What question did this study set out to answer?

To determine how spatial and temporal expression patterns of the gibberellin 3-oxidase gene (PsGA3ox1) control hormone biosynthesis, catabolism, and morphological development in pea.

August 26, 2013PLANT PHYSIOLOGYOpen Access

Gibberellin 3-oxidase Gene Expression Patterns Influence Gibberellin Biosynthesis, Growth, and Development in Pea

View Full Paper

Ask AI

Bookmark

Authors

DRDennis M. ReineckeUniversity of Alberta AWAruna D. WickramarathnaUniversity of Alberta JOJocelyn A. OzgaUniversity of Alberta

Discussion

Member takes

Implication

Transgenic and genetic analysis reveals that localized PsGA3ox1 expression directs gibberellin homeostasis and elongation in pea, indicating tissue-level regulation dictates hormone activity.

Key Points

To determine how spatial and temporal expression patterns of the gibberellin 3-oxidase gene (PsGA3ox1) control hormone biosynthesis, catabolism, and morphological development in pea.
Generated transgenic pea (Pisum sativum, lele dwarf background) expressing PsGA3ox1 under the constitutive cauliflower mosaic virus-35S promoter.
Constructed backcrossed comparison lines (BC LEle) introducing the endogenous PsGA3ox1 allele into the identical genetic background.
Analyzed tissue-specific GA1 concentrations, expression of the GA-deactivating gene PsGA2ox1, and phenotypic changes in internodes, tendrils, stipules, and meristems.
Constitutive PsGA3ox1 expression increased GA1 concentrations, producing longer internodes, tendrils, and fruits, larger stipules, delayed flowering, and altered vascular development relative to null controls.
Backcrossed lines with endogenous PsGA3ox1 expression developed substantially longer internodes and accumulated much higher GA1 levels than 35S-driven transgenic lines.
Elevated PsGA2ox1 expression limited GA1 accumulation in transgenic lines via feed-forward deactivation, whereas endogenous promoter control avoided this induction.

Cite This Study

Reinecke et al. (2013) studied this question.

synapsesocial.com/papers/6a93cfa5714eeec8661d3845 https://doi.org/10.1104/pp.113.225987

View Full Paper

Ask AI

Bookmark

Implication

Transgenic and genetic analysis reveals that localized PsGA3ox1 expression directs gibberellin homeostasis and elongation in pea, indicating tissue-level regulation dictates hormone activity.

Gibberellin 3-oxidase Gene Expression Patterns Influence Gibberellin Biosynthesis, Growth, and Development in Pea

Discussion

Member takes

Implication

Key Points

Cite This Study

Gibberellin 3-oxidase Gene Expression Patterns Influence Gibberellin Biosynthesis, Growth, and Development in Pea

Discussion

Member takes

Implication

Key Points

Cite This Study

Also Consider

Also Consider