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Zaštita bilja
2012, vol. 63, br. 1, str. 29-35
jezik rada: engleski
vrsta rada: naučni članak

Efekat pojedinačnig gena za otpornost prema Puccinia triticina na degradaciju fungicida sa sumporom
Naučni institut za ratarstvo i povrtarstvo, Novi Sad

Sažetak

Sumporne veze su bile istaknute kao moguća mesta dejstva enzima odgovornih za specifičnu otpornosti prema prouzrokovaču lisne rđe (Lr geni), degradaciju proteina pšenice i usporen rast sledećih organa. Pet izogenih linija linija sa specifičnim i jedna sa nespecifičnim genom za otpornost su bile upoređene na osnovu dužina prvog i drugog lista u stadijumu sejanaca osam dana nakon tretmana kontaknim fungicidima koji sadrže vezan sumpor pri različitim koncentracijama. Umanjeni rast je bio potpuno koreliran s većom dozom Dithane M 70 (r=0.93). Lr 16 je najefikasnije razdvajao S=C-S veze u Dithane M 70 i reducirao rast za 20%, dok je uticaj preko Folpana bio svega 3%. Degradacija N-C-S veze u Folpanu preko Lr-a 29 gena bila je najbrža, što je zaključeno preko 17% redukovanog rasta. Pomenuti gen razgradio je i Dithane M 70, 9 ili 5% u zavisnosti od doze. Najviše su se razlikovali rezultati linije nosioca gena za nespecifičnu otpornost Lr 22b (1 i 2%). Efekat ostalih gena bio je intermedijaran 4-7%. Specifični geni Lr 2a i Lr 15 su bili od slabijeg uticaja na oba preparata od prvopomenutih gena dok Lr 1 nije uticao na razgradnju Folpana više od Lr 22b. Četiri grupe Lr gena su bile diferencirane, te funkcija produkata Lr gena bez elicitinog dejstva istih iz gljive dokazana. Praktično, uz prisustvo odgovarajućih gena propisana karenca za Dithane M 70 u semiaridnom regionu od dve nedelje može biti skraćena i odgovarajuća sušnijem regionu u Junu, te primeni na početku bez rezidua.

Ključne reči

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