Comparison of Stability Statistics as Criteria for Cultivar Development in Peanut1

1989 ◽  
Vol 16 (1) ◽  
pp. 21-25 ◽  
Author(s):  
W. F. Anderson ◽  
R. W. Mozingo ◽  
J. C. Wynne
Keyword(s):  
Breeding Line ◽  
Stability Parameters ◽  
Breeding Lines ◽  
Qualitative Traits ◽  
Stability Variance ◽  
Varying Environments ◽  
Variance Parameters ◽  
Highly Correlated ◽  
Using Data ◽  
The Stability

Abstract Means of yield and qualitative traits are assessed in multi-location tests in the final stages of breeding line evaluation. Due to large environmental variation and genotype x environment interactions, it is often desirable to compare stability of lines over a range of environments. The objective of this study was to use various stability parameters to try and determine the stability of experimental breeding lines. Using data from regional advanced peanut (Arachis hypogaea L.) breeding line yield trials conducted over 3 years and four locations in Virginia and North Carolina, the stability of peanut cultivars and breeding lines was compared. Stability variance was found to be highly correlated (0.91–1.00) with covariate adjusted stability variance. In many instances, the stability-variance parameters produced similar results to pairwise regressions and dissimilarity measures when compared with standard cultivars. However, the distance parameters and regressions provided more precise information on relative responses in varying environments of two advanced breeding lines being considered for release. This allowed for direct comparison to cultivars targetted for replacement. NC 18411 had equal mean yields and qualitative traits but better stability than breeding line NC 18423. Regression analysis indicated that NC 18423 performed best in good environments but worse than most other cultivars in poor environments. Means and stability of value per kilogram and value per hectare were highly correlated with percentage of sound mature kernels and yield (0.92–0.99), respectively. A comparison of means and stability parameters was effective in discerning superiority of peanut breeding lines for potential release and use by growers.

Variation Among Virginia Market-Type Peanut Genotypes in Susceptibility to Tomato Spotted Wilt Virus Vectored by Thrips (Thysanoptera: Thripidae)

2008 ◽  
Vol 35 (2) ◽  
pp. 92-100 ◽  
Author(s):  
S. D. Riniker ◽  
R. L. Brandenburg ◽  
G. G. Kennedy ◽  
T. G. Isleib ◽  
D. L. Jordan
Keyword(s):  
North Carolina ◽  
Tomato Spotted Wilt Virus ◽  
Field Tests ◽  
Breeding Line ◽  
Breeding Lines ◽  
Tomato Spotted Wilt ◽  
Foliar Symptoms ◽  
Arachis Hypogaea L ◽  
Highly Correlated ◽  
Wilt Virus

Abstract Tomato spotted wilt virus (TSWV), a thrips-vectored tospovirus, is an important pathogen of peanut (Arachis hypogaea L.). Development of tolerant cultivars has proven to be one of the most promising methods to manage the disease. Twenty-four genotypes of virginia market-type peanut were monitored in field tests for thrips damage, and TSWV incidence and severity during 2004 and 2005 in North Carolina. The cultivar Gregory had a higher density of adult thrips in foliage than any other genotype, while breeding lines N01057 and N03054E had the lowest density. No significant correlation was detected between thrips density or injury and TSWV incidence. Line N03036EJ had the greatest TSWV incidence, but did not differ from cultivars Gregory or Perry in incidence. Line N00033 had the least TSWV incidence and differed from the cultivars Gregory and Perry. The occurrence of late-season chlorosis or peanut yellowing death (PYD) was highly correlated with TSWV infection (P < 0.0001). Breeding line N02051ol had the greatest incidence of PYD, but did not differ statistically from Gregory or Perry. Lines N03023EF and N01083 had the least PYD incidence. Plants infected with TSWV not expressing foliar symptoms were found in far greater abundance than plants that were infected and symptomatic. Line N03036EJ had the greatest proportion of infected but asymptomatic plants; line N03054E had the least. Susceptible lines are more likely to become infected, rather than just more likely to show spotted wilt symptoms.

scholarly journals Non-parametric stability analyses of protein content in multi-environment trials of wheat (T. aestivum L.)

