AN ANALYSIS OF THE RESPONSE OF NINE POTATO GENOTYPES TO FIVE PRAIRIE ENVIRONMENTS

1988 ◽  
Vol 68 (4) ◽  
pp. 1219-1228 ◽  
Author(s):  
D. R. LYNCH ◽  
G. C. KOZUB
Keyword(s):  
Principal Component Analysis ◽  
Specific Gravity ◽  
Current System ◽  
Principal Component ◽  
Component Analysis ◽  
Russet Burbank ◽  
Environment Interaction ◽  
Yield Traits ◽  
Marketable Yield ◽  
Vine Maturity

A study of the response of the tuber and vine traits of nine genotypes (A68710–5, Acadia Russet, F74123, Min9632, Neb71.72, Norchip, Norland, Russet Burbank, and W848) to five Prairie environments (Brooks and Edmonton, Alberta; Carman and Morden, Manitoba; Outlook, Saskatchewan) over a 3-yr period was undertaken to rationalize: (1) the location of Prairie trial sites and (2) the current system of early generation selection at an irrigated site for cultivar development for both dryland and irrigated areas in the Prairie provinces. Location × genotype interactions were significant for marketable yield traits, (P < 0.01), marketable tuber number (P < 0.01), average tuber weight (P < 0.05) and vine maturity (P < 0.05). The cause of these interactions was studied by joint regression, cluster, and principal component analysis. As expected, dryland and irrigated locations were grouped together. For marketable yield, both cluster and principal component analysis indicated that Neb71.72 and Russet Burbank formed one group and the remaining seven genotypes another. For the other tuber and vine traits, the regression approach and cluster analysis were less useful. Broad-sense heritabilities were low for yield traits and high for vine maturity, specific gravity, and chip fry color. Although the number of genotypes in the study was small, the data suggest that a moderate selection pressure for yield, with more severe selection for vine maturity, specific gravity, and chip score under irrigated conditions, should not eliminate clones adapted to the dryland areas of the Prairies. The results of this study also indicate that the two Manitoba sites as well as the two irrigated sites provide essentially the same information.Key words: Genotype-environment interaction, yield traits, quality traits

scholarly journals Principal component analysis for seed yield traits in roselle (Hibiscus sabdariffa L.)

2017 ◽  
Vol 8 (1) ◽  
pp. 46
Author(s):  
N. Hari Satyanarayana ◽  
S. Mukherjee ◽  
V. Visalakshmi ◽  
Bhanu priya ◽  
K.K. Sarkar
Keyword(s):  
Principal Component Analysis ◽  
Seed Yield ◽  
Principal Component ◽  
Component Analysis ◽  
Yield Traits ◽  
Hibiscus Sabdariffa

scholarly journals Use of Principal Component Analysis to Combine Genetic Merit for Heat Stress and for Fat and Protein Yield in Spanish Autochthonous Dairy Goat Breeds

Animals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 736
Author(s):  
Alberto Menéndez-Buxadera ◽  
Eva Muñoz-Mejías ◽  
Manuel Sánchez ◽  
Juan Manuel Serradilla ◽  
Antonio Molina
Keyword(s):  
Principal Component Analysis ◽  
Heat Stress ◽  
Genetic Variability ◽  
Negative Impact ◽  
Genetic Correlations ◽  
Principal Component ◽  
Component Analysis ◽  
Dairy Goat ◽  
Environment Interaction ◽  
Dairy Goats

We studied the effect of the Temperature Humidity Index (THI) (i.e., the average of temperature and relative humidity registered at meteorological stations) closest to the farms taken during the test day (TD), for total daily protein and fat yields (fpy) of the three main Spanish dairy goats. The data were from Florida (11,244 animals and 126,825 TD), Malagueña (12,215 animals and 141,856 TD) and Murciano Granadina (5162 animals and 62,834 TD) breeding programs and were studied by different linear models to estimate the nature of the fpy response throughout the THI and the weeks of lactation (Days in Milk, DIM) trajectories. The results showed an antagonism between THI and DIM, with a marked depression in the fpy level in animals kept in the hot zone of the THI values (THI > 25) compared with those in the cold zone (THI ≤ 16), with a negative impact equivalent to production of 13 to 30 days. We used a Reaction Norm model (RN), including THI and DIM as fixed covariates and a Test Day Model (TDM), to estimate the genetic (co)variance components. The heritability and genetic correlations estimated with RN and TDM showed a decreased pattern along the scale of THI and DIM, with slight differences between breeds, meaning that there was significant genetic variability in the animal’s ability to react to different levels of THI, which is not constant throughout the DIM, showing the existence of genotype-environment interaction. The breeding values (BV) of all animals for each level of THI and DIM were subject to a principal component analysis, and the results showed that 89 to 98% of the variance between the BV was explained by the two first eigenvalues. The standardized BV were weighted with the corresponding eigenvector coefficients to construct an index that showed, in a single indicator, the most complete expression of the existing genetic variability in the animals’ ability to produce fpy along the trajectories of THI and DIM. This new option will make it easier to select animals which are more productive, and with better adaptability to heat stress, as well as enabling us to exploit genetic variations in the form of the response to heat stress to be adapted to different production systems.

A German version of the Intermittent Claudication Questionnaire (ICQ): cultural adaptation and validation

VASA ◽  
2012 ◽  
Vol 41 (5) ◽  
pp. 333-342 ◽  
Author(s):  
Kirchberger ◽  
Finger ◽  
Müller-Bühl
Keyword(s):  
Principal Component Analysis ◽  
Intermittent Claudication ◽  
Completion Time ◽  
Short Form ◽  
Principal Component ◽  
Component Analysis ◽  
German Version ◽  
Average Completion Time ◽  
Sf 36 ◽  
Related Quality

Background: The Intermittent Claudication Questionnaire (ICQ) is a short questionnaire for the assessment of health-related quality of life (HRQOL) in patients with intermittent claudication (IC). The objective of this study was to translate the ICQ into German and to investigate the psychometric properties of the German ICQ version in patients with IC. Patients and methods: The original English version was translated using a forward-backward method. The resulting German version was reviewed by the author of the original version and an experienced clinician. Finally, it was tested for clarity with 5 German patients with IC. A sample of 81 patients were administered the German ICQ. The sample consisted of 58.0 % male patients with a median age of 71 years and a median IC duration of 36 months. Test of feasibility included completeness of questionnaires, completion time, and ratings of clarity, length and relevance. Reliability was assessed through a retest in 13 patients at 14 days, and analysis of Cronbach’s alpha for internal consistency. Construct validity was investigated using principal component analysis. Concurrent validity was assessed by correlating the ICQ scores with the Short Form 36 Health Survey (SF-36) as well as clinical measures. Results: The ICQ was completely filled in by 73 subjects (90.1 %) with an average completion time of 6.3 minutes. Cronbach’s alpha coefficient reached 0.75. Intra-class correlation for test-retest reliability was r = 0.88. Principal component analysis resulted in a 3 factor solution. The first factor explained 51.5 of the total variation and all items had loadings of at least 0.65 on it. The ICQ was significantly associated with the SF-36 and treadmill-walking distances whereas no association was found for resting ABPI. Conclusions: The German version of the ICQ demonstrated good feasibility, satisfactory reliability and good validity. Responsiveness should be investigated in further validation studies.

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