Prohexadione calcium yog cov tshuaj tsis muaj tshuaj lom, tsis muaj cov nroj tsuag ntsuab ntsuab loj hlob uas siv dav hauv cov qoob loo gramineous (xws li mov, nplej, thiab barley) los txhim kho qhov chaw nyob thiab muab ntau yam txiaj ntsig nrog rau kev nce qoob loo thiab txhim kho zoo.
Prohexadione calcium lub mechanism ntawm kev ua thiab cov yam ntxwv:
1. Inhibition ntawm gibberellin synthesis: Los ntawm inhibiting lub biosynthesis ntawm gibberellins (tshwj xeeb tshaj yog GA₁) nyob rau hauv cov nroj tsuag, nws tswj ntau qia loj hlob, shortens internodes, thiab ntxiv dag zog rau stems, yog li no ho txhim kho chaw nyob.
2. Kev txhawb nqa kev loj hlob ntawm kev loj hlob: Thaum inhibiting vegetative loj hlob, nws tsis inhibit gibberellin synthesis nyob rau hauv nplej thiab txiv hmab txiv ntoo, uas yog pab tau rau nce noob nqis npaum li cas, txhiab-grain hnyav, thiab tawm los.
3. Txhim kho kev ntxhov siab: Nws txhim kho cov qoob loo tiv thaiv kab mob (xws li nplej cuav smut thiab nplooj nplooj), drought, tsis kub, thiab tshuaj tua kab puas tsuaj.
4. Ib puag ncig tus phooj ywg: Lub neej luv luv (<24 teev hauv av), nws cov metabolites yog carbon dioxide thiab dej, thiab nws tsis cuam tshuam rau cov qoob loo tom ntej.
