scholarly journals About the creation of sterile lines of sweet pepper in breeding for heterosis

2020 ◽  
pp. 38-42
Author(s):  
S. V. Koroleva ◽  
N. V. Polyakova ◽  
O. G. Pistun
Keyword(s):  
Temperature Regime ◽  
Growing Season ◽  
Sweet Pepper ◽  
Effective Control ◽  
Climate Chamber ◽  
The Third ◽  
Rf Gene ◽  
Research Material ◽  
Partial Fertility ◽  
Adult Plants

Relevance. Development of valuable sterile lines of sweet pepper using nuclear-cytoplasmic male sterility is associated with the search for stable sterility maintainers in collection material.Material and methods. The purpose of the research is to optimize the identification of the desired genotypes and accelerate the development of sterile lines using artificial climate chambers. The research material was a sterile line msTol55, which under the conditions of a film greenhouse showed partial fertility at the beginning or at the end of the growing season. The place of cultivation is artificial climate chamber, a film spring greenhouse.50-day-old seedlings were planted in pots on 10.01, the period of growing plants in the chamber - until 20.04, then the adult plants were transplanted into a spring film greenhouse. According to the traditional technology, the cassette seedlings of the same line were planted in the greenhouse on 15.04. The number of tested plants is 16-20 pcs. Growing mode in the chamber: 12 hours were illuminated with DRLV lamps, while the temperature was at the level of 26-28°C, from 20.00 to 8.00 the lamps were not illuminated, the temperature was 14-15°C. The actual sterility / fertility of the flowers was determined by the level of contamination of the fruits at the beginning of their formation.Results. The maintained temperature regime for growing in an artificial climate chamber made it possible to identify sterile (30%) and partially fertile plants (70%) in the first 2 weeks of flowering. When adult plants were transplanted into a spring greenhouse, the number of sterile plants increased to 56%. When growing the line msTol55 in a spring greenhouse using the usual technology, partial setting of seeded and little seeded fruits on 60% of the plants was observed from the third decade of May to the second decade of July, then all plants set only non-seeded fruits. Based on the results obtained, it is advisable to identify the breeding material for the Rf gene in the ACC, since the proposed growing regime serves as a provocative background and allows for more effective control over the manifestation of sterility.

Work seniority as a determinant of employment intensity

2015 ◽  
Vol 60 (8) ◽  
pp. 49-65
Author(s):  
Beata Bieszk-Stolorz
Keyword(s):  
Event History Analysis ◽  
Event History ◽  
Hazard Rates ◽  
Employment History ◽  
Unemployed People ◽  
The Third ◽  
Research Material ◽  
History Analysis ◽  
Intensity Changes ◽  
The Relationship

The purpose of this article is to analyse the intensity of unemployment leaving in relation to the length of an unemployed person’s work seniority. A hypothesis was made that its intensity changes depending of that person’s employment history and on its gender as well as education. The research material consisted of individual data of 21,398 unemployed people registered by the Poviat Labour Office (PUP) in Szczecin in 2012 and observed throughout 2013. The author used the event history analysis, which was conducted in three steps. First, the author assessed the likelihood of remaining unemployed depending on the unemployment period. Secondly, she divided the registered unemployed into groups according to their employment history and determined the relationship between the employment intensity and the span of time when the members of those groups remained registered in PUP. In the third step, she used the average hazard rates to compare the intensities of unemployment leaving in individual groups.

SOIL CONDITIONERS—THEIR EFFECT ON COARSE-TEXTURED SOILS, CROP YIELDS AND COMPOSITION

1957 ◽  
Vol 37 (2) ◽  
pp. 102-112
Author(s):  
R. M. Holmes ◽  
S. J. Toth
Keyword(s):  
Structural Changes ◽  
Crop Yields ◽  
Cultural Practices ◽  
Sandy Soils ◽  
Growing Season ◽  
Soil Aggregate ◽  
Crop Response ◽  
The Third ◽  
Soil Conditioners ◽  
The Stability

Crop response to soil structural changes caused by soil conditioner amendments was studied in several different sandy soils of New Jersey. The response varied with the crop and treatment. Those chemicals that were slightly hydrophobic were most effective and generally crop response was greatest on these treatments. Cations such as Na may be added in large amounts as part of some conditioners, and this may result in reduced uptake of other nutrients such as Mg. and K. Except for this effect, conditioners did not reduce nutrient uptake by plants. When elements such as Na and N are added in large amounts as part of some conditioners, there may be an increased uptake of these nutrients.Catalin and VAMA conditioners produced a dry surface mulch which appeared to reduce evaporation. Moisture reserves were, therefore, preserved through a drought and this resulted in increased growth of crops over those grown on other treatments. Cultural practices destroyed the stability of the conditioned aggregates, since in most cases the effect had largely disappeared by the third growing season. Chemicals which were effective in soil aggregate stabilization were also effective as anti-crustants when crusting was a problem.

