EFFECTS OF SIMULATED ACID RAIN ON IN VITRO
POLLEN PERFORMANCE OF PYRUS COMMUNIS L. AND
MALUS SYLVESTRIS MILLER
AYKUT TOPDEMİR and NAZMİ GÜR
Firat University, Science Faculty Biology Department, 23169. Elazig, Turkey, e-mail: atopdemir@grnail.com; nazmigur@gmail.com
Abstract. Successful fruit set depends on several reproductive processes including pollen germination and lube growth processes. Pollens of ( Pyrus communis I... and Mains sylvestris Miller flowers have been exposed 10 different concentrations of simulated acid rain solutions in range of pHs 6.0 to 2.8. Brawbaker Kwack medium was used for pollen germination. According to the results obtained, germination rate and pollen lube length for each plant at least has been affected at pH 6.0. Pollen germination and tube length significantly decreased with increasing acidity. The decrease of these rales for Malus sylvestris Miller was 99.44% for pollen germination and 99.68% for lube length: and for Pyrus communis 1... 96.23% for pollen germination and 96.75% for lube length at a pH of 2.8. lt has been shown that acidity has a higher effect on blocking Malus sylvestris Miller pollen performance in vitro comparative with Pyrus communis L.
Key words; Acid rain. apple, pear, pollen, germination, tube growth
Rezumat. Efectcle ploii acide simulate asupra stiirii sporilor de polen de Pyrus communis si Malus
srlvestris .Miller. Succesul fructificarii dcpinde de o scric de procesc reproductive ce includ proccsele dc
germinate .si crestcrc a lubului polinic. Sporii de polcn apartinancl speciilor Pyrus communis I. si Malus
svlvestris Miller au tost cxpusi la difcritc concenirahi ale unor solutii dc ploi acide simulate, cu pH-ul
variind intre 6.0 si 2,8. Pentru gcrminarea polcnului a fost folosil un mediu ISrawbaker Kwack, Conform rc/.ultalclor objinute. rata de germinarc si lungimea lubului polimc au fosl eel ma: putin ateciaie la un pi I de 6.0 Aiai rala de germinarc a polenukti, cai si lungimea lubului polinic s-au micsoral considerabil odata cu creslerea acidilatii. Scaderca aceslor rale la Mains svlvestris Miller au lost dc 99,44% m ceea ce priveste germinarea polcnului si dc 99,68% penlru lungimea (ubului polinic. iar pentru Pyrus communis L. a losi de 96,23% pentru germinatia poienului si dc 96,75% pentru lungimea lubului polinic la un pi I de 2.8. Accasia a demonstral ca acidilaiea are un elect mult mai inhibitor asupra slarii poienului in vitro la
Mains svlvestris Miller comparativ cu Pyrus communis L.
