Growth Hormones regulators and plant hormones

Growth Hormones regulators
Plant harmones

1. New Plant Growth Regulators Presented by: Muhammad Kashif Group members: Miss Anam & Miss Fakhra

2. Strigolactones Strigolactones (SLs) are carotenoid-derived signaling molecules and plant hormones Strigolactones were first isolated in 1966 from cotton plants. Strigolactones are produced by Angiosperms, gymnosperm including psilotophytes and lycopods and some mosses Strigolactones (SLs) are involved in multiple physiological activities, metabolisms, and root formation and architecture, control shoot branching and promotion of leaf senescence

3. Fig 1 Strigolactones are a class of phytohormones shaping the overall plant structure.

4. Systemin Systemin is the only peptide possessing hormone-like activity in plants It was discovered in Rayn’s laboratory in 1992 The main function of systemins is to coordinate defensive responses against insect herbivores but they also affect plant development.

5. Fig.2 Structural formula of systemin in tomato plants.

6. Alpha tocopherols Alpha-tocopherol (α-Toc) is a member of the vitamin E family and is lipid soluble. Α lpha -Toc plays a key role in a variety of plant metabolic processes. It can maintain the integrity and fluidity of photosynthesizing membranes. Alpha-Toc has been widely reported as a potential means of promoting resistance in plants to a variety of stressful environments

7. (2 R )-2,5,7,8-Tetramethyl-2-[(4 R ,8 R )-4,8,12-trimethyltridecyl]-3,4-dihydro-2 H -1-benzopyran-6-ol

8. Fusicoccin Fusicoccin produced by Fusicoccum amydali fungus It stimulate the tolerance system of plants under stress conditions. Fusicoccin is a glycoside, It stimulates proton pumping across plant plasma membranes

9. Fig:3 Fusicoccin Shares a 5-8-5 ring structure and is called fusicoccane

10. Tricontancol Triacontanol is a fatty alcohol of the general formula C₃₀H₆₂O F ound in plant cuticle waxes and in beeswax. It is used on millions of hectares to increase agricultral production.

11. Triacontanol has been reported to increase the growth of plants by enhancing the rates of photosynthesis, protein biosynthesis, the transport of nutrients in a plant and enzyme activity, reducing complex carbohydrates among many other purposes.

12. Turgorins Turgorins are a group of gallic acid It is involved in leaf movement and nyctinasty They are agents that play uncharacterized roles during temperature and wounding stress.

13. Reference Pearce G., Strydom D., Johnson S., Ryan C.A. A Polypeptide from Tomato Leaves Induces Wound-Inducible Proteinase Inhibitor Proteins.  Science.  1991;253:895–897. doi: 10.1126/science.253.5022.895.  Aitken, A. (1996). 14-3-3 and its possible role in co-ordinating multiple signaling pathways. Trends Cell Biol. 6, 341–347. doi: 10.1016/0962-8924(96)100