Genetika ◽  
2015 ◽  
Vol 47 (3) ◽  
pp. 795-810 ◽  
Author(s):  
Yuksel Kaya ◽  
Mehmet Sahin
Keyword(s):  
Standard Deviation ◽  
Protein Content ◽  
Parametric Stability ◽  
Ge Interaction ◽  
Stability Parameters ◽  
Breeding Lines ◽  
Wide Range ◽  
The Stability ◽  
Stability Statistics ◽  
Non Parametric

According to literature, a detailed paper has not been published yet on using non-parametric stability statistics for evaluating genotypic stability in protein content (PC) of wheat. Thus, this study aimed to investigate the stability for PC of wheat using sixteen non-parametric stability measures (YSD-PC standard deviation, RM-Rank mean, RSD-Rank?s standard deviation, RS-Rank Sum stability statistic, PA-Percentage of adaptability, R1 and R2-Range indexes, TOP-Ranking, Si(1), Si(2), Si(3), Si(6), NPi(1), NPi(2) NPi(3)and NPi(4) rank statistics, together with Y-PC mean). The study included 13 wheat genotypes, consisting of 5 registered cultivars and 8 breeding lines, selected from National Wheat Breeding Program of Turkey. The genotypes were grown in ten rain-fed environments, representative of major rain-fed wheat-growing areas of Turkey, during 2011-2013 cropping seasons. The ANOVA showed that the effects due to environments (E), genotypes (G) and GE interaction (GEI) were significant (P < 0.01). Spearman?s rank correlation and principal component analyses (PCA) also revealed that two types of associations were found between the stability parameters: the first type included Si(1), Si(2), Si(3), Si(6), NPi(1), NPi(2) NPi(3), NPi(4), RSD and YSD parameters which were related to static stability, whereas the second type consisted of the Y, RM, TOP, PA, RS, R1 and R2 parameters which are related to dynamic concept of stability. Among the 8 breeding lines, G7 and G8 were the best genotypes in terms of both high PC and stability. In conclusion it could be suggested that dynamic non-parametric stability statistics should be used for selecting genotypes with high PC and stable when tested across a wide range of environments.

scholarly journals Stability of Durum Wheat Genotypes in Some Agronomic Traits Under Bursa Ecological Conditions

2017 ◽  
Vol 5 (11) ◽  
pp. 1394
Author(s):  
Esra Aydoğan Çiftçi ◽  
Pakize Özlem Kurt Polat ◽  
Emre Şenyiğit ◽  
Ramazan Doğan
Keyword(s):  
Stability Analysis ◽  
Regression Coefficient ◽  
Agronomic Traits ◽  
Block Design ◽  
Climatic Conditions ◽  
Stability Parameters ◽  
Environmental Variance ◽  
Breeding Lines ◽  
Randomized Complete Block Design ◽  
The Stability

In the study it is aimed to determine the stabilities of some agronomic traits of 10 different durum wheats over the years in conditions of Bursa. Research was carried out in randomized complete block design with three replications between the years of 2008-2013. Averages of genotypes of agronomic characteristics, Eberhart and Russell’s regression coefficient and deviation from regression, Francis and Kannenberg’s coefficient of variation and environmental variance used as stability parameters. When the results of the study evaluated at the stability analysis, Amb × Çak-30 lines were determined to be stable in most of the agronomic traits. As for grain yield, which is of great importance for the producer, breeding lines of Amb × Çak -26 and Amb × Çak-30 were determined in good harmony at Bursa under different climatic conditions over five years.

scholarly journals An investigation of genotype-environment interaction and stability for pea (Pisum sativum L) seed yield

