Co-inoculation of Anabaena cylindrica and Azospirillum brasilense during initial growth and chloroplast pigments of corn

ABSTRACT Although the isolated effects of the cyanobacteria Anabaena cylindrica and the bacteria Azospirillum brasilense are well-known, the co-inoculation of both can promote other benefits to corn plants’ biological nitrogen fixation and growth. The aim was to evaluate the initial growth and chloroplast pigment levels of corn hybrids co-inoculated with A. brasilense and A. cylindrica. The experiment was conducted in greenhouse conditions using the completely randomized design in a factorial scheme 2 × 4 with two hybrids, Balu 184 and Balu 280 Pro, and four inoculation treatments: no inoculation, inoculation of A. cylindrica, inoculation of A. brasilense, and the co-inoculation of A. cylindrica + A. brasilense. Co-inoculation resulted in higher root growth and dry mass of the aerial part in both hybrids; however, the hybrid Balu 280 Pro presented higher responsivity. The co-inoculation of A. brasilense and A. cylindrica increased initial corn growth without altering the photosynthetic pigment levels.

Similarity between corn hybrids using sanitary and physiological seed parameters

One of the elements capable of explaining the epidemics of diseases in the fields of corn production is the amount of initial inoculum present in seeds. The objective of this paper was to study the health and physiological quality of maize hybrids grown in the 2019 crop. The experiment was carried out using 22 hybrids represented by: 13K21PW Morgan©, 14K185PW Morgan©, 230 PRO 3 DKB©, 290 PRO 3 DKB© , 3040 VIP3 LG©, 3055 VIP3 LG©, 30F35 Pioneer ©, 310 PRO 3 DKB©, 345 PRO 3 DKB©, 8882 Coded DKB, CBS15C385PW Morgan©, CBS15D089PW Morgan©, CBS15SE137PW Morgan©, Coded x40K205 (3898) Pioneer, K9606 VIP3 KWS©, MG580PW Morgan©, MG652PW Morgan©, SH 7930 PRO 2 Sta Helena©, SH 7990 PRO 2 Sta Helena©, SX5885 VIP3 Syngenta©, SX71715 VIP3 Syngenta© and SX8934 VIP3 Syngenta© that were grown in the municipality of Ipameri, GO. Analyzed the percentage of primary root emission (ERP),% of shoot emission (EPA),% of microorganism incidence, % of fungus genera (% GF). Sixteen fungi were detected representing the microflora detected in the seeds of the evaluated hybrids recognized as Penicillium sp., Aspergillus sp., Curvularia sp., Fusarium verticillioides, Gliomastix sp., Cladosporium sp., Gliocladium sp., Bacillus sp., Geotrichum sp. , Trichoderma sp., Mucor sp., Stenocarpela maydis, Pythium sp., Chaetomium sp., Sporotrix sp. and Scopulariopsis sp. The multivariate analysis jointed the cultivars with highest physiological activity represented by SX 8934 Vip3 SYN®, SX 71715 Vip 3®, 3040 Vip3 LG®, SHS 7990 PRO2, SX 5885 Vip3, MG 652 PW®, K9606 Vip3®, DKB 345 PRO3. The lowest incidence of microorganism was in hybrids DKB 345 PRO3 and 8882 cod.

Creation and evaluation of the source material for the selection of erectoid forms of corn

