تاثیر سیلیکون بر ویژگی های کمی و فیزیولوژیک گاوزبان اروپایی (Borago officinalis L.) تحت رژیم های آبیاری

In order to investigate the effects of irrigation regimes and foliar silicon spraying on quantitative and physiological characteristics of borage (Borago officinalis), an experiment is conducted as split plot based on randomized complete block design with three replications during ۲۰۱۴ at the University of Zabol research farm in Zahak. Treatments include irrigation regimes at three levels; (۹۰%, ۷۰%, and ۵۰% FC) comprising the main-treatments and four levels of silicon sprying including spraying in the form of sodium silicate (Na۲SiO۳) (۰, ۲, ۴, and ۶ mM) as sub-treatments. The results indicate that the highest amount of proline is obtained from the interaction of irrigation regime with ۵۰% of field capacity, without the use of silicon at the rate of ۰.۷۸۴۷ mg.g-۱. Based on the results of average comparison, the highest amount of chlorophyll a (۱۵.۹۱۹ mg/g fresh weight), chlorophyll b (۷.۱۴ mg/g fresh weight), from the interaction of irrigation regime ۷۰% of field capacity and application of ۲ mM silicon, as well as number of flowers per plant, total dry yield of plant (۵۲۰ kg.ha-۱) and biological yield (۱۱۸۷ ۵۲۰ kg.ha-۱) Per hectare), ۷۰% and ۵۰% of field capacity and application of ۶ mM silicon are obtained from the interaction effect of irrigation regime, respectively. Overall, the results suggest that silicon application mitigate drought stress impact and led to increasing drought tolerance of borage. Since flower and flowering branches of plant has economic value and application of ۴ mM silicon acid is recommended to obtain the greatest flower yield under drought stress conditions.

Keywords:

پرولین , عملکرد بیولوژیک , عملکرد گل , کاروتنوئید , کلروفیل