English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Guard cells shrink in response to drought and abscisic acid (ABA), which is caused by efflux of ions that in turn reduces stomatal aperture and improves the plant’s ability to retain moisture. Cytosolic free calcium is an essential secondary messenger in guard cell ABA signaling, but the details of this regulatory pathway remain sketchy. Here, the calmodulin-like protein CML20, which has four EF-hand domains and calcium-binding activity  in vitro , was found to be a negative regulator of ABA-induced stomatal movement in  Arabidopsis . The guard cells of  cml20  loss-of-function mutant plants were hypersensitive to both ABA-activated S-type anion currents, and ABA inhibited inward K +  currents than those of wild type. Additional, due to smaller stomatal aperture,  cml20  showed less water loss from the leaves than wild type. These phenotypes of  CML20  overexpressing plants contrasted with wild type in the opposite direction. In the  cml20  mutant, the transcripts of stress responsive genes, such as  MYB2, RAB18, ERD10, COR47 , and  RD29A  were up-regulated in response to drought and ABA, while down-regulated of  APX2  transcription and higher reactive oxygen species (ROS) accumulation. These observations support the CML20, a functional Ca 2+  sensor, is a negative regulator in guard cell ABA signaling.

CML20, an Arabidopsis Calmodulin-like Protein, Negatively Regulates Guard Cell ABA Signaling and Drought Stress Tolerance