Abstract
UV-B radiation and osmotic stress (like drought and salinity) have a significant effect on physiology, morphology, biochemistry and molecular biology. To cope with such stimuli, plants must be able to effectively sense, respond to and adapt to changes in their biological activities. Hence, signal transduction pathways play important role in response to environmental stimuli. In this study, the expression of three Histidine Kinases including ZmHK1, ZmHK2 and ZmHK3a was studied in maize plants exposed to 8 days drought, salinity and UV-B stresses applying transcript approach. The semi-quantitative RT-PCR analyses of ZmHKs showed up-regulation of ZmHK1 and ZmHK3 agenes after 8 days exposure to applied stresses except salinity in leaves, although, their regulation was more prominent during drought stress. Astonishingly, exposure to these stresses showed down-regulation of all genes in maize roots. However, the ZmHK1 behavior was quite different from two other homologues and showed up-regulation in combined stresses. We suggest that ZmHK1 and ZmHK3a, as cytokinin transmembrane receptors, sense osmolarity changes in cells caused by dehydration. Our data supports the involvement of ZmHK homologues under these stresses in maize and provides a gene expression dynamics during the stress which will be valuable for further studies of the molecular mechanisms of stress tolerance in maize.
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Claims 4
Claim · model-written summary
Drought and UV-B upregulated ZmHK1 and ZmHK3 in leaves, especially drought.
- Organ / stage
- leavese0
- Treatment
- applied stresses except salinitye0
- Gene
- ZmHK1 and ZmHK3e0
- Outcome
- up-regulation of ZmHK1 and ZmHK3 agenese0
- Direction
- up-regulatione0
- Qualifier
- more prominent during drought stresse0
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“up-regulation of ZmHK1 and ZmHK3 agenes after 8 days exposure to applied stresses except salinity in leaves, although, their regulation was more prominent during drought stress.”
e1“maize plants exposed to 8 days drought, salinity and UV-B stresses”
Claim · model-written summary
The stresses downregulated all studied genes in roots.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exposure to these stresses showed down-regulation of all genes in maize roots.”
Claim · model-written summary
Combined stresses upregulated ZmHK1.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ZmHK1 behavior was quite different from two other homologues and showed up-regulation in combined stresses.”
t0“Zea mays L.”
Claim · model-written summary
Authors propose ZmHK1 and ZmHK3a sense dehydration-related osmolarity changes.
- Gene
- ZmHK1 and ZmHK3ae0
- Outcome
- sense osmolarity changes in cells caused by dehydratione0
- Qualifier
- as cytokinin transmembrane receptorse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“We suggest that ZmHK1 and ZmHK3a, as cytokinin transmembrane receptors, sense osmolarity changes in cells caused by dehydration.”
t0“Zea mays L.”
The same questions in other papers
salinity · molecular: expression · Zea mays (maize)Positive and negative results
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