Abstract
In this study, 90 locally grown cucumber (Cucumis sativus L.) landraces were collected and morphologically characterized using 20 descriptors derived from UPOV (International Union for the Protection of New Varieties of Plants). Genetic diversity and relationships of the genotypes were revealed using 20 sequence-related amplified polymorphism (SRAP) marker combinations. The discrimination power of each polymorphic marker (estimated by the polymorphism information content) ranged from 0.15 to 0.99 with an average of 0.73. Dice's similarity coefficient ranged between 0.00-1.00. The cluster analysis that was conducted using the unweighted pair group method of arithmetic averages (UPGMA) for both molecular and morphologic data showed that all of the genotypes fell into two main groups and many subdivisions. According to morphological data, fruit length, diameter and weight of the genotypes were determined between 6.5 - 32.5 cm, 25 - 52 mm and, 28 - 625 g respectively. It is clear from the results, a moderate level of genetic diversity, which has the potential for broadening the genetic base, was observed among the Turkish cucumber landraces.
Highlights
Cucumber (Cucumis sativus L.) is grown widely in open field or glasshouse conditions
Morphological observations of 47 genotypes using 10 Union for Protection of New Plant Varieties” (UPOV) descriptors were presented in Table 4 as an example
90 of the local cucumber genotypes grown in different regions of Turkey were collected and morphologically characterized considering the 20 UPOV descriptors
Summary
Cucumber (Cucumis sativus L.) is grown widely in open field or glasshouse conditions. India is the primary center of diversity for cucumber (Wehner and Robinson, 1991) It has a narrow genetic base with a genetic variability of 3-8% so it is more susceptible to biotic and abiotic stresses (Rao and Hodgkin, 2002). Local landraces have adaptation skills to shifting climatic conditions They have been a major resource for crop breeding, due to their tolerance to the extreme climate changes and the resistance to some pests and diseases (Rao and Hodgkin, 2002). Their genetic and phenotypic features need to be characterized carefully for the proper use in breeding programs (Parisi et al, 2017). The success of any plant breeding program depends on the genetic
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