Publikation:

Arabidopsis thaliana B‐GATA factors repress starch synthesis and gravitropic growth responses

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Datum

2023

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Sala, Jan
Schwechheimer, Claus

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Deutsche Forschungsgemeinschaft (DFG): DFG SCHW751/19‐1

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Published

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New Phytologist. Wiley. 2023, 239(3), S. 979-991. ISSN 0028-646X. eISSN 1469-8137. Verfügbar unter: doi: 10.1111/nph.18992

Zusammenfassung

Plants perceive the direction of gravity during skotomorphogenic growth, and of gravity and light during photomorphogenic growth. Gravity perception occurs through the sedimentation of starch granules in shoot endodermal and root columella cells. In this study, we demonstrate that the Arabidopsis thaliana GATA factors GNC (GATA, NITRATE-INDUCIBLE, CARBON METABOLISM-INVOLVED) and GNL/CGA1 (GNC-LIKE/CYTOKININ-RESPONSIVE GATA1) repress starch granule growth and amyloplast differentiation in endodermal cells.

In our comprehensive study, we analysed gravitropic responses in the shoot, root and hypocotyl. We performed an RNA-seq analysis, used advanced microscopy techniques to examine starch granule size, number and morphology and quantified transitory starch degradation patterns. Using transmission electron microscopy, we examined amyloplast development.

Our results indicate that the altered gravitropic responses in hypocotyls, shoots and roots of gnc gnl mutants and GNL overexpressors are due to the differential accumulation of starch granules observed in the GATA genotypes. At the whole-plant level, GNC and GNL play a more complex role in starch synthesis, degradation and starch granule initiation.

Our findings suggest that the light-regulated GNC and GNL help balance phototropic and gravitropic growth responses after the transition from skotomorphogenesis to photomorphogenesis by repressing the growth of starch granules.

Zusammenfassung in einer weiteren Sprache

Fachgebiet (DDC)
570 Biowissenschaften, Biologie

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Plant Science

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ISO 690SALA, Jan, Niccolo MOSESSO, Erika ISONO, Claus SCHWECHHEIMER, 2023. Arabidopsis thaliana B‐GATA factors repress starch synthesis and gravitropic growth responses. In: New Phytologist. Wiley. 2023, 239(3), S. 979-991. ISSN 0028-646X. eISSN 1469-8137. Verfügbar unter: doi: 10.1111/nph.18992
BibTex
@article{Sala2023-05-23Arabi-67249,
  year={2023},
  doi={10.1111/nph.18992},
  title={Arabidopsis thaliana B‐GATA factors repress starch synthesis and gravitropic growth responses},
  number={3},
  volume={239},
  issn={0028-646X},
  journal={New Phytologist},
  pages={979--991},
  author={Sala, Jan and Mosesso, Niccolo and Isono, Erika and Schwechheimer, Claus}
}
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In our comprehensive study, we analysed gravitropic responses in the shoot, root and hypocotyl. We performed an RNA-seq analysis, used advanced microscopy techniques to examine starch granule size, number and morphology and quantified transitory starch degradation patterns. Using transmission electron microscopy, we examined amyloplast development.

Our results indicate that the altered gravitropic responses in hypocotyls, shoots and roots of gnc gnl mutants and GNL overexpressors are due to the differential accumulation of starch granules observed in the GATA genotypes. At the whole-plant level, GNC and GNL play a more complex role in starch synthesis, degradation and starch granule initiation.

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Corresponding Authors der Uni Konstanz vorhanden
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Ja
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Ja
Link zu Forschungsdaten
Beschreibung der Forschungsdaten
The RNAseq data that support the findings of this study
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