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Öğe Fruit morphology of sections of the genus Onobrychis Miller (Fabaceae) and its phylogenetic implications(Laser Pages Publ Ltd, 1999) Yildiz, B; Çiplak, B; Aktoklu, ELn this study, fruit morphology of sections of the genus Onobrychis were examined. Fruit morphology origin, taxonomic position, and phylogeny of the genus are discussed. The hypothesis obtained from a phylogenetic analysis based on fruit morphology suggests the polyphyly of the genus excluding section Dendrobrychis. However, the result supports monophyly of four generic sections, Hymenobrychis + (Heliobrychis + (Lophobrychis + Onobrychis)).Öğe Isoenzyme variation in two allopatric populations of Hedysarum pogonocarpum Boiss. (Fabaceae), a Turkish endemic(Pergamon-Elsevier Science Ltd, 2006) Caliskan, M; Yavuz, A; Aktoklu, EThere are difficulties in the morphological classification of two populations of Hedysarum pogonocarpum Boiss. in Turkey. Isozyme electrophoresis was employed to examine the genetic structure relationships of these two populations of H. pogonocarpum. Alcohol dehydrogenase, malate dehydrogenase and phosphoglycomutase isozymes were analysed by horizontal starch gel electrophoresis among the progeny grown from seeds collected from the Malatya and Kahramanmaras regions where it is the natural range of H. pogonocarpum. Of the four loci identified, ADH, MDH-1, MDH-2, PGM-2, only MDH-2 was monomorphic in both populations. The proportion of polymorphic loci in both populations of H. pogonocarpum was thus 75%, and the average allele number at each locus was 1.8. ADH isoenzymes in both populations were in the Hardy-Weinberg equilibrium, whereas for the MDH-1 locus there was more heterozygosity (P < 0.001) than expected. While the Kahramanmaras population was found to be in the Hardy-Weinberg equilibrium at the PGM-2 locus, the Malatya population displayed considerable deficiency (P < 0.01) in heterozygosity. About 10% of the total genetic variation was due to the interpopulational differentiation. The level of gene flow was found to be 2.05 per generation. Nei's genetic distance coefficient (0.112) and genetic identity (0.888) propose that two populations analysed could be accepted as subspecies of H. pogonocarpum. (c) 2005 Elsevier Ltd. All rights reserved.Öğe The response to exogenous abscisic acid of the roots of notabilis and its wild-type tomato under drought stress(Brill, 2004) Ünyayar, S; Aktoklu, E; Büyükasik, YTo determine whether exogenous abscisic acid (ABA) changes the anatomy of root tissue under stress, an ABA-deficient mutant tomato, notabilis, and its wild type, the cultivar Ailsa Craig, were exposed to drought stress. Plants were grown for four weeks under controlled conditions. Then they were exposed to ABA (10(-5) M) for 6 days under drought or well-watered conditions. Exogenous ABA and/or drought increased the number of xylem vessels in notabilis. Endodermis layer appeared clearly in drought-stressed and/or ABA-treated notabilis. Exogenous ABA increased cambium layers in wild type but drought decreased them. On the other hand, these layers were not visible clearly in ABA-applied notabilis under drought. ABA significantly induced differentiation of pith section of notabilis. The wild type already possesses sclerenchymatic pith section under normal conditions. However, sclerenchymatic pith section only formed in notabilis when ABA was applied under drought stress. It was concluded that exogenous ABA in roots of notabilis resulted in plastic anatomical structures similar to that of wild type under normal conditions and this might result in induction of resistance to soil drying.
