Cog kev loj hlob regulators yog cov khoom ntawm kev sib koom ua ke ntawm ntau yam scientific technologies, nrog rau cov organic synthesis, microanalysis, cog physiology thiab biochemistry, thiab niaj hnub kev ua liaj ua teb, hav zoov, thiab horticulture. Nyob rau xyoo 1920 thiab 30s, cov kab ntawm cov nroj tsuag cov tshuaj hormones xws li ethylene, 3-indoleacetic acid, thiab gibberellins tau tshawb pom hauv cov nroj tsuag, ua lub luag haujlwm hauv kev tswj kev loj hlob thiab kev loj hlob. Los ntawm xyoo 1940, kev tshawb fawb txog kev sib txuas ntawm cov analogues tau pib, ua rau kev txhim kho ntawm 2,4-D, DA-6, chlorpyrifos, sodium nitrophenolate, -naphthaleneacetic acid, thiab thiophanate-methyl, uas tau maj mam nce thiab siv, tsim ib pawg tshuaj tua kab. Nyob rau hauv 30 xyoo dhau los, tus naj npawb ntawm cov neeg cog qoob loo cog qoob loo tau nce zuj zus, tab sis vim qhov nyuaj ntawm lawv cov ntawv thov thev naus laus zis, lawv txoj kev loj hlob tsis tau sai npaum li cov tshuaj tua kab, fungicides, thiab tshuaj tua kab mob, thiab lawv daim ntawv thov teev kuj me dua. Txawm li cas los xij, los ntawm kev xav ntawm kev xav tau ntawm kev ua liaj ua teb niaj hnub, cov nroj tsuag kev loj hlob regulators muaj peev xwm loj hlob zoo, thiab lawv txoj kev loj hlob sai nyob rau hauv 1980s. Tuam Tshoj pib tsim thiab siv cov kev cai cog qoob loo hauv xyoo 1950.
Rau cov hom phiaj cov nroj tsuag, cov nroj tsuag kev loj hlob regulators yog exogenous, tsis yog - tshuaj lom neeg cov khoom noj uas feem ntau yuav translocated nyob rau hauv cov nroj tsuag mus rau lawv qhov chaw ntawm kev ua. Txawm tias muaj tsawg tsawg, lawv tuaj yeem txhawb lossis cuam tshuam qee yam ntawm cov nroj tsuag lub neej txheej txheem, coj lawv mus rau cov txheej txheem uas ua tau raws li tib neeg kev xav tau. Txhua tus kws tswj kev loj hlob ntawm cov nroj tsuag muaj lub hom phiaj tshwj xeeb, thiab nws daim ntawv thov yuav tsum tau ua raws li cov kev qhia tshwj xeeb. Nws tsuas yog tsim cov teebmeem tshwj xeeb ntawm cov hom phiaj cog raws li kev thov tshwj xeeb (nrog rau cov khoom siv sab nraud). Feem ntau, hloov qhov concentration yuav ua rau qhov tshwm sim tsis zoo; Piv txwv li, qhov qis concentration yuav txhawb kev loj hlob, thaum lub siab concentration yuav inhibit nws. Cog kev loj hlob regulators muaj ntau yam siv, txawv nyob ntawm seb ntau yam thiab lub hom phiaj cog. Piv txwv li: tswj budding thiab dormancy; txhawb kev rooting; txhawb nqa cell elongation thiab faib; tswj lateral buds los yog tillers; tswj cov nroj tsuag zoo (luv thiab khov kho kom tsis txhob muaj chaw nyob); tswj flowering los yog poj niam txiv neej, inducing seedless txiv hmab txiv ntoo; thinning paj thiab txiv hmab txiv ntoo, tswj cov txiv hmab txiv ntoo poob; tswj cov txiv hmab txiv ntoo los yog lub sij hawm ripening; txhim kho kev ntxhov siab (kev tiv thaiv kab mob, drought tsis kam, ntsev tsis kam, Frost tsis kam); txhim kho chiv muaj peev xwm nqus tau; nce qab zib cov ntsiab lus los yog hloov acidity; txhim kho aroma thiab xim; txhawb nqa latex lossis resin secretion; defoliation los yog ceev ripening (pab kom txhua yam qoob loo); preservation, thiab lwm yam. Qee cov nroj tsuag kev loj hlob regulators ua herbicides thaum siv nyob rau hauv high concentrations, thaum ib co herbicides kuj muaj kev loj hlob - tswj cov teebmeem ntawm tsawg concentrations.