Scientific publications of domestic and foreign scientists are analyzed, new approaches to solving the problem of obtaining the original breeding material of corn are identified. The necessity of creation of lines and hybrids of culture with erectile arrangement of a leaf plate is substantiated. It is confirmed that the primary task of the selection process is to group the collection of samples and obtain starting materials for heterosis selection, in particular, on the basis of CSF. To expand genetic diversity and reduce the period of creation of the original forms, it is advisable to use biotechnological methods. Stable production of corn grain is possible in the presence of hybrids with high potential productivity, resistance to pests, diseases, unfavorable environmental factors that meet the modern requirements of intensive technology. A clear understanding of the improved morphological and physiological type of plants and the elucidation of the biological reasons that limit their productivity in certain environmental conditions, contribute to an increase in the efficiency of using corn hybrids and the profitability of agricultural production. When creating hybrids, it is critical to select the parent components that will ensure their high performance. To conduct heterotic selection, the presence of homozygous lines is necessary. Currently, in order to achieve significant success in maize breeding, great attention must be paid to the creation of new starting material with a wide genetic diversity and in particular with an erectoid placement of the leaf plate. The necessity of creating lines and hybrids of culture with erectoid placement of the leaf plate is substantiated. It was confirmed that the primary task of the breeding process is grouping the collection of samples and obtaining initial materials for conducting heterotic breeding, in particular, based on CMS. To expand genetic diversity and shorten the period for creating initial forms, it is advisable to use biotechnological methods.

Productivity of heterotic of sugar corn hybrids with FAO 280–290 of Right-Bank Forest-Steppe

Change in climatic conditions are is reality the reality of our days. She is accompanied by an increase in air temperature and changes in precipitation. However, in such conditions it is necessary to have sweet corn hybrids that will provide high yields. The spread of sweet corn hybrids is due to the use of its freshly cooked products in the summer. However, the demand for products is constantly increasing for both frozen and canned corn. Therefore, the main guarantee of obtaining a future harvest is the correct choice of a hybrid for cultivation, taking into account soil and сlimatiс conditions. The tests were conducted in the experimental field of Uman NUH in the conditions of the Right-Bank Forest-Steppe in 2021. New maize hybrids (obtained from maternal lines with different mutant genes) were used as test material. Number of studied hybrids – 4. Hybrid Spokusa was used as a standard. During the entire growing season, they were examined for the duration of the growing season and a number of morphological characteristics such as plant height and attachment height of the productive ear. The above listed signs are precisely the genetic feature of the hybrids and their response to changes in air temperature and precipitation. Our research made it possible to isolate a hybrid of corn 1290 (subject to the presence of su1se1 genes in the hybrid genotype), which is attributed to the middle-early ripeness group, and is also characterized by an average plant height of 220 cm and an average ear attachment height permissible for mechanized harvesting – 60 cm. seed productivity at the level of 4.9 t/ha and is characterized by high resistance to damage by corn motile.

Effect of growth stimulants on yield and quality of grain corn grown in Piedmont subprovince of Dagestan

Field experiments were carried out on chestnut soils of Piedmont Dagestan in 2018-2020. Hybrids of grain corn treated with different growth stimulants were the object of еру research. The experiments showed that the harvesting ripeness of hybrids ROSS 299 MV and Mashuk 355 MV occurred 2...5 days earlier after treatment with growth stimulants compared to the control. The growth stimulants used in the experiment did not have a significant effect on seed germination rate. Among the studied hybrids, the highest seed germination were observed in Mashuk 355 MV hybrid. The highest values of leaf area and net productivity of crops were in hybrid Mashuk 355 MB. Plants treated with growth regulators had higher leaf surface by 4.4% and 5.5%; 6.0 % and 8.4%, respectively. Approximately the same dynamics was recorded for photosynthesis net productivity and accumulation of dry matter. Mashuk 355 MV hybrid showed the best yield, which was 30.5; 31.5 and 32.5% higher respectively, compared to the standard. Productivity of corn hybrids treated with growth regulators increased significantly. The highest data were observed on plants treated with Megamiks N10 growth regulator, which were higher than the control data by 30.0 and 32.5%, respectively. Aminokat 30% growth regulator increased corn productivity by 23.7 and 24.7%, respectively. Sufficiently high indicators of yield structure were 10 recorded in Mashuk 355 MV hybrid in the variant with the Megamiks N10 growth stimulator.

