Yusuf NİKPEYMA, Mehmet ALMA, Ferudun KOÇER

The Effect of Oleander (Nerium oleander L.) Extracts on Seed Germination and Seedling Growth of Four Pistacia Species

In this study, the effects of the extracts obtained from flower, stem, leaf, branch and their mixture of Nerium oleander L. on the seed germination and seedling growth of four Pistacia species (Pistacia terebinthus L., P. vera L., P. khinjuk Stocks., P. atlantica Desf. and P. terebinthus L.) were investigated. Five hundred grams of N. oleander was taken from the plant parts and the extracts were mixed with distilled water (1.5 L). The extracts were applied to Pistacia species for 24 and 48 hours. The results showed that the extract had positive effects on their germination and growths of the species mentioned above. The highest germination rate for all the Pistacia species was obtained from the extracts of flower, while the lowest germination rate was recorded in the mixture of all parts of N. oleander mentioned above. Moreover, the treatment time was found to reduce the germination ratio. It was also found that the extracts from the stem of N. oleander were the most effective on the stem height of the Pistacia species studied. It was followed by the extracts from branches, leaves and flower, respectively. Furthermore, the findings indicated that the extracts from the stem of N. oleander had pronounced effect on the stem diameter of the Pistacia species studied. It was followed by the extracts from flower, leaves, and branches, respectively. In general, the effects of the extracts from several parts of N. oleander on the germination and other growing parameters were found to be almost comparable to those of synthetic promoter, Gibberellic Acid (GA3).

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