commercial uses of plant hormones

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  • commercial uses of plant hormones
    • Auxins
      • taking cuttings
        • by dipping the end of a cutting in rooting powder it encourages new root growth
        • rooting powder contains auxins fungicides and talcum powder
      • seedless fruits
        • by treating unpollinated flowers with auxins this can promote the growth of seedless fruit
        • the auxin promotes the growth of the ovule this triggers other auxins from the tissues of the developing fruits completing the development of seedless fruits
      • herbicides
        • artifichall auxins are used to kill weeds
        • they are transported by the phloem around the plant and none of the enzymes in the weeds can break it down
    • Gibberellins
      • fruit production
        • it extends the time that a citrus fruit can be left on the shelf for
        • it causes grape stalks to extend allowing the grapes to grow bigger
      • gibberellins can be used to accelerate the rate at which break down starches in seeds into malt which is used for brewing
      • sugar production
        • it causes growth between the nodes of the sugar cane causing the stem to elongate
        • this is good because sugarcane stores all of its sugars in the sections between these nodes
      • plant breeding
        • it is used by plant breeders to accelerate the process of seed formation in younger trees
        • seed companies that have to harvest seeds for biennial can add gibbrelens to make them produce seeds in the first year
    • Cytokinins
      • they are used to prevent the yellowing of lettuce leaves
      • they are used to mass produce plants they promote the bud and shoot growth from small samples
        • this grows a small shoot with many branches these branches can then be cut off and used to make lots of smaller plats that can also be grown
    • ethene
      • this is a gas so scientists developed 2 cloroethlyphophonic acid that can be sprayed on the plants
        • this way the ethene can be absorbed by the plant
      • ethene has many uses such as
        • it speeds up fruit ripening
        • promoting the dropping of fruit
        • promoting female sex expression in cucumbers and preventing self pollination
        • promotes lateral growth in some plants yielding compact flowering stems
      • it can also be useful to restrict ethenes effects
        • storing fruit at low temperatures with low oxygen levels but high carbon dioxide levels prevents Ethene synthesis and prevents fruit ripening
        • they can also use other inhibitors of ethene that allow flowers to remain on shelves for longer

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