Pošlji prispevek (e-pošta) Učinek solnega stresa na fiziološki in biokemični odziv treh genotipov koruze v zgodnji razvojni stopnji semenke
Povzetek
Solni stres je eden največjih globalnih problemov za uspevanje gojenih rastlin v sušnih in polsušnih območjih sveta. V raziskavi so bili preučevani nekateri fiziološki parametri, vodni režim in antioksidacijski system v razmerah slanosti (300 mM NaCl) pri treh genotipih koruze (Zea mays L.; ‘P3167’, ‘32K61’, in ‘Bora’). Izsledki so pokazali, da je rast poganjka bolj občutljiva na slanost v primerjavi z rastjo korenin. Solni stres je povzročil fiziološko sušo pri vseh genotipih koruze, ki se je izražala kot značilen upad v relativni vsebnosti vode in povečanju indeksa vodnega deficita. Solni stres je povečal aktivnost SOD pri vseh genotipih, kar kaže na učinkovito razstrupljanje superoksidnega radikala. Stalna raven vsebnosti označevalcev oksidacije (MDA in H2O2) in povečana vsebnost reduciranega askorbata ter fenolov lahko nakazujejo, da so neencimski antioksidanti odgovorni za odpravo oksidacijskega stresa. Spremembe v aktivnosti askorbat peroksidaze in glutation reduktaze v razmerah slanosti so pokazale funkcionalni zlom askorbat-glutationskega cikla, še posebej pri ‘P3167’ in ‘32K61’. Na osnovi predstavljenih izsledkov lahko zaključimo, da je genotip ‘Bora’ toleranten na slanost, medtem ko sta ‘P3167’ in ‘32K61’ občutljiva.
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DOI: http://dx.doi.org/10.14720/aas.2021.117.1.1964
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