Browsing by Author "Yildiz, K."

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Consequences of Nacl Salinity on Growth and Ion Accumulation in Selected Strawberry Cutivars
(int Soc Horticultural Science-ishs, 2008) Yildiz, K.; Uzal, Oe.; Yilmaz, H.
Salt-tolerance of some strawberry cultivars was examined using frigo plants grown in hydroponics. The cultivars 'Tioga' and 'Rapella' were more salt-tolerant than strawberry cultivars 'Camarosa', 'Sweet Charlie', 'Dermarvel', 'Tudla', 'Northester' and 'Douglas'. Vegetative growth in these cultivars was better compared to strawberry cultivars 'Elvira', 'Aiko', 'Camarosa', 'Sweet Charlie', 'Dermarvel', 'Tudla', 'Northester' and 'Douglas' under 100 mM NaCI treatment. Considering vegetative growth parameters, cvs 'Dermarvel', 'Douglas' and 'Camarosa'. Generally, Na accumulation caused by NaCl was higher in sensitive cultivars than in tolerant cultivars. The Ca/Na and K/Na ratios were larger in tolerant cultivars. Malondialdehyde contents of all cultivars increased due to NaCl. Nevertheless, no relationship between malondialdehyde content and salt tolerance of cultivars could be determined.
Effect of Jasmonic Acid on Germination Dormant and Nondormant Apple Seeds
(Chemical Publishing Co., 2007) Yildiz, K.; Yazici, C.; Muradoglu, F.
Jasmonic acid clearly stimulated germination of dormant apple seeds. However, in the seeds stratified for 30 and more days, some concentration of Jasmonic acid seemed as inhibiting, generally, Jasmonic acid was found ineffective. The treatment of seeds with Jasmonic acid not only increased germination level, but also accelerated germination of dormant seeds according to control seeds. On the other hand, Jasmonic acid delayed the germination of seeds stratified for particular period. The retarding effect of Jasmonic acid on germination was clearer in seeds stratified for 90 d. Although Jasmonic acid stimulated germination some degree, but it did not found as effective as stratification under cold condition in removal of dormancy in apple seeds.
The Effect of Jasmonic Acid on Germination of Dormant and Nondormant Pear (Pyrus Communis L.) Seeds
(Ista-int Seed Testing Assoc, 2008) Yildiz, K.; Muradoglu, F.; Yilmaz, H.
Jasmonic acid (JA) stimulated germination of dormant pear (Pyrus communis L.) seeds. Treatment of seeds with JA not only increased germination level, but also accelerated germination of dormant seeds according to control seeds. However, in the seeds stratified for 30 and more days, JA did not change total ratio of germination, but delayed the germination. The retarding effect of JA on germination was larger in seeds stratified for 90 days. Although JA stimulated germination to some degree but it was not as effective as stratification under cold condition in removal of dormancy in pear seeds.
Effect of Salt Stress on Antioxidant Defense Systems, Lipid Peroxidation, and Chlorophyll Content in Green Bean
(Maik Nauka/interperiodica/springer, 2008) Yasar, F.; Ellialtioglu, S.; Yildiz, K.
Salt stress-induced changes in antioxidant enzymes, such as catalase (CAT), ascorbate peroxidase (APX), and glutathione reductase (GR), total chlorophyll content, and lipid peroxidation measured as malondialdehyde (MDA) content, in leaves of a green bean genotype Gevas sirsk 57 (GS57) and cv. Fransiz 4F-89 differing in salt tolerance were investigated. Plants were subjected to three salt treatments (0, 50, and 100 mM NaCl) under controlled climatic conditions for 7 days. The salt-sensitive cv. 4F-89 exhibited a decrease in GR activity at all salt treatments, but the salt-tolerant genotype GS57 showed only a slight decrease in GR under 50 mM salt treatment and an increase under 100 mM salt treatment. CAT and APX activities increased with increasing salt stress in both varieties. CAT and APX activities were higher in the salt-tolerant GS57 than salt-ensitive cv. 4F-89. The two varieties showed an increase in MDA content with an increase in salinity, but the increase in sensitive cv. 4F-89 under salt stress was higher than that in salt-tolerant GS57 genotype. The increasing NaCl concentration caused a reduction in the chlorophyll content in cv. 4F-89 but not in GS57.
Ion Accumulation in Different Organs of Green Bean Genotypes Grown Under Salt Stress
(Czech Academy Agricultural Sciences, 2006) Yasar, F.; Uzal, O.; Tufenkci, S.; Yildiz, K.
Salt-tolerant Gevas Sink 57 (GS57) genotypes and salt-sensitive 4F-89 French variety, previously determined in our preliminary study, were used in the study. The genotype and the variety exposed to 100mM NaCl application developed different mechanisms to be protected against toxic effects of Na+ ion. Salt-sensitive 4F-89 French variety let Na+ accumulate in all organs. On the contrary, salt-tolerant GS57 did not avoid salt and acted selectively among ions; the majority of toxic ion Na+ accumulated in old leaves and shoots and the plants did not transport them into young leaves. K+ accumulation was high in organs in which Na+ concentrations were low, and vice versa; Na+ content was low in young and high in old leaves of GS57, but K+ content was opposite. Ca2+ content in young leaves of GS57 and 4F-89 decreased; still its content was the highest of all examined ions found in young leaves. This indicated that beans can develop different mechanisms to accept and adapt high levels of salt. Storing toxic ion (Na+) in old leaves and having a limited transmission of salt into young leaves serves as a protection from detrimental effects of salt.