Browsing by Author "Bor, Melike"

Now showing 1 - 3 of 3

NaCl pre-treatments mediate salt adaptation in melon plants through antioxidative system
(ISTA-INT Seed Testing Assoc, 2008) Türkan, İsmail; Bor, Melike; Özdemir, Fethi Ahmet; Sivritepe, Nuray; Sivritepe, Özkan; Uludağ Üniversitesi/Ziraat Fakültesi/Bahçe Bitkileri Bölümü.; DSI-7459-2022; JKM-5097-2023; 6507111971; 6505928088
Seeds of melon (Cucumis melo var. inodorus) cultivars Hasanbey and Kirkagac were primed with 18 dS m(-1) NaCl for 3 days at 20 degrees C. During emergence and seedling growth, non-primed seeds were irrigated with local irrigation water (EC: 0.3 dS m(-1)) whereas primed groups were treated with 9.0 dS m(-1) saline solution for 35 days (seedling conditioning). After transplanting, the seedlings derived from NaCl pre-treated (P) and non pre-treated (NP) groups were irrigated with or without 18 dS m(-1) NaCl solution for a period of 90 days. NaCl pre-treatments diminished inhibiting effect of salinity on plant dry matter production in Kirkagac and induced a significant recovery survival in Hasanbey. NaCl pre-treatments mitigate the negative impacts of salt stress due to increased adaptation of melon plants to NaCl salinity by enhancing chlorophyll content, stomatal conductance and transpiration ill both cultivars. Malondialdehyde (MDA) content decreased in salt-stressed P plants of both cultivars, but was practically unaffected in those of the NP ones. Comparing the response of P and NP plants in both cultivars, NaCl pre-treatments had no effect on SOD activity while they induced APX activity only in Hasanbey. However. NaCl pre-treatments enhanced the activities of CAT, POX and GR in salt-stressed plants of both cultivars. These results suggested that NaCl pre-treatments might be activating antioxidative enzymes. at least in part, thereby controlling overproduction of ROS, hence preventing lipid peroxidation resulting into unproved salt adaptation of long term salinity stressed melon plants.
Response of the cherry rootstock to water stress induced in vitro
(Acad Sciences Czech Republic, 2008-09) Yerlikaya, Cemile; Türkan, Ismail; Bor, Melike; Özdemir, Fethi Ahmet; Sivritepe, Nuray; Ertürk, Ümit; Uludağ Üniversitesi/Ziraat Fakültesi/Bahçe Bitkileri Bölümü.; 7801661220; 6507111971
The in vitro response of sweet cherry (Prunus cerasus x P. canescens) rootstock Gisela 5 to increasing water deficit in the culture medium was studied. Water stress induced by the incorporation of 1, 2 and 4 % polyethylene glycol (PEG-8000) into the Murashige and Skoog medium was applied for 6 weeks. PEG-induced water stress reduced shoot dry mass, length, water content and relative chlorophyll content. Water stress also induced leaf necrosis without causing loss of viability in the explants. The increase in malondialdehyde content indicated oxidative stress. The activities of antioxidant enzymes, such as superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX), peroxidase (POX) and glutathione reductase (GR) were also significantly elevated. The concentrations of K, Ca, Fe and Mn of shoots were decreased.
Responses of the cherry rootstock to salinity in vitro
(Academy Sciences Czech Republic, 2007-09) Yerlikaya, Cemile; Bor, Melike; Özdemir, Fethi Ahmet; Türkan, İsmail; Ertürk, Ümit; Sivritepe, Nuray; Uludağ Üniversitesi/Ziraat Fakültesi/Bahçe Bitkileri Bölümü.; 7801661220; 6507111971
The in vitro response of sweet cherry rootstock Gisela 5 (Prunus cerasus x Prunus canescens) to increasing concentrations of NaCl (0, 50, 100 and 150 mM) in the Murashige and Skoog culture medium was studied. Induced salinity reduced growth and chlorophyll content in shoots but had no effect on water content. The increase in malondialdehyde content indicated that salinity induced oxidative stress which was accompanied with the visible symptoms of salt injury in the shoots. Antioxidant enzymes, such as superoxide dismutase, ascorbate peroxidase, peroxidase, catalase, and glutathione reductase were also significantly elevated. Although no change was observed in the Cl concentration, Na concentration of shoots significantly rose and NaCl treatments impaired K, Ca and Mg nutrition and induced imbalance in K:Na and Na:Ca ratios.