I-Mesotrione ekhethiwe yokubulala ukhula yokuvikela izitshalo

Incazelo yomkhiqizo

I-Mesotrione iwumuthi wokubulala ukhula omusha owenzelwe ukulawula okukhethiwe ngaphambi nangemuva kokuhluma kokhula olubanzi olunamaqabunga abanzi notshani emmbila (Zea mays).Kuyilungu lomndeni we-benzoylcyclohexane-1,3-dione ye-herbicides, etholakala ngamakhemikhali e-phytotoxin yemvelo etholakala esitshalweni sebhodlela saseCalifornia, i-Callistemon citrinus.Inhlanganisela isebenza ngokuvimbela ngokuncintisana kwe-enzyme i-4-hydroxyphenylpyruvate dioxygenase (HPPD), ingxenye yendlela ye-biochemical eguqula i-tyrosine ibe i-plastoquinone ne-alpha-tocopherol.I-Mesotrione iyi-inhibitor enamandla kakhulu ye-HPPD evela ku-Arabidopsis thaliana, enenani le-Ki elingu-c 6-18 pM.Ithathwa ngokushesha yizinhlobo zokhula ngemva kokufaka amaqabunga, futhi isatshalaliswa ngaphakathi kwezitshalo kokubili ukunyakaza kwe-acropetal kanye ne-basipetal.Ummbila uyabekezelela i-mesotrione njengomphumela wokukhetha kwesitshalo sezitshalo.Ukuthatha kancane kwe-mesotrione, uma kuqhathaniswa nezinhlobo zokhula ezisengozini, kungase futhi kube nomthelela ekusebenzeni kwayo njengesibulala-khula esikhethekile esisetshenziswa emmbila.I-Mesotrione ihlinzeka ngokulawula ukhula olukhulu olunamaqabunga abanzi, futhi ingasetshenziswa ezinhlelweni ezididiyelwe zokulawula ukhula kuye ngesu lomlimi elincanyelwayo lokulawula ukhula.

I-Mesotrione ivimbela i-enzyme 4-hydroxyphenylpyruvate dioxygenase (HPPD).Kuyi-inhibitor enamandla kakhulu ye-HPPD ekuhlolweni kwaselabhorethri kusetshenziswa isitshalo i-Arabidopsis thaliana, esinenani le-Ki elingaba ngu-10 pM.Ezitshalweni, i-HPPD iyadingeka ukuze kwenziwe i-biosynthesis ye-tocopherols kanye ne-plastoquinone, ebalulekile ekukhiqizeni i-carotenoid.I-inhibiton yendlela ekugcineni iholela ekukhanyeni kwamaqabunga njengoba i-chlorophyll yonakaliswa, kulandelwa ukufa kwezitshalo.

I-Mesotrione iwumuthi wokubulala ukhula wangaphambi nangemuva kokuhluma kokuxhumana okukhethiwe kanye nokulawula insalela yokhula olunamaqabunga abanzi embonini yasensimini, ummbila wembewu, i-popcorn ephuzi kanye nommbila omnandi.