2000 ◽  
Vol 6 (1) ◽  
Author(s):  
L. Csizmadia ◽  
F. Kormos
Keyword(s):  
Linear Regression ◽  
Pisum Sativum ◽  
Seed Yield ◽  
Regression Technique ◽  
Environment Interaction ◽  
Stability Parameters ◽  
Breeding Lines ◽  
Genotype Environment Interaction ◽  
Pisum Sativum L ◽  
Stability Variance

Eighteen pea breeding lines and three check cultivars were tested in two years with and without irrigation. The linear regression can explain only a small part of GEI so the use of regression technique was not possible for interpreting the data. In this case the ecovalence, stability variance and superiority measure stability parameters cannot describe properly the genotype's response. With the AMMI method it is possible to group properly the genotypes according to their response.

ESTIMATION OF TECHNICAL, SPECIALIZED AND ECONOMIC EFFICIENCY OF CULTIVATED POTATO VARIETIES USING DATA ENVELOPE ANALYSIS METHOD (DEA) IN IRAQ FOR SPRING LUG 2018

2020 ◽  
pp. 119-131
Keyword(s):  
Technical Efficiency ◽  
Economic Efficiency ◽  
Potato Crop ◽  
Economic Status ◽  
Analysis Method ◽  
Envelope Analysis ◽  
Variable Capacity ◽  
Data Envelope Analysis ◽  
Using Data ◽  
The Stability

Research highlights the importance of potato crop, which occupies a prominent food and economic status in food security besides rice, wheat and corn at the local and global level. Despite the expansion of the cultivation of potato crop in Iraq in general and Ameriyah district in particular However, potato productivity remains substandard, this may be due to a lack of knowledge of the most efficient varieties and not to use productive resources at the levels at which technical, specialized and economic efficiency is achieved. Therefore, the aim of the research is to determine the technical, specialized and economic efficiency according to the cultivated seed category. The data envelope analysis (DEA) method was used to estimate technical, specialized and economic efficiency, assuming constant and variable capacity returns. As a result of the study, the Safrana variety achieved the highest average technical efficiency according to the stability of the yield and capacity efficiency in addition to achieving the highest average specialized and economic efficiency, The Lapadia variety achieved the highest average technical efficiency, assuming that capacity returns have changed. Therefore, we recommend the adoption of items that achieve higher efficiency and the need to redistribute the elements of production better and Achieving the optimum levels at which technical, specialized and economic efficiency is achieved and saving what has been wasted.

scholarly journals The Role of Employment Protection during an Exogenous Shock to an Economy

2011 ◽  
Vol 11 (2) ◽  
pp. 1850225 ◽  
Author(s):  
Miki Malul ◽  
Mosi Rosenboim ◽  
Tal Shavit ◽  
Shlomo Yedidia Tarba
Keyword(s):  
Economic Crisis ◽  
Employment Protection ◽  
Exogenous Shock ◽  
Unemployment Rates ◽  
World Crisis ◽  
Automatic Stabilizer ◽  
Medium Level ◽  
Using Data ◽  
The Stability

This paper explores the role of employment protection when powerful external crises reduce demand for products. We first present a theoretical framework that shows that employment protection has a U-shaped effect on abnormal unemployment during a negative exogenous shock to an economy. Using data from the 33 OECD countries, we analyze how the level of employment protection affected the stability of unemployment rates during the recent global economic crisis. The results suggest that countries with an intermediate level of employment protection will have more stable unemployment rates during a world crisis. The policy implication of our paper is that countries should seek a medium level of employment protection that may act as an automatic stabilizer of the economy on the macro level.

