Odkrivanje tolerance na sušo v mednarodni zbirki genotipov žafranike (Carthamus tinctorius L.) na osnovi izbranih indeksov
Povzetek
Izboljšanje elitnih genotipov žafranike na prenašanje suše ovira pomanjkanje učinkovitih selekcijskih kriterijev. V raziskavi je bilo ovrednoteno 100 genotipov žafranike glede na njihovo prenašanje suše v obdobju treh let (2016–2018) v razmerah brez stresa in razmerah sušnega stresa. Izračunanih je bilo osem indeksov tolerance na sušni stres kot so tolernca na stres (TOL), poprečna produktivnost (MP), geometrijska poprečna produktivnost (GMP), indeks stresne občutljivosti (SSI), indeks stresne tolerance (STI), indeks stabilnosti pridelka (YSI), indeks odpornosti na sušo (DI), in harmonično poprečje na osnovi pridelka semena v sušnih (Ys) in nesušnih (Yp) razmerah. Med preučevanimi genotipi je bila ugotovljena velika genetska variabilnost v toleranci na sušo. Z indeksi MP, GMP, in STI je bilo mogoče razlikovati na sušo tolerantne in občutljive genotipe. Polja prve in druge glavne komponente so določila na sušo tolerantne genotipe v vseh treh letih raziskave. Klasterska analiza je z uporabo indeksov tolerance na sušo razdelila genotipe v tri jasno ločene skupine. Na koncu je bilo ugotovljenih osem genotipov (G3, G11, G13, G24, G33, G47, G58, in G61) različnega izvora, ki so bili bolj tolerantni na sušo in so primerni za uporabo v žlahtniteljskih programih žafranike na od suše ogroženih območjih. Na sušo najbolj prilagojene genotipe žafranike bi lahko uporabili za odkrivanje populacij, ki bi bile primerne pri žlatnjenju žafranike na sušo.
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DOI: http://dx.doi.org/10.14720/aas.2021.117.1.1656
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