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Transcriptome analysis of alfalfa glandular trichomes
Naveed Aziz1, Nancy L Paiva, Gregory D May
1Plant Biology Division, Samuel Roberts Noble Foundation, 2510 Sam Noble Parkway, Ardmore, OK 73401, USA.
Planta
|December 4, 2004
Summary
Glandular trichomes in alfalfa (Medicago sativa L.) are vital for natural product synthesis. Gene expression studies reveal key enzymes for flavonoid production and over 1,000 potentially important genes for trichome function.
Area of Science:
- Plant Biology
- Molecular Biology
- Biochemistry
Background:
- Glandular trichomes are crucial for plant defense through natural product synthesis.
- Understanding trichome gene expression provides insights into plant defense mechanisms.
- Previous research has not comprehensively analyzed trichome gene expression globally.
Purpose of the Study:
- To investigate the global gene expression patterns in alfalfa (Medicago sativa L.) glandular trichomes.
- To identify genes involved in natural product biosynthesis and other functions within trichomes.
- To compare gene expression using both cDNA library sequencing and microarray analysis.
Main Methods:
- Sequencing of 5,674 clones from an alfalfa glandular trichome cDNA library.
- Microarray analysis comparing alfalfa stem transcript levels with and without trichomes, using Medicago truncatula genes.
- Histochemistry and metabolite profiling to confirm findings.
Main Results:
- The most abundant expressed sequence tag (EST) was a lipid transfer protein.
- Evidence suggests significant flavonoid biosynthesis within alfalfa trichomes.
- Microarray analysis identified over 1,000 genes with preferential expression in trichome-rich stem fractions, many of unknown function.
Conclusions:
- Alfalfa glandular trichomes are sites of significant flavonoid biosynthesis.
- A large set of genes, including many with unknown functions, are preferentially expressed in trichomes, indicating their importance for trichome biology.
- These findings provide a foundation for understanding the genetic basis of trichome function in plants.