Strigol

Strigol is a type of carotenoid that is produced by plants and has a significant role in the physiology of plants. It was first identified in the root exudates of cotton plants and has since been found in a variety of other plants. Strigol is known for its role in promoting the germination of parasitic plants, specifically those in the Orobanchaceae family.

Chemical Structure and Synthesis

Strigol is a sesquiterpene lactone with a unique structure that includes a cyclopropane ring, a butenolide moiety, and a tricyclic lactone. The biosynthesis of strigol involves the conversion of beta-carotene into strigolactones through a series of enzymatic reactions. The key enzymes involved in this process are carotenoid cleavage dioxygenases (CCDs) and cytochrome P450s.

Role in Plant Physiology

Strigol plays a crucial role in the physiology of plants. It is involved in the regulation of plant growth and development, including root architecture, branching, and flowering. Strigol also plays a role in the response of plants to environmental stresses, such as drought and nutrient deficiency.

One of the most significant roles of strigol is its involvement in the germination of parasitic plants. Strigolactones are released into the soil by the roots of host plants, which are then detected by the seeds of parasitic plants. This triggers the germination of the parasitic seeds, allowing them to infect the host plant.

Strigol and Agriculture

The role of strigol in promoting the germination of parasitic plants has significant implications for agriculture. Parasitic plants, such as Striga and Orobanche, are major pests in many agricultural systems, causing significant crop losses. Understanding the role of strigol in the germination of these parasitic plants could lead to the development of strategies to control these pests.

Striga plant, a parasitic plant whose germination is triggered by strigol

See Also

• Carotenoid
• Parasitic plant
• Plant physiology
• Striga
• Orobanche