Organizing co mmittee

ALLELOPATHY OF SOME ESSENTIAL OIL PLANTS FROM 
UZBEKISTAN 
 
S.M. Turaeva, E.R. Kurbanova, Kh.A. Raxmatov 
S.Yu. Yunusov Institute of the Chemistry of Plant Substances Academy of sciences of the 
Republic of Uzbekistan st. Mirzo-Ulugbek, 77, 100170 Tashkent 
e-mail: [e-mail] 
Allelopathy is a biological phenomenon by which an organism produces one or more 
biochemical that influence the germination, growth, survival, and reproduction of other 
organisms. 
The term allelopathy derives from the Greek words "allelon" and "pathos" 
which mean mutually and effect. They refer to the chemical interaction of plants 
through organic secretions. Biogenic secretions are extremely important in the chemical 
interaction of various organisms (from microbes to higher plants), called allelopathy, 
and at various levels of their existence.
Plant allelopathy may result in either accelerated or retarded plant growth. The 
process offers the potential for biological weed control through the production and 
release of allelochemicals from leaves, flowers, seeds, stems and roots of living or 
decaying plant materials. 
Higher plants produce active compounds that promote seedling growth by 
allelopathic inhibition of competitive vegetation. Weeds are permanent components of 
agrophytocenoses and even though the number of weeds is controlled by a man with the 
help of plant protection products and various agricultural practices, in agriculture they 
are a by-product of evolution and occur in varying numbers in cultivated crops. The 
study of the allelopathic effect of weeds on cultivated plants is of great practical 
importance. 
The research aims to study several plant species with allelopathic properties. 
The most interesting is the active secretions (allelochemicals) of higher plants, in 
particular, root exudates, which, entering the environment, can affect representatives of 
both their own and other species growing in the neighborhood. For example, the roots 
of many tree species (oak, maple, ash, etc.) release toxins that inhibit the development 
of both their undergrowth and annual grasses. The spread of the black walnut (Juglans 
nigra) root system, which releases into the soil a substance called juglone, which is a 
respiration inhibitor for plants and eucalyptus (Eucalyptus), can be traced by the 
absence of grass cover.
The allelopathic effect of some essential oil plants against some common weeds that 
grow in fields and horticultural crops is demonstrated by 
Mentha spicata
L., 
Carum 
carvi
L., 
Pimpinella anisum
L., 
Coriandrum sativum
L., 
Foeniculum vulgare
Mill., 
Lavandula stoechas
L., 
Origanum onites
L., 
Rosmarinus officinalis
L. and 
Thymbra 
spicata
L. against some common weeds that grow in field and horticultural crops. 
The discovery of natural allelopathic compounds will reduce the use of synthetic 
herbicides or even replace them with naturally occurring agents for weed control in 
agrosystems.