Raziskovanje vključevanja fenolov v obrambne reakcije hortikulturnih rastlin

Ana SLATNAR, Maja MIKULIČ-PETKOVŠEK, Robert VEBERIČ, Franci ŠTAMPAR

Povzetek


Fenolne snovi so spojine, ki niso neposredno vključene v osnovni metabolizem rastlin, vendar imajo v njih številne druge pomembne vloge: (1) služijo kot atraktanti za opraševalce in druge živali, ki so vključene v prenos semen, (2) ščitijo rastline pred herbivori in pred okužbo z glivami in mikrobi, (3) sodelujejo pri kompeticiji rastlina-rastlina in simbiozi rastline z glivami in bakterijami. V pregledu naših raziskav z vidika vloge fenolnih snovi v obrambnem mehanizmu pred različnimi glivami in bakterijami lahko poudarimo, da so fenoli z gotovostjo ena od snovi, s katerimi se rastline odzivajo na okužbo s patogeni. Študije na različnih hortikulturnih rastlinah so pokazale, da odziv na okužbo ni enak pri različnih rastlinskih vrstah. Največkrat prihaja do povečanja koncentracij fenolnih snovi v okolici okužbe. Primerjava zdravega in okuženega tkiva v večini primerov kaže povečanje vsebnosti fenolov v okuženih tkivih pri vseh analiziranih skupinah fenolnih snovi, z izjemo skupine antocianov. Na podlagi povzetkov večletnih raziskav, ki so strnjene v delu, lahko podamo zaključek, da so fenolne snovi vključene v proces obrambe, vendar je odziv rastlin vrstno specifičen.

Ključne besede


Malus domestica Borkh., sadje, zelenjava, okužba z glivami in bakterijami, fenoli

Celotno besedilo:

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Literatura


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DOI: http://dx.doi.org/10.14720/aas.2016.107.1.18

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