Cog kev loj hlob regulators muaj ntau hom, txhua tus muaj nws tus kheej lub luag hauj lwm thiab scope ntawm daim ntawv thov. Cov hauv qab no yog qee qhov cog kev loj hlob regulators thiab lawv cov yam ntxwv uas tau pom dav dav kom siv tau yooj yim thiab siv tau zoo:

Cov nroj tsuag kev loj hlob regulators (PGRs) yog cov khoom siv hluavtaws hluavtaws uas muaj tib lub cev muaj zog thiab cov qauv tshuaj zoo sib xws li cov tshuaj hormones endogenous. Cov nroj tsuag kev loj hlob regulator belongs rau ntau hom tshuaj tua kab thiab yog ib chav kawm ntawm cov tshuaj tua kab uas tswj cov nroj tsuag kev loj hlob thiab kev loj hlob, nrog rau cov khoom siv hluavtaws zoo ib yam li cov nroj tsuag cov tshuaj hormones thiab cov tshuaj hormones rho tawm ncaj qha los ntawm cov kab mob.

Auxin yog indole-3-acetic acid, nrog rau cov mis mos molecular C10H9NO2. Nws yog cov tshuaj hormones ntxov tshaj plaws uas pom los txhawb kev loj hlob ntawm cov nroj tsuag. Lo lus Askiv los ntawm Greek lo lus auxein (kom loj hlob). Cov khoom ntshiab ntawm indole-3-acetic acid yog dawb siv lead ua thiab yog insoluble hauv dej. Yooj yim soluble hauv cov kuab tshuaj organic xws li ethanol thiab ether. Nws yog yooj yim oxidized thiab hloov mus rau hauv Rose liab nyob rau hauv lub teeb, thiab nws physiological kev ua ub no kuj txo. Indole-3-acetic acid nyob rau hauv cov nroj tsuag tej zaum yuav nyob rau hauv ib tug dawb lub xeev los yog nyob rau hauv ib tug khi (bound) xeev.

Qhov sib txawv ntawm kev ua: 24-epibrassinolide yog 97% nquag, thaum 28-homobrassinolide yog 87% nquag. Qhov no qhia tau hais tias 24-epibrassinolide muaj kev ua haujlwm siab dua ntawm cov tshuaj sib xyaw ua ke brassinolides.