Browsing by Author "Yildiz, K"

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The Degrees of Repeatability in Walnut (Juglans Regia L) and Their Importance in Selection Breeding
(international Society Horticultural Science, 1997) Akca, Y; Yildiz, K; Sen, SM
This study was carried out to discuss the use of certain nut characteristics as a selection criterion, and reveal the importance of the degree of repeatability in selection breeding. The degrees of repeatability for nut weight (NW), kernel weight (KW), shell thickness (ST), nut length (NL), nut suture (NS) and nut cheek (NC) were found to be high. It has been concluded that the probability of the continuity of the superiority on following years is high for individuals having higher ratings for the above mentioned characters.
Effect of Jasmonic Acid on Yield and Quality of Two Strawberry Cultivars
(Amer Pomological Soc, 2003) Yilmaz, H; Yildiz, K; Muradoglu, F
A low concentration (0.10 mM) of jasmonic acid (JA) did not affect fruit ripening and development in 'Tufts' and 'Cruz' strawberries. However, high concentrations (0.25, 0.50 and 1.00 mM) caused fruits to ripen earlier than the control, significantly increased berry size in the first two weeks of harvest, and increased total yield per plant. No concentration of JAaffected soluble solids concentration or total titratable acidity in either cultivar.
Effect of Jasmonic Acid, Acc and Ethephon on Pollen Germination in Strawberry
(Kluwer Academic Publ, 2002) Yildiz, K; Yilmaz, H
The effects of jasmonic acid (JA), I-aminocyclopropane carboxylic acid (ACC) and 2-cholorethyl phosphonic acid (ethephon) on pollen germination were investigated in strawberry cv. Tufts. ACC and ethephon stimulated pollen germination while JA was inhibitory. Pollen germination was decreased by 0.5 mM JA from 42.5 to 5.8% compared with the control after 4 h of incubation. On the other hand, ACC and ethephon (0.5 mM) increased the pollen germination percentage to 55.6 and 60.7%, respectively. In addition, both ethephon and ACC relieved the inhibition of pollen germination by JA.
The Effect of Soluble Sugars, Total Flavan and Juglone Concentrations in Walnut Scions on Graft Survival
(Amer Pomological Soc, 2003) Yildiz, K; Yilmaz, H; Balta, F
We examined the effects of soluble sugar, juglone and total flavan concentration of scionwood on graft success in walnut (J. regia L). According to simple regression analysis, graft success was linearly related to sugar and juglone concentrations, and quadratically related to flavan concentration. In addition, the best multiple regression model was constructed for graft success according to Al possible regression approach. It was found that the best model included linear terms for flavan and sugar, quadratic term for flavan and the interaction term for flavan x sugar. The r square (R-2) for this model was 0.72, meaning that this model, explained 72% of variation in graft success. The residual variation (28%) resulted from other factors.
Effect of Transplanting Rootstocks Before Grafting on Xylem Exudation and Graft Success in Walnut
(Amer Pomological Soc, 2003) Yildiz, K; Yilmaz, H
The effect of transplanting seedlings before grafting on xylem exudation of seedlings and graft success was studied in early spring grafts of walnut under uncontrolled conditions. Scions of 'Yalova-1' walnut were grafted by the whip and tongue method on one- and two-year-old walnut (J. regia L) seedlings on two dates (15 March and 15 April). Transplanting seedlings did not affect either the amount of xylem exudate or the graft survival on the earlier date (March 15), but decreased the xylem exudation and increased graft survival of two-year-old rootstocks on the later date (April 15). On this date, graft survival percentage of two-year-old rootstocks was increased 20% in 2000 and 25% in 2001 by transplanting seedlings. Xylem sap exudate of two-year-old seedlings - regarded as one of the negative factors for graft success in walnuts, was decreased 2.0 ml in 2000 and 1.3 ml in 2001 by transplanting seedlings before grafting.