Potential of corn hybrids for fresh consumption

The objective of this work was to evaluate the potential of corn hybrids for grain productivity and fresh produce marketability in two crop seasons. The experiment applied the completely randomized block design with three replications, during 2013-14 and 2014-15 crops. Ten hybrids indicated for the Midwest region of Goiás state were used, namely 2B512PW, 2B587PW, 2B707PW, 30F35HR, 30F53YH, BRS1055, BM3061, P3646H and P3862YH. Hybrid AG1051 was used as control. The studied variables were ear height (EH), unhusked ear productivity (UEP), husked ear productivity (HEP), marketable ear productivity (MEP), marketable ear length (MEL), marketable ear diameter (MED), grain mass (GM), and gross revenue (GR). Records show that hybrid P3646H achieved results lower than the control in all the analyzed variables, regardless of the crop season, whereas hybrids 2B512PW, BRS1055 and P3862YH showed figures similar to AG1051 in 2013/14 crop and lower ones in 2014/15. Therefore, would not represent direct market competitors, as the control hybrid holds a significant share in the domestic market. Hybrids 2B587PW, 30F35HR, 30F53YH and BM3061 presented the greatest suitability for fresh corn consumption, as featured the highest number of favorable traits for that market.

ASSESSMENT OF EARLY MATURITY AND PRODUCTIVITY OF NEW CORN HYBRIDS IN THE CONDITIONS OF THE NORTHERN ZONE OF THE MIDDLE VOLGA REGION IN 2020

Evaluation of new breeding samples of early maturing hybrids of the in FSBSI ARRSI of corn 2020 was carried out on an experimental plot with gray forest heavy loamy soils. Meteorological conditions were characterized by an extremely uneven supply of heat and precipitation during the growing season. Of the earliest hybrids, RM 77/18 was isolated with the speed of recoil of moisture by the grain during ripening of 0.88% per day versus 0.64% for the Kubansky 101 standard, as a source of a valuable economic trait. The universal hybrid RM 139/18 surpassed the Nur standard in grain productivity by 10.6%, moisture-yielding speed (1.12% versus 1.02% per day for Nur) and starch content in the grain (57.7% versus 54.6% for Nur). Among the mid-early samples for silage, RM 151/18 stood out: it surpassed the Nur standard in dry matter productivity by 10.8%, output per hectare of crude protein by 35%, sugars - by 15% and metabolizable energy - by 10.6%. Both hybrids are recommended for transfer to State Variety Trials. Analyzed and noted the unreliability of the generally accepted criteria for the preliminary assessment of the early maturity of new maize hybrids in the northern zone of the Middle Volga region.

Seed yield of simple and tri-linear corn (Zea mays L.) hybrids for the mexican humid tropics

The objective of the work was to evaluate the agronomic performance and seed yield of tropical corn (Zea mays L.) of single and tri-linear crosses. In the spring-summer of 2015 and 2016, two essays were established in the states of Veracruz and Tabasco, Mexico. In the first essay, a group of 12 single crosses was evaluated, and in the second, a group of 18 tri-linear crosses was evaluated. In both essays, the treatments were distributed under a completely randomized block design with three replicates in 5 m long, two-row plots and 0.8 m between rows, with an initial population density of 62.500 plants ha-1. Within the simple cross trial, hybrids HE-3W, COMERCIAL 1, LT-164xLT-165, and HE-1W presented seed yields above the general mean (3384 kg ha-1). Within this outstanding group is the LT-164xLT-165 cross, which participates as a female parent in the formation of the recently released commercial hybrid H-567. In the tri-linear crosses essay, a group of varieties and hybrids including H-567, (LT-164xLT-165) xLT-156, (LT-164xLT-165) xLT-155, (LT-154xLT-155) xLT-165, VS-536, H-520, VS-563, (LT-154xLT-155) xLT-170, (LT-171xLT-172) xLT-156, (LT-164xLT-165) xLT-164, and (LT-171xLT-172) xLT-170 recorded seed yields of 6669.8, 6515.4, 6498.6, 6431.1, 6260, 6024.7, 5935.4, 5664.3, 5580.8, and 5527.1 kg ha-1, respectively. The LT-154, LT-155, and LT-156 lines are common as a male and female parent, suggesting a good genetic combination. The prevailing environmental conditions during the development of the experiments did not significantly influence the productivity of the crosses. There is genetic variability that can be used to continue developing lines, open pollination varieties, and corn hybrids.