Coban, Furkan; Gül, Volkan; Çakır, Ahmet

Achillea biebersteinii Afan., a medicinal and aromatic plant widely distributed in Türkiye, is valued for its essential oil content and bioactive compounds. This study aimed to investigate the phenotypic variation, yield performance, and essential oil content of A. biebersteinii populations collected from ten different locations in northeastern Türkiye. A total of six morphological and agronomic traits plant height (PH), inflorescence diameter (ID), stem diameter (SD), number of flowering branches (NFB), dry herbage yield (DHY), and dry flower yield (DFY) alongside essential oil content (EO), were evaluated. ANOVA results revealed statistically significant differences among locations for PH, DHY, and NFB, indicating strong environmental or genetic influences. In contrast, EO content showed no significant variation across locations, suggesting greater genetic stability. Correlation analysis indicated a strong positive association between NFB and DHY, while EO content was negatively correlated with PH and SD. Principal Component Analysis further clarified trait associations and revealed distinct groupings among locations, with L9 and L10 showing superior yield performance and L3 standing out for its high EO content. These findings highlight the substantial phenotypic and chemotypic diversity of A. biebersteinii in northeastern Türkiye and underscore the importance of location specific selection in breeding and conservation programs. The identification of high-yielding and high-quality populations provides a valuable resource for sustainable utilization of this species in medicinal and aromatic plant sectors.

İncele

Kubar, Yesim; Kurt, Duygu Baysal; Ketenci, Seyit Taha

Coffee producing countries have large production capacities, but the inefficient use of the income earned from the export of this product may have a negative impact on the economic growth rate. The fact that coffee producing countries are the world leaders in terms of coffee production and exports increases the possibility of the Dutch Disease problem in these countries. This has been the main motivation for investigating the existence of Dutch Disease in coffee-producing countries. In this study, the effect of Dutch Disease in the agricultural sector was analyzed by using the variables of coffee production amount, real exchange rate, GDP (gross domestic product), agricultural added value, exports, foreign direct investments and foreign trade deficit of Brazil, Colombia, Indonesia, Honduras, Mexico, Guatemala, Vietnam, Uganda, India, which produce the best coffee among the coffee producing countries and rank first in terms of production amount for the period 1989-2022. The long-term relationship between the variables was examined using the Pedroni panel cointegration test, and a significant cointegration relationship was found in the panel group. Long-term coefficient estimates were obtained using the Fully Modified Ordinary Least Squares (FMOLS) method. The coefficients were found to be statistically significant in both country-level and panel-level analyses. However, no direct evidence was found to support the existence of Dutch Disease. This finding was supported by the Hurlin panel causality test, which revealed that coffee production and exports did not lead to structural deterioration in the agricultural sector, indicating that no Dutch Disease effect was observed.

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