Allelopathic effects of the aqueous extract of Rhazya stricta on growth and metabolism of Salsola villosa
Egamberdieva, Abdulaziz A. Alqarawi, Abeer Hashem, Ashwani Kumar, Al-Bandari Fahad Al- Arjani, Elsayed Fathi Abd_Allah, Basharat A. Dar, Stephan Wirth, Kakhramon Davranov & Dilfuza . 2018
ABSTRACT
Allelopathy is a biological process in which plants synthesize allelochemicals that affect the physiological
properties, development and survival of other plants. Experiments were conducted to investigate the
allelopathic effect of Rhazya stricta leaf extracts on the germination, early seedling growth and metabolism
of Salsola villosa. Aqueous extracts (10, 30 and 50 g/ L) decreased germination and growth by reducing the
synthesis of chlorophyll pigments. Leachate treatments induced the antioxidant system by upregulating
antioxidant enzyme activities. Additionally, the activities of phenylalanine ammonia lyase and indole
acetic acid oxidase were stimulated by exposure to leachate. R. stricta leachates reduced the content of
polyunsaturated membrane fatty acids with a concomitant increase in the saturated ones. Unsaturated
fatty acids were reduced with the increased concentration of leachate. Phospholipids were also reduced
due to leachate, thereby affecting membrane functioning considerably. Aqueous extracts from the leaves
of R. stricta restrict the growth and metabolism of S. villosa by hampering membrane functioning and
photosynthetic capacity.
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