Abstract
Little is known regarding to impact of simulated shading conditions on cotton yield and fiber quality at different fruiting positions. In this 2-year study, our field experiments investigated the effects of shading percentage on the cotton yield, fiber properties, photosynthesis, and carbohydrate concentrations in boll’s subtending leaves during various growing stages at different fruiting positions (FP). Net photosynthetic rate and effective quantum yield of PSII photochemistry decreased in response to shading on both FP1 and FP3 of the 7th sympodial branches, respectively. Shading also reduced sucrose and starch contents of leaves at each fruiting position. Shading decreased the number and mass of cotton bolls, the fiber strength and micronaire, while the fiber length increased at both fruiting positions. Our results suggested that shading resulted in the reduction of the cotton yield and fiber quality, which are mainly associated with the changes in boll number and alteration of photosynthesis and carbohydrate concentrations during the boll development.
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Abbreviations
- C i :
-
intercellular CO2 concentration
- Chl:
-
chlorophyll
- DM:
-
dry mass
- FP:
-
fruit branch
- Fv/Fm :
-
quantum efficiency of PSII
- g s :
-
stomatal conductance
- LMA:
-
leaf mass per area
- MIC:
-
fiber micronaire
- P N :
-
net photosynthetic rate
- ΦPSII :
-
effective quantum yield of PSII photochemistry
- qN :
-
nonphotochemical quenching coefficient
- qP :
-
photochemical quenching coefficient
- S0:
-
no shading, control
- S1:
-
21% of solar radiation blocked
- S2:
-
38% of solar radiation blocked
- ST:
-
fiber strength
- TAA:
-
time after anthesis
- UHM:
-
fiber length
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Acknowledgments: We are grateful for grants from the National Key Technology Support Program no. 2014BAD11B02, 2014BAD03B02, China Agriculture Research System no. CARS-18-20, Special Fund for Agro-scientific Research in the Public Interest no. 201203096, 201503109.
B.L. Chen and H.K. Yang contributed equally to this work.
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Chen, B.L., Yang, H.K., Ma, Y.N. et al. Effect of shading on yield, fiber quality and physiological characteristics of cotton subtending leaves on different fruiting positions. Photosynthetica 55, 240–250 (2017). https://doi.org/10.1007/s11099-016-0209-7
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DOI: https://doi.org/10.1007/s11099-016-0209-7