Polyamines effectively mitigate senescence in persistent leaves of Berginia ciliata – a novel model system
Foziya Altaf
A , Shazia Parveen A , Sumira Farooq A , Aehsan ul Haq A , Mohammad Lateef Lone A , Inayatullah Tahir A * , Prashant Kaushik B and Hamed A. El-Serehy C
+ Author Affiliations
- Author Affiliations
A Plant Physiology and Biochemistry Research Laboratory, Department of Botany, University of Kashmir, Srinagar 190006, India.
B Instituto de Conservación y Mejora de la Agrodiversidad Valenciana, Universitat Politècnica de València, 46022 Valencia, Spain.
C Department of Zoology, College of Science, King Saud University, Riyadh 11451, Saudi Arabia.
Functional Plant Biology - https://doi.org/10.1071/FP21273
Submitted: 7 September 2021 Accepted: 10 January 2022 Published online: 11 February 2022
© 2022 The Author(s) (or their employer(s)). Published by CSIRO Publishing
Abstract
Plant leaves provide a unique insight into the changes that occur in organs, tissues and cells as they approach senescence. As part of the parental outlay, plants instigate leaf senescence to reallocate resources from older tissues to new organs towards the termination of the growing season. The aim of crop breeding initiatives is to optimize senescence for specific species. Considering hormonal regulation and their crosstalk during leaf senescence through integration of developmental signals, this work examines the efficacy of polyamines (PAs) in modulating several biochemical and physiological aspects with an ultimate aim to delay leaf senescence in leaf discs of Berginia ciliata (Haw.) sternb. Leaf discs were treated with putrescine (Put), spermidine (Spd) and spermine (Spm) at 20 μM, 20 μM and 15 μM concentration, respectively. A set of leaf discs kept in distilled water served as the control. Leaf discs treated with PAs were green and fresh by about 4 days compared to the control, thus exhibited delayed senescence. This delayed leaf senescence corroborated with the maintenance of high activity of reactive oxygen species (ROS) scavenging antioxidant enzymes viz, superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX) and higher content of chlorophylls. A marked increase was also observed in membrane stability and soluble proteins in leaf discs treated with PAs. Exogenous PAs reduced oxidative stress in the leaf discs, as revealed by lower malondialdehyde (MDA) level, which is manifested as reduced lipid peroxidation (LPO). Improved membrane stability was proportional to lower LPO, as measured by the membrane stability index (MSI).
Keywords: Berginia ciliata, chlorophyll, oxidative stress, putrescine, ROS, senescence, spermidine, spermine.
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