scholarly journals Assessing the impact of widespread respirator use in curtailing COVID-19 transmission in the USA

2021 ◽  
Vol 8 (9) ◽  
pp. 210699
Author(s):  
Calistus N. Ngonghala ◽  
James R. Knitter ◽  
Lucas Marinacci ◽  
Matthew H. Bonds ◽  
Abba B. Gumel
Keyword(s):  
Dynamic Models ◽  
Effective Control ◽  
Natural Immunity ◽  
Third Wave ◽  
Respiratory Protection ◽  
The Third ◽  
Surgical Masks ◽  
The Usa ◽  
Baseline Levels ◽  
The Impact

Dynamic models are used to assess the impact of three types of face masks (cloth masks, surgical/procedure masks and respirators) in controlling the COVID-19 pandemic in the USA. We showed that the pandemic would have failed to establish in the USA if a nationwide mask mandate, based on using respirators with moderately high compliance, had been implemented during the first two months of the pandemic. The other mask types would fail to prevent the pandemic from becoming established. When mask usage compliance is low to moderate, respirators are far more effective in reducing disease burden. Using data from the third wave, we showed that the epidemic could be eliminated in the USA if at least 40% of the population consistently wore respirators in public. Surgical masks can also lead to elimination, but requires compliance of at least 55%. Daily COVID-19 mortality could be eliminated in the USA by June or July 2021 if 95% of the population opted for either respirators or surgical masks from the beginning of the third wave. We showed that the prospect of effective control or elimination of the pandemic using mask-based strategy is greatly enhanced if combined with other non-pharmaceutical interventions (NPIs) that significantly reduce the baseline community transmission. By slightly modifying the model to include the effect of a vaccine against COVID-19 and waning vaccine-derived and natural immunity, this study shows that the waning of such immunity could trigger multiple new waves of the pandemic in the USA. The number, severity and duration of the projected waves depend on the quality of mask type used and the level of increase in the baseline levels of other NPIs used in the community during the onset of the third wave of the pandemic in the USA. Specifically, no severe fourth or subsequent wave of the pandemic will be recorded in the USA if surgical masks or respirators are used, particularly if the mask use strategy is combined with an increase in the baseline levels of other NPIs. This study further emphasizes the role of human behaviour towards masking on COVID-19 burden, and highlights the urgent need to maintain a healthy stockpile of highly effective respiratory protection, particularly respirators, to be made available to the general public in times of future outbreaks or pandemics of respiratory diseases that inflict severe public health and socio-economic burden on the population.

scholarly journals FEATURES OF BRASSICA RAPA'S GROWTH AND DEVELOPMENT, DEPENDING ON THE TERRITORY OF SOWING THE SEED

2019 ◽  
pp. 183-194
Author(s):  
Serhii Vdovenko
Keyword(s):  
Seed Germination ◽  
Soil Temperature ◽  
Growth And Development ◽  
Total Yield ◽  
Growing Season ◽  
Vegetation Period ◽  
Row Spacing ◽  
The Third ◽  
Golden Ball ◽  
And Control

In order to study the effect of the time of sowing seeds on the passage of morphogenesis and productivity of rapeseed, the scheme included experiments where the seeds were sown in I, II, III in April, I and II in May. The experiment used varieties of Golden Ball, Purpurleopop, Purpurov and Geisha, and control was the variant in which the seeds of the Golden Ball varieties were sown in the second decade of April with a row spacing of 45 cm. laboratory - to determine the total yield; statistical - to establish the reliability of the investigated factors. Seed germination analysis used in the experiment ranged from 78.9% to 81.1% on average. The highest indicator of seed germination was characterized by the Purpulepop variety, where the studied value was 83.2%, which was dominated by the seed germination of the control variant by 2.1%. In the early stages of sowing seeds, the period of seedling formation was shorter. Seeding of seeds in the first two decades of April on the surface of the soil was observed for 8 days. The short sprouting period was characterized by all varieties of turnips. As a result of sowing turnip seeds at a later date, namely in the third decade of April - the first and second decade of May and the setting of a higher soil temperature, the period of germination was extended and ranged from 8 to 10 days. By using the term of sowing seeds I-II decade of April, the short interphase period was characterized by Purpleupop and Purpurova varieties, where the specified period was only 22 days. The sowing of turnip seeds at a later date ensured the formation of an interphase period of "seedlings - leaf rosette" in 23-25 days except Purpulopop variety. The interphase period "leaf rosette - the beginning of rooting" and "the beginning of rooting - technical maturity" determined the benefits of early seeding, namely in the first decade of April on varieties Purpulopop and Purpurov.The short vegetation period was characterized by the Golden Ball plants for sowing seeds in the first and third decades of April and the first of May. During the specified seeding period the duration of the growing season was only 40 days. A longer vegetation period was characterized by plants of the Geisha variety for sowing seeds in the first two decades of April. As a result of the use of the researched elements of technology to grow turnips in open soil, the total yield varied from 11.0 t / ha to 24.0 t / ha. The most productive is the first sowing of rapeseed, where its value ranged from 20.6 t / ha to 22.7 t / ha. At the same time, when sowing seeds in the first decade of April, the yield of turnip varieties Purpulepop was the highest and was 22.7 t / ha, or the increase was 2.4 t / ha.

