily. Russ J Plant Physiol 58, 844–850 (2011). https://doi.org/10.1134/S1021443711050268
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DOI: https://doi.org/10.1134/S1021443711050268