Effects of humic acid on photosynthetic efficiency of rapeseed plants growing under different watering conditionsReportar como inadecuado




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Photosynthetica

pp 1–9

First Online: 22 June 2017Received: 02 July 2016Accepted: 15 May 2017DOI: 10.1007-s11099-017-0745-9

Cite this article as: Lotfi, R., Kalaji, H.M., Valizadeh, G.R. et al. Photosynthetica 2017. doi:10.1007-s11099-017-0745-9

Abstract

Water is a limited resource and is likely to become even more restricted with climate change. The aim of this study was to evaluate the effect of humic acid HA applications on photosynthesis efficiency of rapeseed plants under different watering conditions. Water stress strongly increased electron transport flux, probability that trapped excitation can move an electron into the electron transport chain beyond QA, and quantum yield of reduction of end electron acceptors at the PSI acceptor side. Application of HA decreased the values of these parameters to be similar to those of non-stress conditions. We found that, the application of HA improved plants net photosynthesis under water stress via increasing the rate of gas exchange and electron transport flux in plants.

Additional key wordschlorophyll a fluorescence photosynthesis water stress AbbreviationsABS-RCabsorption flux per reaction center

CCIchlorophyll content index

ChlFchlorophyll a fluorescence

DI0-RCdissipation energy flux per RC

ETCelectron transfer chain

ET0-RCmaximum electron transport flux per RC

F0 ~ F20μsminimum fluorescence intensity at 20 μs

Fmmaximum fluorescence intensity at P-step ~300 ms

Fvvariable fluorescence

Fv-F0a value that is proportional to the activity of the water-splitting complex on the donor side of PSII

Fv-Fmmaximum quantum yield of PSII photochemistry

gsstomatal conductance

HAhumic acid

KNthe nonphotochemical de-excitation rate constant in the excited antennae for non-photochemistry

KPthe photochemical de-excitation rate constant in the excited antennae of energy fluxes for photochemistry

MWSmoderate water stress

OECoxygen-evolving complex

OJIPtransient-fluorescence induction defined by the names of its intermediate steps

PItotalperformance index

PNnet photosynthetic rate

Smrepresenting energy necessary for the closure of all reaction centers

SWSsevere water stress

TR0-RCtrapped energy flux per RC

VJrelative variable florescence at J-step 2 ms

VIrelative variable florescence at I-step 30 ms

WWCwell watering condition

ѱE0probability that trapped excitation moves an electron into the electron transport chain beyond QA-

φR0quantum yield of reduction of end electron acceptors at the PSI acceptor side

δR0probability with which an electron from the intersystem electron carriers move to reduce end electron acceptors at the PSI acceptor side

This article is published with open access at link.springer.com

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Autor: R. Lotfi - H. M. Kalaji - G. R. Valizadeh - E. Khalilvand Behrozyar - A. Hemati - P. Gharavi-Kochebagh - A. Ghassemi

Fuente: https://link.springer.com/







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