CONTROL OF ROOT MAGGOTS ATTACKING CRUCIFEROUS CROPS, MAINLY RUTABAGAS, GROWN IN RIDGES

1960 ◽  
Vol 40 (4) ◽  
pp. 721-728
Author(s):  
D. C. Read
Keyword(s):  
Prince Edward Island ◽  
First Generation ◽  
Chlorinated Hydrocarbons ◽  
Growing Season ◽  
The Other ◽  
Effective Control ◽  
Complete Control ◽  
Root Maggot

Experiments in 1958 and 1959 with pre-planting soil treatments of insecticides, applied in a 5-inch band [Formula: see text] below the seed in ridges of soil, snowed that heptachlor, aldrin and chlordane, each at 5 pounds toxicant per acre, gave 70 to 90 per cent reduction in root maggot damage in cruciferous crops in Prince Edward Island. Each of these insecticides gave better control of the second than of the first generation of root maggots. Nematocide 18,133, at 5 and at 10 pounds per acre gave complete control throughout the growing season and also gave the highest yield. Thimet at 5 and at 10 pounds gave better control than the chlorinated hydrocarbons; parathion and Guthion, at the same rates, gave better control of the first generation but not as effective control thereafter. Korlan at 6 pounds gave fair control of the first generation but was ineffective thereafter. Ethion, Trithion, Di-syston and Diazinon, each at 5 and at 10 pounds, and Co-Ral and Dylox at 5 pounds were ineffective in controlling root maggot injury. Diazinon was highly phytotoxic; none of the other insecticides showed any phytotoxicity.

EFFECT OF MAGNESIUM AND POTASSIUM FERTILIZATION ON A 20-YEAR-OLD RED PINE PLANTATION

1965 ◽  
Vol 41 (3) ◽  
pp. 290-294 ◽  
Author(s):  
J. D. Gagnon
Keyword(s):  
Beneficial Effect ◽  
Pinus Resinosa ◽  
Growing Season ◽  
Red Pine ◽  
Pine Plantation ◽  
The Third ◽  
Potassium Fertilization ◽  
Current Growth

The fertilizers, Mg at a rate of 100 lbs/acre and K at 200 lbs/acre, were applied around each of 15 red pine (Pinus resinosa Ait.) to promote increased growth in a 20-year-old plantation which had failed to fulfil growth expectations. Successive measurements of diameter and height showed that the fertilizers stimulated diameter significantly after the second growing season, but height only after the third growing season. Beneficial effect of fertilizer applications on diameter and height persisted, and the differences in diameter and height between treated and untreated trees at the end of the seventh growing season was equivalent to two years' current growth.

Early Results of a White Ash Provenance Test in Central Alabama

1981 ◽  
Vol 5 (2) ◽  
pp. 65-67 ◽  
Author(s):  
S. E. Duba ◽  
J. F. Goggans ◽  
K. E. Clausen ◽  
R. M. Patterson
Keyword(s):  
Baton Rouge ◽  
Growing Season ◽  
Height Growth ◽  
National Forest ◽  
White Ash ◽  
The Third ◽  
Early Results ◽  
Provenance Test ◽  
The Family ◽  
Family Survival

Abstract A provenance test of white ash (Fraxinus americana L.) seedlings was established during January 1976 in the Tuskegee National Forest in Alabama. The seedlings were representative of the southern portion of the species' range. At the end of the third growing season, family survival ranged from 84 to 100 percent. Overall survival averaged 97 percent. Provenances and families within provenances differed in height after two and three years in the field. The family component of variation is increasing in proportion with age. The southernmost origins of East Baton Rouge, Louisiana (3.26 m) and Hardin, Texas (2.98 m) had the tallest average heights. The East Baton Rouge and Hardin sources are assumed to be tetraploid (2N = 92). There seems to be both a north-south relationship and a ploidy-level relationship to the height-growth pattern. Seedlings from the southernmost sources should perform satisfactorily in south and central Alabama.

