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Humic acid enhances heat stress tolerance via transcriptional activation of Heat-Shock Proteins in Arabidopsis
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Humic acid enhances heat stress tolerance via transcriptional activation of Heat-Shock Proteins in Arabidopsis
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Journal Article
Humic acid enhances heat stress tolerance via transcriptional activation of Heat-Shock Proteins in Arabidopsis
2020
Overview
Humic acid (HA) is composed of a complex supramolecular association and is produced by humification of organic matters in soil environments. HA not only improves soil fertility, but also stimulates plant growth. Although numerous bioactivities of HA have been reported, the molecular evidences have not yet been elucidated. Here, we performed transcriptomic analysis to identify the HA-prompted molecular mechanisms in Arabidopsis. Gene ontology enrichment analysis revealed that HA up-regulates diverse genes involved in the response to stress, especially to heat. Heat stress causes dramatic induction in unique gene families such as
Heat-Shock Protein
(
HSP
) coding genes including
HSP101
,
HSP81.1
,
HSP26.5
,
HSP23.6
, and
HSP17.6A
. HSPs mainly function as molecular chaperones to protect against thermal denaturation of substrates and facilitate refolding of denatured substrates. Interestingly, wild-type plants grown in HA were heat-tolerant compared to those grown in the absence of HA, whereas Arabidopsis
HSP101
null mutant (
hot1
) was insensitive to HA. We also validated that HA accelerates the transcriptional expression of HSPs. Overall, these results suggest that
HSP101
is a molecular target of HA promoting heat-stress tolerance in Arabidopsis. Our transcriptome information contributes to understanding the acquired genetic and agronomic traits by HA conferring tolerance to environmental stresses in plants.
Publisher
Nature Publishing Group UK,Nature Publishing Group
Subject
/ 631/337
/ 631/449
/ Bovidae
/ Cattle
/ DNA
/ Drought
/ Heat-Shock Proteins - genetics
/ Heat-Shock Proteins - metabolism
/ Hogs
/ Humanities and Social Sciences
/ Iron
/ Science
/ Suidae
