Parthenium hysterophorus steps up Ca-regulatory pathway in defence against highlight intensities.

Abstract:

:Parthenium hysterophorus exhibits tolerance to a great extent against abiotic stresses including high light intensities. In this study, P. hysterophorus was subjected to three different light intensities viz. control (CL, 250 µmol photons m-2 s-1), moderately high (ML, 500 µmol photons m-2 s-1) and high (HL, 1000 µmol photons m-2 s-1) for assessment of biochemical and physiological responses at 3 and 5 days after treatment (DAT). Proteomic responses were also observed at 5 DAT. Level of oxidative stress marker, abundance of H2O2 and O2- was highest in leaves exposed to HL followed by ML treatment. Biomass accumulation, photosynthetic parameters, chloroplast and mitochondrial integrity were also affected by both ML and HL treatments. Differential protein expression data showed modulation of thirty-eight proteins in ML and HL intensities. P. hysterophorus exhibited good ability to survive in ML then HL treatment as demonstrated by enhancement of the antioxidant system and photosynthesis. Furthermore, P. hysterophorus mobilized some key proteins related to calcium signaling, which in turn coordinate physiological homeostasis under stress. Proline and total soluble sugar content were high under stress; however, results of simulated experiment of our study indicate such accumulation of osmolytes may inhibit photon-availability to chloroplast. These results clarify our understanding of the mechanisms underlying the light stress tolerance of P. hysterophorus.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Ahmad J,Baig MA,Amna,Alaraidh IA,Alsahli AA,Qureshi MI

doi

10.1038/s41598-020-65721-7

subject

Has Abstract

pub_date

2020-06-02 00:00:00

pages

8934

issue

1

issn

2045-2322

pii

10.1038/s41598-020-65721-7

journal_volume

10

pub_type

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