Honeycomb Selection Designs

Fasoulas, A. C.; Fasoula, Vasilia A.

doi:10.1002/9780470650059.ch3

Cited by 130 publications

(213 citation statements)

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“…Among the selected populations there was a trend for MhS and PhS(CC) to produce more DM than PhS. it seems that the mass honeycomb selection (Fasoulas & Fasoula 1995) was efficient for this broad-based population of D. glomerata, which had not previously undergone any further selection procedure. Generally, mass selection is considered a useful tool at the first stages of selection programs for improving biomass production of forage grasses (Sleper 1987).…”

Section: Discussionmentioning

confidence: 92%

“…A broad-based population of D. glomerata was evaluated for DM production during winter, from which 10 superior plants were selected using three different procedures: (a) the 10 best plants using mass honeycomb selection (moving-ring selection) (MhS) (Fasoulas & Fasoula 1995), (b) the 10 best plants using pedigree honeycomb selection (the best two plants from each of the best five families) (PHS), and (c) the 10 best plants by pedigree honeycomb selection using the combined criterion CC = x\\ -CV)/CV that selects jointly for high family mean (x) and reduced family coefficient of variation (CV) (Fasoulas & Fasoula 1995) (PhS(CC)). From each of the best five families on the basis of CC, the two highest yielding plants were finally selected.…”

Section: Methodsmentioning

confidence: 99%

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Defoliation frequency effects on winter forage production and nutritive value of different entries ofDactylis glomerataL.

Abraham

Parissi

Sklavou

et al. 2009

New Zealand Journal of Agricultural Research

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The objective of this study was to evaluate the effect of different defoliation frequencies on winter forage production and nutritive value of improved populations of Dactylis glomerata L. Four entries: (a) base population, (b) selected plants from mass honeycomb selection (MHS), (c) selected plants from pedigree honeycomb selection (PHS), and (d) selected plants from pedigree honeycomb selection using the combined criterion CC = x 2 (1 -CV)/CV (PHS(CC)) were tested under four defoliation frequencies: (1) frequent, (2) moderate, (3) infrequent, and (4) control. Dry matter (DM) production under the frequent and moderate defoliation frequencies was 17% and 7% respectively more than under infrequent defoliation in the first year. However, in the second year, DM production under infrequent defoliation was 41% and 46% higher than under frequent and moderate defoliation, respectively. The DM production of the selected populations (b, c and d) of D. glomerata consistently exceeded that of the base population (a) under various defoliation frequency regimes during winter. Among the selected entries, MHS and PHS(CC) had consistently higher DM production than PHS for the two experimental years. Under increased defoliation frequencies, crude protein content significantly increased and neutral detergent fibre and acid detergent fibre significantly decreased compared with the control defoliation treatment in both years. There were no significant differences (P > 0.05) in nutritive value among the entries. Generally, DM production was more stable under infrequent defoliation, while nutritive value met the demands of small ruminants for maintenance and lactation.

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Section: Discussionmentioning

confidence: 92%

Section: Methodsmentioning

confidence: 99%

Defoliation frequency effects on winter forage production and nutritive value of different entries ofDactylis glomerataL.

Abraham

Parissi

Sklavou

et al. 2009

New Zealand Journal of Agricultural Research

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“…Selection was performed in honeycomb selection designs, which allow the individual plants to express their full genetic potential (Fasoulas & Fasoula, 1995) for five cycles. A total of six high-yielding open-pollinated lines of the 5 th cycle (C4) have been selected on the basis of the two prognostic equations (Fasoula, 2006) with selection intensity near 1%.…”

Section: Plant Materialsmentioning

confidence: 99%

“…Honeycomb breeding and designs, maximize phenotypic expression and differentiation under nil-competition conditions, weakening also soil heterogeneity effects, and thus, resulting in selection of superior individual plants (Fasoulas & Fasoula, 1995;Fasoulas, 1988). This way, plants are enabled to express their full genetic potential for tillering, yielding capacity, robust root systems and full phenotypic expression.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Elite Open-Pollinated Maize Lines in Two Contrasting Environments

