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Transcript and Metabolite Profiling for the Evaluation of Tobacco Tree and Poplar as Feedstock for the Bio-based Industry
Published on: May 16, 2014
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Transcriptome and Metabolome Analyses Reveal a Complex Stigma Microenvironment for Pollen Tube Growth in Tobacco
Hanxian Xiong1, Junjie Wang1, Xiaodi Gao1
1School of Life Science and Technology, Wuhan Polytechnic University, Wuhan 430023, China.
International Journal of Molecular Sciences
|November 27, 2024
Summary
Mature tobacco stigmas provide essential nutrients that promote pollen tube growth. This study identifies key metabolites and hormones, like cis-zeatin riboside, crucial for successful fertilization and optimizing in vitro pollen growth.
Area of Science:
- Plant reproductive biology
- Molecular plant science
- Biochemistry
Background:
- Fertilization success in flowering plants relies on pollen tube growth to deliver sperm to the ovule.
- The in planta environment significantly enhances pollen tube growth compared to in vitro conditions.
- The specific factors and regulatory mechanisms within the stigma that govern pollen tube development remain largely unknown.
Purpose of the Study:
- To investigate the role of stigma maturation in regulating pollen tube growth.
- To identify key molecular and metabolic factors in mature stigmas that support pollen tube development.
- To elucidate the nutritional microenvironment established during stigma maturation.
Main Methods:
- Comparative transcriptomic and qRT-PCR analyses to identify differentially expressed genes during stigma maturation.
- Metabolome analyses to profile metabolite accumulation in mature versus immature stigmas.
- In vitro assays to test the effect of stigma extracts and specific compounds on pollen tube growth.
Main Results:
- Mature stigma extract, unlike immature extract, significantly enhanced pollen tube growth in vitro.
- Gene expression analysis revealed enrichment in metabolic pathways during stigma maturation.
- Metabolome analysis identified distinct profiles, with increases in alkaloids, flavonoids, and terpenoids, and decreases in lipids and amino acids in mature stigmas.
- The plant hormone cis-zeatin and its derivative cis-zeatin riboside were found to be significantly increased and directly promoted pollen tube growth.
Conclusions:
- Stigma maturation establishes a specific nutritional microenvironment crucial for pollen tube growth.
- Key metabolites and hormones, particularly cis-zeatin riboside, play vital roles in facilitating pollen tube extension.
- These findings offer insights into optimizing in vitro pollen growth and understanding pollen-stigma interactions.
