Abstract
Prosopis juliflora is an invasive leguminous tree species growing profusely under wide environmental conditions. Primary objective of this study was to investigate adaptation strategies evolved to deal with wide environmental conditions during different seasons. P. juliflora adapts through a production of leaves in two seasons, namely, the spring (the first cohort) and monsoon (the second cohort) with differing but optimal physiological characteristics for growth in respective seasons. Our studies show that the first cohort of leaves exhibit maximum carbon fixation under moderate temperatures and a wide range of PPFD. However, these leaves are sensitive to high leaf-to-air-vapor pressure deficit (VPD) occurring at high temperatures in summer resulting in senescence. While the second cohort of leaves produced during monsoon showed maximum carbon fixation at high irradiance and temperatures with low VPD, it is sensitive to low temperatures causing senescence in winter.
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Abbreviations
- CE:
-
carboxylation efficiency
- Chl:
-
chlorophyll
- C i :
-
substomatal CO2 concentration
- E :
-
transpiration
- g s :
-
stomatal conductance to H2O
- P N :
-
net photosynthetic rate
- P NLCP :
-
light-compensation point
- P NLSP :
-
light-saturation point
- P Nmax :
-
maximum photosynthetic rate
- P NQE :
-
apparent quantum efficiency
- R D :
-
rate of mitochondrial respiration in darkness
- VPD:
-
leaf-to-air-vapor pressure deficit
- WUE:
-
water-use efficiency
- Γ:
-
CO2-compensation point
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Acknowledgements: The authors wish to thank the Director CSIR–NBRI for providing the necessary facility.
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Shirke, P.A., Pathre, U.V. & Sane, P.V. Adaptation strategies of two leaf cohorts of Prosopis juliflora produced in spring and monsoon. Photosynthetica 56, 468–477 (2018). https://doi.org/10.1007/s11099-018-0794-8
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DOI: https://doi.org/10.1007/s11099-018-0794-8