Document Type : Research paper

Authors

1 Department of Horticultural Sciences, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran

2 Department of Horticultural Sciences, Guilan University, Rasht, Iran

10.22059/ijhst.2021.321436.456

Abstract

The indeterminate behavior of evening primrose is a frequent limitation in its cultivation. Controlling the final growth of plants at a certain stage is important. In the present experiment, different plant extracts were compared functionally with cycocel at different times of application. The experiment was performed as a factorial experiment based on a randomized complete block design with three replications. Treatments included normal water ‎‎(control), cycocel (zero and 100 ppm), walnut (Juglans regia L.) leaf extract (zero and 25%), oak fruit extract (Quercus castaneifolia L.) (zero and 25%), and cotton capsule extract (Gossypium hirsutum L.) (zero and 25%). Evaluations were made on the seeds, oil yield and yield-components. The foliar application significantly reduced stem length (43-80%) and plant height (13-‎‎33%), but increased the percentage of oils (18.75%) and free fatty acids (67.5%). The highest oil content (35%) occurred in response to a combination of walnut, oak, cotton extracts, and cycocel.‎‏ ‏The highest amount of free fatty acids (23%) indicated more immature‏ ‏seeds and was obtained under the treatment of cotton extract. Natural extracts increased the oil percentage, but reduced ‎the free fatty acid percentage and the stem length. It seems that further studies in this regard can help control non-terminal growth of evening primrose without having a need for breeding programs.

Keywords

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