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    Chilling requirements of cherries grown under subtropical conditions of Adana
    (2012) Kuden, Ayzin B.; Imrak, Burhanettin; Bayazit, Safder; Çömlekçio?lu, Songül; Küden, Ali
    The chilling requirements of different cherry cultivars and the chilling durations of two different cherry growing areas (Pozanti at 1100 m and Adana at 50 m elevations) were investigated. Results depicted that Lapins and Larian gave the lowest (400-450 hours and 94 chill units) chilling requirement. They were followed by Nafrina with 500-550 hours and 120 chill units. Kordia found to be the highest chilling requiring cherry cultivar (700-750 hours and 150 chill units). While, the others were moderate in chilling response. Calculating total growing degree hours, the highest chilling requiring cherry cultivar Kordia needed the least GDH values (14.000 GDH), the others were around 14.00-16.000 GDH. Calculating the hours below 45oF, Pozanti (1100 m elevation) gave 3 or 4 times higher chilling accumulation comparing subtropical conditions of Adana (50 m elevation). However, the chill unit values of Adana and Pozanti were quite similar to each other according to the Richardson's chill units (except 2001-2002-winter period). In comparison of cherry cultivars for dormancy breaking initiation of the buds, Kordia, Larian, Nafrina and Sunburst showed an apical dominancy effect and this effect was the strongest in Sunburst whereas the lightest in Summit. Top cut cuttings of these four cherry cultivars broke dormancy earlier in lateral buds than apical buds. Bud breaks rates of apical and lateral buds in Lapins, Summit and 0900 Ziraat were quite similar to each other. © IDOSI Publications, 2012.
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    COMPARISON OF POLLEN PRODUCTION AND QUALITY CHARACTERISTICS OF CULTIVATED AND WILD ALMOND SPECIES
    (Inst Investigaciones Agropecuarias, 2011) Bayazit, Safder; Caliskan, Oguzhan; Imrak, Burhanettin
    There are several wild almond species in Turkey included Amygdalus orientalis (Mill.), Amygdalus turcomanica (Lincz.), Amygdalus fenzliana (Fritsch) Lipsky, Amygdalus trichamygdalus (Hand.-Mazz.) Woronow, Amygdalus arabica (Olivier), and Amygdalus webbii (Spach). These species offer a great value for the almond improvement; we studied the pollen viability, germination ratio and pollen yield for seven genotypes of A. orientalis, seven genotypes of A. turcomanica all growing under natural conditions in Southeastern Anatolia (Gaziantep and Sanliurfa provinces, Turkey). Almond cultivars (Prunus dulcis [Mill.] D. A. Webb) obtained from Pozanti Agricultural Experimental Station, Cukurova University, were also used in the experiment. The pollen viabilities of various almond genotypes were determined by 2,3,5-triphenyltetrazolium chloride (TTC) and fluorescein diacetate (FDA) tests. At the end, pollen germination ratios were established according to Petri dishes method in vitro conditions (1% agar + 0, 10, 15 and 20% sucrose) while pollen yield was estimated with hemacytometric methods. The results indicated that pollen viability ratios were close to each other in both methods for the genotypes A. orientalis and A. turcomanica. Pollen germination ratios were found to be dependent on the sucrose content as well as on the genotypes used. The pollen of almond cultivars showed similar germination ratios in all of the sucrose concentrations while those pollens of A. orientalis and A. turcomanica genotypes displayed higher germination ratios in 10% sucrose. The number of anthers in one flower was higher in cultivars whereas the number of pollen grains was lower in other almond species. While the number of pollen grains in one flower was relatively high in A. orientalis genotypes, pollen quality was high in all the three species under research. The results suggested that these two species, namely A. orientalis and A. turcomanica could be employed for future almond breeding programs.
  • Küçük Resim
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    Determination of Pollen Production and Quality attributes of some Almond Cultivars (Prunus dulcis) and Selected Wild Almond (Amygdalus orientalis) Genotypes
    (Friends Science Publ, 2012) Bayazit, Safder; Imrak, Burhanettin; Caliskan, Oguzhan
    This study was carried out to establish pollen production, viability and germination ratios for five almond genotypes of Amygdalus orientalis Mill. (Orientalis 5, Orientalis 6, Orientalis 7, Orientalis 9 & Orientalis 10) and four cultivars of Prunus dulcis Mill., (Nonpareil, Texas, Ferragnes & Ferraduel). For determination of pollen viability of selected almond genotypes, 2.3.5 Triphenyltetrazolium chloride and Fluorescent diacetat tests were made. Pollen germination ratios in vitro conditions were determined with petri dishes methods. For A. orientalis genotypes, pollen viability ratios according to the TTC test were found to be 61.80% and 72.88% in 2006 and 2007, respectively whereas the same ratios according to the FDA test carried out in 2006 and 2007 were 63.44% and 57.50%, respectively. The number of anthers in one flower, the number of pollen in one anther and the number of pollen in one flower were found higher in cultivars, whereas these traits turned out to be lower in A. orientalis genotypes. 'Orientalis 6' was notable pollen viability, the number of anthers in one flower, the number of pollen in one anther and the number of pollen in one flower, while the highest pollen germination percentage was recovered from 'Orientalis 9' had in 2006 and from 'Orientalis 5' in 2007. Morphological homogeneity (%) was found to be high in all orientalis types both experimental years. The results obtained with A. orientalis genotypes proved that they could well be employed as pollinizer for hybrid improving work to be made with almond cultivars. (C) 2012 Friends Science Publishers