Experimentally Determined Stability Parameters of a Subsonic Cascade Oscillating Near Stall

1978 ◽  
Vol 100 (1) ◽  
pp. 111-120 ◽  
Author(s):  
F. O. Carta ◽  
A. O. St. Hilaire
Keyword(s):  
Phase Angle ◽  
Incidence Angle ◽  
Minor Effect ◽  
Significant Finding ◽  
Force Coefficient ◽  
Stability Parameters ◽  
Free System ◽  
Pressure Transducers ◽  
Moment Coefficient ◽  
The Stability

Tests were performed on a linear cascade of airfoils oscillating in pitch about their midchords at frequencies up to 17 cps, at free-stream velocities up to 200 ft/s, and at interblade phase angles of 0 deg and 45 deg, under conditions of high aerodynamic loading. The measured data included unsteady time histories from chordwise pressure transducers and from chordwise hot films. Unsteady normal force coefficient, moment coefficient, and aerodynamic work per cycle of oscillation were obtained from integrals of the pressure data, and indications of the nature and extent of the separation phenomenon were obtained from an analysis of the hot-film response data. The most significant finding of this investigation is that a change in interblade phase angle from 0 deg to 45 deg radically alters the character of the unsteady blade loading (which governs its motion in a free system) from stable to unstable. Furthermore, the stability or instability is governed primarily by the phase angle of the pressure distribution (relative to the blade motion) over the forward 10–15 percent of the blade chord. Reduced frequency and mean incidence angle changes were found to have a relatively minor effect on stability for the range of parameters tested.

Estimation of Construction Waste Generation and Management in Taiwan

2011 ◽  
Vol 243-249 ◽  
pp. 6292-6295 ◽  
Author(s):  
Rong Yau Huang ◽  
Li Hsu Yeh ◽  
Hao Hsien Chen ◽  
Jyh Dong Lin ◽  
Ping Fu Chen ◽  
...  
Keyword(s):  
Decision Tree ◽  
Cross Correlation ◽  
Expert Interviews ◽  
Waste Generation ◽  
Valid Conclusion ◽  
Construction Waste ◽  
Composition Ratio ◽  
The Past ◽  
Highly Correlated ◽  
Using Data

This study examines construction waste generation and management in Taiwan. We verify the factors probable affecting the output of construction wastes by using data for the output of declared construction wastes produced from demolition projects in Taiwan in the last year, expert interviews, and research achievements in the past, and find “ on-site separation” is the factor with effects on the output of construction wastes via cross-correlation by algorithms such as K-Means and Decision Tree C5.0. It can be seen that the output (0.092(t/M3) with on-site separation or 0.329(t/M3) without on-site separation is highly correlated with the composition ratio of construction wastes and referred to as a valid conclusion.

Keeping quality of milk in relation to the copper content and temperature of pasteurization

1986 ◽  
Vol 53 (3) ◽  
pp. 391-406 ◽  
Author(s):  
John E. Ford ◽  
Monika J. A. Schröder ◽  
Michael A. Bland ◽  
Kim S. Blease ◽  
K. John Scott
Keyword(s):  
Heat Treatment ◽  
Raw Milk ◽  
High Heat ◽  
Cu Content ◽  
Storage Losses ◽  
C Storage ◽  
B Complex Vitamins ◽  
Highly Correlated ◽  
Quality Of Milk ◽  
The Stability

SUMMARYFor milk from four herds of cows, maintained under different conditions of feeding and management, the natural Cu content and the stability of the ascorbate were highly correlated. Low Cu levels in milk from cows at pasture at farms A and B during the summer were associated with low storage losses of ascorbate. During this period, the milk of cows at farms C and D (on forage and Cu-supplemented concentrate) was richer in Cu, and losses of ascorbate were high. Heat treatment of the milk stabilized the ascorbate. Thus, in ‘high Cu’ milk (60 µg Cu/l), loss of ascorbate in the raw milk was 58% at 2 d, as against 17% after pasteurization at 72 °C and no loss after treatment at 82 °C. Storage of milk in light caused rapid destruction of ascorbate, equally with 72 and 82 °C heat treatments. The effects were examined of milk pasteurization temperature (72–82 °C) on flavour stability, bacteriological quality and vitamins of the B-complex. Heat treatment at 82 °C increased the susceptibility of vitamin B12 to destruction by light, but otherwise caused no greater losses of B-complex vitamins than did treatment at 72 °C. Taste panel ratings showed an initial preference for milk heated at 72 °C, but on storage of this milk in darkness the flavour score fell progressively and at 5 d it was judged ‘stale’. Treatment at 82 °C gave a faint ‘cooked’ flavour although, unlike that of the 72 °C-treated milk, the flavour remained stable throughout 14-d storage and after d 8 was increasingly preferred. On exposure to light after treatment at 72 °C milks rapidly acquired an unpleasant‘oxidized’ flavour, but after treatment at 82 °C, exposure to light had no such adverse effect on flavour during the early days of storage. Pasteurization at ∼ 80 °C offers a potential for improvement in the oxidative stability of milk and its contribution of vitamin C to the diet.