Best Practice Diplomacy and Feminist Killjoys in the Strategic State: Exploring the Affective Politics of Women, Peace and Security

2020 ◽  
pp. 83-90
Author(s):  
Minna Lyytikäinen ◽  
Marjaana Jauhola
Keyword(s):  
Best Practice ◽  
Action Plan ◽  
Foreign Affairs ◽  
Ethnographic Research ◽  
National Action Plan ◽  
The Third ◽  
State Feminism ◽  
Research Material ◽  
Multi Stage ◽  
Peace And Security

“And then I sNAPped”. How does it feel to snap at the Ministry for Foreign Affairs, at a meeting taking stock of the progress of the UNSCR1325 National Action Plan? This paper is a response to the affective sites of Women, Peace and Security politics and the ways in which academic/activist knowledge has become (un)used by the strategic state. We identify moments of feminist killjoyism, which we call sNAPping, in the context of the wider transition from state feminism to the need to engage with the neoliberal governmentalities of the strategic state”. Our contribution is an auto-ethnographic reflection by two researcher-activists who participated in the multi-stage government-led process of drafting and launching the third Finnish UNSCR1325 National Action Plan and were also the authors of three key advocacy texts. We have used our experiences in such encounters as ethnographic research material to interrogate and analyse the feminist affects of sNAPping.

scholarly journals Infection Courts and Timing of Infection of Apple Fruit by Phacidiopycnis washingtonensis in the Orchard in Relation to Speck Rot During Storage

Plant Disease ◽  
2014 ◽  
Vol 98 (11) ◽  
pp. 1467-1475 ◽  
Author(s):  
P. Sikdar ◽  
M. Mazzola ◽  
C. L. Xiao
Keyword(s):  
Control Strategies ◽  
Growing Season ◽  
Apple Fruit ◽  
Fruit Rot ◽  
Effective Control ◽  
Micro Cracks ◽  
Fuji Apple ◽  
Phacidiopycnis Washingtonensis ◽  
Inoculation Time ◽  
Rot Disease

Phacidiopycnis washingtonensis is the cause of speck rot, a recently reported postharvest fruit rot disease of apple. The pathogen is believed to incite infections in the field, and disease symptoms become evident only during storage. To determine the timing of apple fruit infection in relation to development of speck rot in storage, ‘Red Delicious’ and ‘Fuji’ apple fruit were inoculated in the orchard with P. washingtonensis at different times during the growing season, harvested, and monitored for decay development during storage at 0°C. Fruit inoculated in both field and laboratory also were used to identify the infection courts and mode of apple fruit penetration by P. washingtonensis. In all 3 years, stem-end speck rot and calyx-end speck rot developed during cold storage on fruit inoculated during the growing season, regardless of inoculation time; and the incidence of total speck rot in storage increased as the fruit inoculation time approached harvest. On fruit floral parts, the pathogen colonized sepals at higher rates than stamens. Availability of naturally occurring necrotic tissues favored the colonization of the fungus on sepals. Histological studies indicated that infection occurred through micro-cracks on the surfaces of pedicels and sepals of the fruit, and invasion of these tissues was restricted between the cuticle and epidermis. Findings of this study will assist in the development of effective control strategies for speck rot.

Effects of Weed Control and Irrigation on the Growth of Young Pecans

1990 ◽  
Vol 4 (4) ◽  
pp. 892-894 ◽  
Author(s):  
Michael G. Patterson ◽  
Glenn Wehtje ◽  
William D. Goff
Keyword(s):  
Weed Control ◽  
Tree Growth ◽  
Chemical Control ◽  
Growing Season ◽  
Control Effect ◽  
Carya Illinoensis ◽  
Maximum Increase ◽  
Tree Diameter ◽  
The Third ◽  
Selective Chemical

The effect of irrigation and weed control by various mechanical and chemical means was evaluated over a 4-yr period on newly planted pecans [Carya illinoensis(Wang.) K. Koch]. Weed control effect on tree growth became evident in the second growing season, and became more pronounced after the third and fourth season. After the fourth season, the maximum increase in tree diameter (384%) was achieved with comprehensive, herbicide-based weed control. Mowing provided a 224% increase, which was equivalent to the untreated (229%). Disking and selective chemical control of grass weeds resulted in 339 and 292% increase, respectively. Cumulative increase in tree diameter was 316 and 271% with and without irrigation, respectively.

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