Greveniotis¹,

Bouloumpasi²,

Tsakiris³

et al. 2017

JAS

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Selection environment affects plant behavior and response to selection. The objective of the present study was the evaluation of 17 quality and quantity phenotypic characteristics of six open-pollinated maize lines of fifth cycle of selection (C4), which was performed by the implementation of honeycomb breeding, in two contrasting environments (A and B) The soil chemical analysis revealed that the two environments were very diverse (A: SL, pH = 6.25, organic matter: 1.29%, B: SCL, pH = 8, organic matter: 2.4%). Our data suggest that moisture content, seed oil content, ear length, ear diameter, number of grain rows, spindle diameter and seed thickness exhibit inter-location high broad-sense heritability (over 0.9). Heritability estimations were highly depended on the environment, since GEI interaction was high indicating environmental interaction with genotype, especially environment B, which seems to favor heritability. Location affects strongly variation and genotype by environment interaction is significant in many cases. Seed width was the only characteristic to be depended on genetic variability. Descriptive statistics revealed a broad range of mean fluctuations, indicating satisfactory variability in many characteristics to be exploited by breeders. Some characteristics showed low CV (Coefficient of Variation) values (1.6 to 5.3), indicating stability of performance and low environmental effects. Significant correlations between the 17 quantity and quality traits found in our study may be a useful tool for indirect selection of certain characteristics, otherwise difficult to be selected due to non-additive effects. Cluster analysis and PCA showed contrasting results in classification of open-pollinated lines and this was attributed to strong environmental effects that distorted phenotypic expression of the characteristics studied.

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“…Each plot corresponded to a specific plant density and consisted of single-plant hills and included at least 260 of the population and 100 of the control cultivar. Four of the plots were established according to the non-replicated-0 (NR-0) honeycomb design (Fasoulas & Fasoula, 1995), with interplant distances of 1.0, 0.8, 0.6 and 0.4 m. The corresponding densities were 1.15, 1.80, 3.20 and 7.22 . In each plot, plants of the population and the control cultivar were sown at separate rows (e.g., the 1.15 plants m -2 plot consisted of 16 rows involving only the population and of six rows consisting solely of the control cultivar).…”

Section: Introductionmentioning

confidence: 99%

Short communication. Decision on germplasm choice to apply breeding within a local population of common vetch is affected by crowding

Chatzoglou

Tokatlidis

2012

Span. j. agric. res.

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The value of a population as a potential gene pool on which to apply selection may be severely underestimated under competition conditions because of the negative correlation of competitive versus yielding ability. To address this issue, a vetch (Vicia sativa) local population along with a control cultivar was evaluated at densities ranging from 1.15 to 25 plants m -2 . A hyperbolic increasing pattern as density declined was found for both grain and biomass yield. Nevertheless, at the highest density the control cultivar performance exceeded the population, whereas at the lowest density the opposite happened. The results were attributed to the heterogeneity of the population versus the homogeneity of the cultivar combined with the aforementioned negative relationship. It was concluded that severe crowding undervalues the potential of a population because plants representing high yielders cannot exhibit this capacity due to their competitive disadvantage. On the other side, the absence of competition optimizes the yield expression of individual plants. Therefore, absence of competition is recommended as the optimal condition to evaluate populations and make the right decision on the most promising one for breeding.Additional key words: competitive ability; genetic heterogeneity; local population; Vicia sativa; yielding ability. ResumenComunicación corta. La decisión sobre la elección de germoplasma para la mejora de una población local de veza común está afectada por el grado de densidad de siembraEl valor de una población, en el conjunto de sus genes potenciales sobre los que aplicar la selección, podría subestimarse de forma importante en condiciones de competencia, debido a la correlación negativa de la capacidad competitiva frente a la capacidad de producción. Para solucionar este problema, se evaluó una población local de veza (Vicia sativa) junto con un cultivar comercial como control, a densidades que oscilan desde 1,15 hasta 25 plantas m -2 . Se encontró, tanto en producción de grano como de biomasa, un patrón de aumento hiperbólico según iba disminuyendo la densidad. A mayor densidad, el comportamiento del cultivar control fue superior a la población, mientras que a menor densidad ocurrió lo contrario. Los resultados se atribuyeron a la heterogeneidad de la población vs. la homogeneidad del cultivar, combinado con la correlación negativa antes mencionada. Se concluye que las siembras a mayor densidad disminuyen el potencial de una población, porque las plantas muy productivas no llegan a exhibir su capacidad potencial debido a la desventaja competitiva. Por otro lado, la ausencia de competitividad optimiza la expresión de la productividad en plantas individuales. Por tanto, para optimizar la evaluación de las poblaciones para mejora y tomar decisiones correctas, se recomienda la ausencia de competitividad sobre las poblaciones más prometedoras.Palabras clave adicionales: capacidad competitiva; capacidad de producción; heterogeneidad genética; poblaciones locales; Vicia sativa. *Corresponding auth...

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Honeycomb Selection Designs

Cited by 130 publications

References 20 publications

Defoliation frequency effects on winter forage production and nutritive value of different entries ofDactylis glomerataL.

Defoliation frequency effects on winter forage production and nutritive value of different entries ofDactylis glomerataL.

Evaluation of Elite Open-Pollinated Maize Lines in Two Contrasting Environments

Short communication. Decision on germplasm choice to apply breeding within a local population of common vetch is affected by crowding

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