Updated outcomes for patients with completely resected pulmonary recurrent osteosarcoma: A report from the Children’s Oncology Group.

2021 ◽  
Vol 39 (15_suppl) ◽  
pp. 10023-10023
Author(s):  
Alexander J. Chou ◽  
Mark D. Krailo ◽  
Ruxu Han ◽  
Allen Buxton ◽  
Damon R. Reed ◽  
...  
Keyword(s):  
Disease Control ◽  
Oncology Group ◽  
Specific Patient ◽  
Efficacy Analysis ◽  
Investigational Agent ◽  
Phase 2 Trial ◽  
Select Group ◽  
Using Data ◽  
The Stability ◽  
Histological Confirmation

10023 Background: Amongst patients with recurrent osteosarcoma (OS), those with resectable pulmonary-only relapse appear to have the best outcomes. Prior analysis of patients with completely resected recurrent OS enrolled on a Children’s Oncology Group (COG) Phase 2 trial AOST0221, which studied the efficacy of inhaled GMCSF, showed a 12- month disease control rate (DCR12) of only 20% (95% CI, 10 – 34%). DCR12 based on this analysis was used as the historical benchmark for efficacy analysis in two recently completed trials, AOST1321 (completely resected cohort only) and AOST1421. We analyzed the stability of the DCR12 benchmark using data from these contemporary studies. Methods: Patients were eligible for AOST1321 if they had undergone resection of all sites of recurrent or refractory OS within 30 days of enrollment and for AOST1421 if they had lung only recurrent OS completely resected within 4 weeks of enrollment. AOST1321 evaluated denosumab while AOST1421 evaluated dinutuximab. Patients with refractory disease, extrapulmonary recurrence or without histological confirmation of relapse were excluded from this analysis. DCR12 was defined as having at least stable disease 12 months after the start of protocol therapy. We report the DCR12 observed on AOST1321, AOST1421 and AOST0221. Results: One hundred and twenty-eight evaluable patients with completely resected recurrent OS were enrolled on AOST0221 (N=49), AOST1321 (N=38) and AOST1421 (N=41). One hundred and one patients were included in this analysis (AOST0221: 37, AOST 1321: 25, AOST1421:39). DCR12 was 14 % (95% CI, 5% – 26%) for AOST0221, 24% (95%CI 10-42%) for AOST1321, and 31% (95% CI, 17% - 45%) for AOST1421. Risk for disease progression did not differ across the 3 included studies. DCR12 for all three studies combined was 23% (95% CI, 15% – 31%). Conclusions: Prognosis for recurrent OS remains dismal, even for those with resectable pulmonary-only disease. Although not statistically significant, dinutuximab may have activity in a select group of relapsed OS patients; combination studies using dinutuximab are planned. The previously described benchmark of disease control at 12 months remained relatively consistent in recent studies for those patients who have resectable pulmonary-only relapse. Therefore, DCR12 remains a useful outcome measure in fully resected OS with lung only metastases. Analyses are ongoing to better define the appropriate threshold to define investigational agent activity in this specific patient population.

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