Regulation of growth and stress metabolism in rice plants through foliar and root application of seaweed extract from Kappaphycus alvarezii (Rhodophyta)

Regulation of growth and stress metabolism in rice plants through foliar and root application of seaweed extract from Kappaphycus alvarezii (Rhodophyta)

The red alga Kappaphycus alvarezii (Rhodophyta) is one of the most cultivated species in the world. Extracts obtained from Kappaphycus (K Alv -sap) have been shown to promote plant growth as well as defense against abiotic stresses. The present study aimed to examine the regulation of photosynthesis...

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Bibliographic Details
Published in:Journal of applied phycology Vol. 36; no. 4; pp. 2295 - 2310
Main Authors: van Tol de Castro, Tadeu Augusto, Tavares, Orlando Carlos Huertas, de Oliveira Torchia, Danielle França, Pereira, Erinaldo Gomes, Rodrigues, Natalia Fernandez, Santos, Leandro Azevedo, do Amaral Vendramini, Ana Lúcia, da Mata, Mauricio Roque, Viêgas, Carolina Vieira, Berbara, Ricardo Luiz Louro, García, Andrés Calderín
Format: Journal Article
Language:English
Published: Dordrecht Springer Netherlands 01-08-2024
Springer Nature B.V
Subjects:
Abiotic stress
Algae
Biomedical and Life Sciences
Ecology
Efficiency
Foliar applications
Freshwater & Marine Ecology
Germination
Homeostasis
Kappaphycus
Kappaphycus alvarezii
Life Sciences
Metabolism
Oryza sativa
Photosynthesis
Plant extracts
Plant growth
Plant Physiology
Plant Sciences
Plants
Rhodophyta
Rice
Root development
Seaweeds
Seeds
Seaweed extract
Biostimulant
Stress regulation
Gene expression
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Summary:The red alga Kappaphycus alvarezii (Rhodophyta) is one of the most cultivated species in the world. Extracts obtained from Kappaphycus (K Alv -sap) have been shown to promote plant growth as well as defense against abiotic stresses. The present study aimed to examine the regulation of photosynthesis and the genetic and metabolic mechanisms resulting from foliar and root application of K Alv -sap in rice plants ( Oryza sativa ). K Alv -sap was obtained from fresh algae cultivated in the bay of Ilha Grande, Paraty, Brazil, and previously well characterized. Experiments were performed using applications at 21 and 24 days after germination (DAG) with four treatments: control (without K Alv -sap); two foliar application treatments with 2% and 10% K Alv -sap (2% K-sapF and 10% K Alv -sapF, respectively); and root application treatment with 2% K Alv -sap (2% K Alv -sapR). Both foliar and root applications of K Alv -sap promoted improved photosynthetic efficiency transport and adaptive response to the stress, at least until 27 DAG. K Alv -sap application increased the uptake of N and K, leading to an increase in N-NO 3 - and amino-N. Such conditions promote increases in biomass production, growth, and root development. Root application of K Alv -sap stimulated the growth of plants at later times compared to foliar application and, in both cases, the pathways of action include the regulation of redox homeostasis. The results shed light on the pathways of action stimulated by aqueous extracts of Kappaphycus , contributing to the improvement of the agricultural bioinputs.
ISSN:0921-8971
1573-5176
DOI:10.1007/s10811-024-03216-y