scholarly journals Selection for resistance of soft wheat adaptability to environmental conditions in the south –east of Kazakhstan

2016 ◽  
Vol 1 (46) ◽  
pp. 112-121
Author(s):  
K.K. Shulembaeva ◽  
◽  
Zh.Zh. Chunetova ◽  
S.B. Dauletbaeva ◽  
A.A. Tokubaeva ◽  
...  
Keyword(s):  
Environmental Conditions ◽  
Soft Wheat ◽  
The South ◽  
Selection For

POTATO VARIETIES OF DOMESTIC AND FOREIGN SELECTION FOR IRRIGATED CONDITIONS OF THE SOUTH OF RUSSIA

2021 ◽  
pp. 46-51
Author(s):  
Tamara V. Boeva ◽  
Shamil B. Bajrambekov ◽  
Galina F. Sokolova
Keyword(s):  
The South ◽  
Potato Varieties ◽  
Selection For

The relationship between greasy fleece weight and clean fleece weight in the South Australian Merino

1961 ◽  
Vol 1 (1) ◽  
pp. 34
Author(s):  
GH Ford
Keyword(s):  
Genetic Variability ◽  
Covariance Analysis ◽  
The South ◽  
Weight Relationship ◽  
Different Seasons ◽  
Sire Group ◽  
Selection For ◽  
Fleece Weight ◽  
The Relationship ◽  
Australian Merino

The correlation between clean fleece weight and greasy fleece weight in South Australian strain Merino hoggets of both sexes in three widely different seasons was found to be Rams, 0.841, 0.890, 0.701 and Ewes, 0.846, 0.850 and 0.839. A covariance analysis of clean and greasy fleece weights showed no significant differences between slopes of individual sires, but significant differences between sire group means, indicating genetic variability for these two traits. It is concluded that the correlations are high enough to make selection for clean fleece weight by partial culling on the basis of greasy fleece weight, followed by scouring of midside samples of the fleece from the top sheep for greasy fleece weight, as advocated by Beattie (1956), practicable. The use of the clean fleece weight, greasy fleece weight relationship will rarely be sufficient on its own to formulate a selection plan. The conditions for the use of other aids to estimate clean fleece weight, such as the Neale squeeze machine, are discussed.

scholarly journals Seed productivity and adaptability parameters of the alfalfa samples in the south of the Rostov region

2021 ◽  
pp. 28-33
Author(s):  
S. А. Ignatiev ◽  
А. А. Regidin ◽  
S S. Kravchenko
Keyword(s):  
Environmental Conditions ◽  
Crop Production ◽  
Stress Factors ◽  
Forage Grasses ◽  
The South ◽  
Seed Productivity ◽  
Ecological Adaptability ◽  
Significant Difference ◽  
The Stability ◽  
Adaptability Parameters

The general climate change in the south of Russia makes the development of new varieties of grain crops, including forage grasses, with high resistance and adaptability to climatic stress factors extremely necessary. The breeding process of forage plant adapted to changing environmental conditions is seen as an effective way to allow crop production to cope with unexpected possible climate changes with the least possible losses. The specific reaction of plants to environmental conditions is of particular interest when studying collection plant samples of different gen[1]otypes, as well as when choosing varieties for cultivation in specific conditions. Studying the stability and adaptability of collection samples of forage grasses can also make it possible to use them in different regions. The purpose of the current study was to estimate alfalfa samples by the parameters of ecological adaptability and stability according to the trait ‘seed productivity’. The objects of study were 30 samples of the VIR collection from the USA, Canada, France and Peru. There has been identified a large group of samples with bi < 1. These samples were important as genotypes with a weak responsiveness of seed productivity to worse conditions. They are to be used in hybrids to obtain an initial material that is adaptive according to the trait ‘seed productivity’ in stressful conditions. The smallest bi coefficient was found in the samples ‘K-42694’ (0.20), ‘K-32783’ (0.22) and ‘K-47804’ (0.29). The stability coefficient σd 2 , which reflects the correlation between the growing conditions and seed productivity of the samples through the years of study and was calculated on the basis of the theoretical productivity and the deviation of the theoretical value from the actual one, varied from 0.01 to 74.70. This range of variation indicates that the set of samples contains such samples whose stability of productivity is genetically determined and significantly exceeds the variability of the average productivity of the entire set. Estimation of differences according to stability of seed productivity, in comparison with the standard variety ‘Rostovskaya 90’, revealed a significant difference in this trait in the samples ‘K-43272’, ‘K-50545’, ‘K-50561’.

scholarly journals Budbreak Number in Apple Seedlings as Selection Criterion for Improved Adaptability to Mild Winter Climates

HortScience ◽  
2003 ◽  
Vol 38 (6) ◽  
pp. 1186-1190 ◽  
Author(s):  
Iwan F. Labuschagné ◽  
J.H. Louw ◽  
Karin Schmidt ◽  
Annalene Sadie
Keyword(s):  
Environmental Conditions ◽  
Selection Criterion ◽  
Shoot Length ◽  
Natural Conditions ◽  
Mild Winter ◽  
Winter Conditions ◽  
Important Symptom ◽  
Selection For ◽  
Prolonged Dormancy

Absence or long delay of budbreak, also known as prolonged dormancy, is the most important symptom during incomplete dormancy. Budbreak number was evaluated to quantify seedling response to chilling and selection on excised and intact 1-year-old apple (Malus ×domestica Borkh.) seedlings under controlled and natural environmental conditions. Indices based on: 1) the number and distribution of budbreak (prolonged dormancy grade = PDG); 2) the number of buds breaking, including shoot length with increased budbreak as part of the calculation (prolonged dormancy index = PDI); and 3) budbreak number per 100-cm shoot (NB) were tested in association with budbreak time (TB). The indices expressed the effects of cold treatments that induce earlier and higher numbers of budbreak. PDI and NB, but not PDG, identified families with increased budbreak. Seedlings with high PDG and NB were also associated with families in which high chill requiring parents were used, indicating that TB as pre-selection criterion may fail to identify seedlings with increased budbreak. Response to pre-selection for increased budbreak using PDG could be verified with the PDS and NB indices in seedlings and seedling clones. The NB of intact 1-year-old shoots under natural conditions is recommended as a pre-selection criterion against prolonged dormancy in suboptimal winter conditions.

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