Role of new generation plant growth regulators CRP.pptx

generation plant growth regulators

1. ROLE OF NEW GERNERATION PLANT GROWTH REGULATORS IN ENHANCING CROP YIELD ANUJA. A 2021022006

2. Brassinosteroids ( br s ) Brassica napus pollen Brassinolide (1979) P Plant polyhydroxy steroids About 70 BRs have been isolated from plants. Mitchell et al.(1970) reported that stem elongation and cell division were promoted by the treatment of organic extracts of rapeseed pollen. They are biosynthesized from campesterol Structurally they are C 27 -C 28 Brassinolide,Castasterone,24-epibrassinolide are most important BRs because of their wide distribution and potent biological activity ( Bartwal et al.,2013)

3. ROLE OF BRAssinosteroids Promote apical dominance Promote leaf senescence Enhance seed germination Increase the production of ethylene Inhibit the formation of stomata Prevent premature abscission of fruit Increase resistance to freezing Pollen elongation and pollen tube growth

4. Jasmonic acid ( ja ) Jasmonates Linolenic acid Jasmine flower It’s role in plant defence was first shown by Farmer & Ryan (1990) Highest in flowers, reproductive tissues, young leaves and lowest in roots and mature leaves. Methyl jasmonate and cis-jasmone are well known in the perfume industry as fragrant components of the essential oils of jasmine.

5. Role of ja Plant growth and development. Growth inhibition and senescence Flower development Leaf abscission. Wounding of plants Systemic acquired resistance Defense responses against environmental stress Regulate ethylene biosynthesis and Influence aroma volatile Decreased low temperature injuries.

6. SALICYLIC ACID White willow (Salix alba) Colorless crystalline organic acid Systemic Acquired Resistance Cross talk with jasmonates C Ortho- hydroxybenzoic acid Saliciline

7. Role of salicyclic acid Abiotic stress Thermogenesis Seed germination Phenolic compounds exert their influence on physiological and biochemical processes including, photosynthesis, ion uptake ,membrane permeability, enzyme activities, flowering and growth and development of plants. SA is involved in mediating in plant defense against pathogens

8. polyamines Biological compounds and ubiquitous in living organisms. Lower molecular weight. Aliphatic nitrogen groups. At cellular PH values ,acts as cations ( polycationic compound) primary amino groups-NH. They stimulate many reactions involved in the synthesis of DNA, RNA and proteins. Polyamines are essential for all living organisms and without the ability to synthesize polyamines, living cells will not survive.

9. Most frequently found polyamines are: Putrescine Spermidine Spermine Cadaverine

10. Role of polyamines Cell division and root initiation Tuber formation Embryogenesis Flower development Regulate fruit ripening Abiotic stress Reduce PLW

11. PROhexadione -c a Carboxylic group. Anti- gibberellin . It is a mimic of 2-oxoglutaric acid & ascorbic acid Reduces longitudinal shoot growth by blocking. dioxygenases . Reduces alternate bearing. Reduces ethylene formation.

12. 1-MCP Synthetic cyclic oliphene,gaseous PBR. Interacts with ethylene sensitive site. Delays fruit softening and improves quality. Maintains firmness. Decreases storage disorders. Delays chlorophyll degradation.

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