Photosynthetica

, Volume 56, Issue 1, pp 468–477 | Cite as

Adaptation strategies of two leaf cohorts of Prosopis juliflora produced in spring and monsoon

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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.

Additional key words

carbon assimilation carboxylation efficiency dark respiration rate quantum efficiency tree photosynthesis water-use efficiency 

Abbreviation

CE

carboxylation efficiency

Chl

chlorophyll

Ci

substomatal CO2 concentration

E

transpiration

gs

stomatal conductance to H2O

PN

net photosynthetic rate

PNLCP

light-compensation point

PNLSP

light-saturation point

PNmax

maximum photosynthetic rate

PNQE

apparent quantum efficiency

RD

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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Copyright information

© The Institute of Experimental Botany 2018

Authors and Affiliations

  1. 1.Plant Physiology LaboratoryCSIR# - National Botanical Research InstituteLucknowIndia

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