I-Mesotrione ekhethiweyo yokutshabalalisa ukhula ukukhusela izityalo

Ingcaciso yeMveliso

I-Mesotrione sisitshabalalisi esitsha esiphuhliswayo ukulungiselela ulawulo olukhethiweyo lwaphambi nasemva kokuhluma kokhula olunamagqabi abanzi kunye nengca embonini (Zea mays).Ilungu lentsapho ye-benzoylcyclohexane-1,3-dione ye-herbicides, eyenziwa ngamakhemikhali ephuma kwi-phytotoxin yendalo efunyenwe kwisityalo saseCalifornian bottlebrush, iCallistemon citrinus.I-compound isebenza ngokuthintela okukhuphisanayo kwe-enzyme ye-4-hydroxyphenylpyruvate dioxygenase (HPPD), inxalenye yendlela ye-biochemical pathway eguqula i-tyrosine kwi-plastoquinone kunye ne-alpha-tocopherol.I-Mesotrione yi-inhibitor enamandla kakhulu ye-HPPD esuka kwi-Arabidopsis thaliana, enexabiso le-Ki le-c 6-18 pM.Ithatyathwa ngokukhawuleza ziintlobo zokhula emva kokugalelwa kwamagqabi, kwaye isasazwa phakathi kwezityalo yi-acropetal kunye ne-basipetal movement.Umbona uyayinyamezela i-mesotrione njengesiphumo sokukhetha ukutya okwenziwa sisityalo.Ukufunxwa kancinane kwe-mesotrione, xa kuthelekiswa neentlobo zokhula ezichaphazeleka lula, kusenokuba negalelo ekusetyenzisweni kwayo njengesitshabalalisi esikhetha ukusetyenziswa embona.I-Mesotrione ibonelela ngolawulo lokhula olukhulu olunamagqabi abanzi, kwaye ingasetyenziswa kwiinkqubo ezidibeneyo zokulawula ukhula ngokuxhomekeke kwisicwangciso somlimi esithandwayo sokulawula ukhula.

I-Mesotrione inqanda i-enzyme ye-4-hydroxyphenylpyruvate dioxygenase (HPPD).Yi-inhibitor enamandla kakhulu ye-HPPD kuvavanyo lwaselabhoratri kusetyenziswa isityalo i-Arabidopsis thaliana, ngexabiso le-Ki elimalunga ne-10 pM.Kwizityalo, i-HPPD iyimfuneko kwi-biosynthesis ye-tocopherols kunye ne-plastoquinone, eyimfuneko kwimveliso ye-carotenoid.Inhibiton yendlela ekugqibeleni ikhokelela ekubeni amagqabi abe mhlophe njengoko iklorofili yonakala, kulandele ukufa kwezityalo.

I-Mesotrione sisichiza sokutshabalalisa ukhula ngaphambi nasemva kokuhluma koqhagamshelwano olukhethiweyo kunye nokulawula okushiyekileyo kokhula olunamagqabi abanzi kumbona wasendle, umbona wembewu, ipopcorn emthubi kunye nombona oswiti.