Zinc deficiency in plants and its effect on biosynthesis of auxin:

Zinc is an essential micronutrient required by plants for their proper growth and development. It is involved in various physiological processes such as carbon fixation, DNA replication, and protein synthesis. Zinc deficiency in plants can have detrimental effects on their growth and yield. One of the effects of zinc deficiency is the reduced biosynthesis of auxin.

Auxin is a plant hormone that plays a vital role in the growth and development of plants. It is involved in various processes such as cell elongation, root development, and fruit formation. Auxin is synthesized in the apical meristem and transported to different parts of the plant. Zinc is required for the synthesis and activity of auxin.

Effect of zinc deficiency on auxin biosynthesis:

1. Reduced auxin synthesis: Zinc deficiency can lead to reduced auxin synthesis in plants. This is because zinc is required for the synthesis of tryptophan, which is a precursor for auxin synthesis. Thus, the reduced availability of zinc can lead to a decrease in the synthesis of tryptophan and, subsequently, auxin.

2. Decreased transport: Zinc deficiency can also affect the transport of auxin in plants. This is because zinc is required for the synthesis of the protein PIN1, which is involved in the transport of auxin. Thus, the reduced availability of zinc can lead to a decrease in the synthesis of PIN1 and, subsequently, affect the transport of auxin.

3. Reduced growth and development: The reduced biosynthesis and transport of auxin can lead to reduced growth and development of plants. This is because auxin plays a crucial role in various processes such as cell elongation and root development, which are essential for plant growth and development.

Conclusion:

Zinc deficiency in plants can have detrimental effects on their growth and development. One of the effects of zinc deficiency is the reduced biosynthesis of auxin. Zinc is required for the synthesis and activity of auxin, and its deficiency can lead to reduced auxin synthesis and transport, which can affect various processes essential for plant growth and development.