18 research outputs found
Influence of the structural and functional characteristics of the seeding material on the yield structure elements and resistance to leaf diseases of spring soft wheat
Received: January 25th, 2021 ; Accepted: November 5th, 2021 ; Published: November 15th, 2021 ; Correspondence: [email protected] high-quality grain use when sowing is a necessary condition for obtaining a high
yield. Along with the standard tests regulated by the ISTA (International Seed Testing
Association), there are promising introscopic techniques for the seed material quality
controlling - methods of microfocus radiography and gas discharge visualization
(electrophotography). The effect of structural and functional characteristics of the seeding
material on the wheat productivity and diseases resistance was studied out on the experimental
field of the Vavilov All-Russian Institute of Plant Genetic Resources. Ten accessions of soft
wheat with the âparametric passportâ (including more than thirty optical parameters, including
gas discharge images, morpho- and densitometric analysis of X-ray patterns) were used as an
experimental seeding material. Unviable wheat seeds, in comparison with healthy ones, were
characterized mainly by a smaller area, form coefficient, standard deviation of three-dimensional
fractality by isoline, entropy by isoline, higher brightness and standard deviation of the isoline
radius of the gas discharge images. Morpho- and densitometric indices of unviable seeds differed
in reduced values of the circle factor, roundness, minimum and maximum average brightness, but
in greater elongation and optical density of the X-ray patterns projection. The intensity of wheat
affection by diseases has varied depending on the structural and functional characteristics of
seeds. It was noted, that the brown rust development decreased with an increase in the entropy by
isoline, the contour irregularity and the average radius of the isoline
The biological basis for the use of protein growth stimulant made from cattle split for wheat foliar feeding and disease suppression
The new modern preparation â protein growth stimulant â was generated in
accordance with technology of employees of Saint-Petersburg ITMO University and SaintPetersburg State Agrarian University. Biological activity of the preparation was determined by
measurements of 20 indicators of the wheat productivity. In addition, 16 indicators of different
types of pathogenesis were determined. These can be formed at distribution of Helminthosporium
root rot, wheat rust species, powdery mildew and wheat leaf blotch. The use of the protein growth
stimulant promoted increase of potential yield in 80% of samples. In comparison with the control,
15 wheat varieties, treated with the preparation, showed an increase in the main productivity
indicators: the length of the spike, the number of spikelets per spike, the weight of 1,000 grains,
the productive tilling capacity and the general bushiness. The intensity of Helminthosporium root
rot development decreased 11.9% (it was found in 53.3% of samples) and the wheat leaf blotch
by 15.6% (in 66.7% of samples). The wheat brown rust development intensity decreased
insignificantly (3.6% compared to the control). In the same time, values of the pathogen pustule
area decreased at average by 79.8%. There was an increase in total nitrogen in wheat leaves at
92% of samples. As was revealed, the effectiveness of the protein growth stimulant largely
depends on the wheat variety. To conclude, the prospect of using the new effective protein growth
stimulant to increase productivity of wheat and protection from diseases was shown
The biological basis for the use of acrylic hydrogel and protein growth stimulant in the soft wheat and triticale cultivation
Received: January 29th, 2021 ; Accepted: November 4th, 2021 ; Published: November 22nd, 2021 ; Correspondence: [email protected] development of technologies for the environmentally friendly biopreparations
production and use including biopreparations based on acrylic hydrogel and protein growth
stimulant, which is obtained by chemical hydrolysis from by-products of slaughtered animals
processing is carried out as part of the optimization of the phytosanitary condition of wheat crops
and creation of favourable agro-ecological conditions for its cultivation. An important feature of
acrylic hydrogel is the ability to retain and release water to plants when needed. At the same time,
protein hydrolysate can provide plants with an additional source of nitrogen which is a component
of plant proteins, chlorophyll and it is necessary for normal growth and development of plants
during the vegetation. The addition of the protein growth stimulant to acrylic hydrogel expands
the potential application of Super Moisture Absorbent (SMA) due to the long-term growthstimulating effect on plants. The acrylic hydrogel and protein growth stimulant were added to the
soil when wheat sowing in the certain concentrations and proportions. Wheat productivity was
studied by the indicators complex, characterized the plants morphological features and the yield
structure. Assessment of the degree of plant affection caused by pathogens was carried out both
according to the generally accepted phytopathological indicator - conditional intensity of
development, and using additional parameters. In the research, it was found that acrylic hydrogel
and protein growth stimulant provide an increase in wheat yield and reduce the pathogens
harmfulness. In combined application, they can be used in agriculture for wheat cultivation as a
low-cost and environmentally friendly soil conditioner
Interface electronic states and boundary conditions for envelope functions
The envelope-function method with generalized boundary conditions is applied
to the description of localized and resonant interface states. A complete set
of phenomenological conditions which restrict the form of connection rules for
envelope functions is derived using the Hermiticity and symmetry requirements.
Empirical coefficients in the connection rules play role of material parameters
which characterize an internal structure of every particular heterointerface.
As an illustration we present the derivation of the most general connection
rules for the one-band effective mass and 4-band Kane models. The conditions
for the existence of Tamm-like localized interface states are established. It
is shown that a nontrivial form of the connection rules can also result in the
formation of resonant states. The most transparent manifestation of such states
is the resonant tunneling through a single-barrier heterostructure.Comment: RevTeX4, 11 pages, 5 eps figures, submitted to Phys.Rev.