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Learn Introductory Crop Physiology with Braimy – B.SC Agriculture
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Ø Florigen: These hormones are synthesized in the older leaves and then transferred to the growing region where it initiates the floral and bud initiation. It is mainly responsible for flowering in plants. It also called flowering hormones

Ø Anthesins: Its newly discovered hormones responsible for flower formation which horticulturists use to induce the early flowering in some plants.

Ø Vernalin: It is used to undergo and bring vernalization in some plants.

Ø Morphactins: They are synthetic growth regulators which have the various roles and functions as natural growth regulators. It has been effective in flowering stimulation, sequence of flowering, position and number of flowers, formation of flowers, inflorescence parthenocarpy, etc.

Ø Brassinosteroids, are a class of polyhydroxysteroids, a group of plant growth regulators. Brassinosteroids have been recognized as a sixth class of plant hormones, which stimulate cell elongation and division, gravitropism, resistance to stress, and xylem differentiation. They inhibit root growth and leaf abscission. Brassinolide was the first identified brassinosteroid and was isolated from organic extracts of rapeseed (Brassica napus) pollen in 1970.

Ø Salicylic acid — activates genes in some plants that produce chemicals that aid in the defense against pathogenic invaders.

Ø Jasmonates — are produced from fatty acids and seem to promote the production of defense proteins that are used to fend off invading organisms. They are believed to also have a role in seed germination, and affect the storage of protein in seeds, and seem to affect root growth.

Ø Plant peptide hormones — encompasses all small secreted peptides that are involved in cell-to-cell signaling. These small peptide hormones play crucial roles in plant growth and development, including defense mechanisms, the control of cell division and expansion, and pollen self-incompatibility.

Ø Polyamines — are strongly basic molecules with low molecular weight that have been found in all organisms studied thus far. They are essential for plant growth and development and affect the process of mitosis and meiosis.

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