Abstract:
The purpose of this study was
to evaluate some elements of physiology and
biochemistry in Nepeta racemosa Lam. in
the pedo-climatic conditions of the Moldavian
forest steppe. The parameters were quantified
under conditions of differentiated fertilisation
with three foliar products (KSC 1, KSC 2,
and Corona K). Biochemical analysis by
GC/MS revealed the highest concentration of
the following components: nepetallic acid
(Untreat - 54.33%, KSC 1 - 55.50%, KSC 2 -
56.90%, Corona K - 53.77), eucalyptol
(Untreat . 9.87%, KSC 1 - 10.70%, KSC 2-
12.80%, Corona K - 10.78%), 3-hydroxy-
(4S, 4aS, 7S, 7aS)-dihydronepetalactone
(Untreat - 5.87%, KSC 1 - 5.37%, KSC 2 -
4.87, Corona K - 3.67%), and (4aS, 7S,
7aS)-trans, cis-nepetalactone (Untreat -
4.30%, KSC 1 - 5.00%, KSC 2 - 4.20%,
Corona K - 5.23%). Polyphenols were
present in large quantities in the Corona K
variant, with 33.1 mg GA/g dw at the first
harvest and 27.88 mg GA/g dw at the second
harvest. The highest concentration of
flavonoids was identified in the Corona K
variant (26.34 mg QE/g dw - first harvest
and 56.77 mg QE/g dw - second harvest).
The antioxidant activity was between
14.76 and 38.54% at the first harvest, and
from 12.18 to 22.95% at the second harvest.
Chlorophyll pigments ranged from 13.12-
17.68 μg/ml-1 for chlorophyll a, 5.43-9.66 μg/ml-1 for chlorophyll b, and
2.07-3.34 μg/ml-1 for carotenoids. The
highest grass production per m2 was
achieved in the version fertilised with KSC 1
for both crops, with 986.66 g/m2 for the first
harvest and 861.33 g/m2 for the second.
Iridoids are a class of substances that are
commonly used for pesticide role. The study
aims to highlight these substances and
determine whether differentiated fertilization
influences. The presented data confirm the
results in the literature for polyphenols and
flavonoids, but also present chemotypic
novelties in terms of chemical composition
and represent a direction to follow for future
research.
