Fruit Growth Characteristics of Rose Hips (Rosa sp)

This study was carried out to determine the fruit growth characteristics of two rose hip (Rosa) species selected from wild population in Tokat region of the Northern Anatolia, Turkey. Shrubs were propagated by cuttings and planted in 2000 at the Research Station of the Horticultural Department of Agricultural Faculty of Gaziosmanpaşa University, Tokat, Turkey. Fruit weight, fruit diameter, fruit length, fruit flesh percentage and seed weight of genotypes belonging Rosa dumalis and Rosa jundzillii were investigated in the study. Fruit samples were picked up weekly from full flowering to optimal harvest time for measurement and weighing. As a result, fruit development characteristics of species measured exhibited single sigmoidal curve except seed weights. In general, developing of measured properties were fast until last 3-4 weeks, then became stable or slightly decreased. Results obtained in 2011 were higher than the results obtained in 2010 in both genotypes

Effects of Harvest Times on the Fatty Acids Composition of Rose Hip (Rosa sp.) Seeds

This study was conducted to determine the change of fatty acids ratios of some rose hip species seeds in different harvest times. Seeds of five genotypes belonging to rose hip species (Rosa sp.) were used in the study. The fruits of species were harvested in six different ripening times and analyzed. Total oil analysis was performed for the fifth harvest only, which was determined as the optimal harvest time. As a result; total oil ratio of rose hip seeds varied as 5.22 and 6.62 g/100g respectively for accessions of Rosa dumalis (MR-12 and MR-15), 6.37 g/100g for R. canina (MR-26), 5.00 g/100g for R. dumalis ssp. boissieri (MR-46) and 5.29 g/100g for R. villosa (MR-84). Eleven fatty acids were determined in rose hip seeds. Among these fatty acids linoleic, oleic, linolenic, palmitic and stearic acids respectively had high ratio. Saturated fatty acids ratio (SFAs) was the highest in R. canina (MR-26) and the lowest in R. dumalis (MR-12); monounsaturated fatty acids ratio (MUFAs) was the highest in R. dumalis (MR-12) and the lowest in R. dumalis ssp. boissieri (MR-46); polyunsaturated fatty acids ratio (PUFAs) was the highest in R. dumalis ssp. boissieri (MR-46) and the lowest in R. dumalis (MR-12). Mono and polyunsaturated fatty acid contents obtained in this study was high; the change of fatty acid profile in the studied species in relation to harvest time was significant for some species and insignificant for others. A conclusion was reached that it is important to pay attention to qualitative and quantitative properties of seeds when conducting studies about rose hip improvement