Hill plots for yield evaluation in a doubled haploid recurrent selection program in barley (Hordeum vulgare L.)

1996 ◽  
Vol 76 (4) ◽  
pp. 757-761 ◽  
Author(s):  
D. E. Falk ◽  
E. Reinbergs ◽  
B. S. Chhina ◽  
D. E. Mather
Keyword(s):  
Powdery Mildew ◽  
Grain Yield ◽  
Doubled Haploid ◽  
Recurrent Selection ◽  
Agronomic Traits ◽  
Hordeum Vulgare L ◽  
Selection Program ◽  
Hill Plot ◽  
Plot Yield ◽  
Hill Plots

Seven selected doubled haploid lines, from each of three cycles (C0, C1, C2) of a diallel recurrent selection program, the seven original parents and two check cultivars were evaluated in replicated hill and row plots at two locations in Ontario in 1988 and 1989. Comparison of hill and row plots using means ranges, coefficient of variation, repeatability and correlations among traits indicated that grain yield, days to heading plant height and powdery mildew resistance could be evaluated with similar accuracy and precision using either of the methods. Regression of row plot yield on hill plot yield was positive and highly significant showing a strong relationship between the two plot types for grain yield. Selection efficiency in hill plots was high for all the traits. The percentage of lines with similar performance for yield in both the plot types was high. The hill plot method appears to be a useful technique for evaluating homozygous lines for yield and other agronomic traits in a doubled haploid recurrent selection program in six-row barley. Key words:Hordeum vulgare L., barley, breeding methods, yield, powdery mildew, doubled haploid, recurrent selection

COMPARISON OF HILL AND ROW PLOTS FOR AGRONOMIC AND QUALITY TRAITS IN SPRING MALTING BARLEY (Hordeum vulgare L.)

1990 ◽  
Vol 70 (1) ◽  
pp. 61-69 ◽  
Author(s):  
S. TRAGOONRUNG ◽  
P. M. HAYES ◽  
B. L. JONES
Keyword(s):  
Hordeum Vulgare ◽  
Recurrent Selection ◽  
Agronomic Traits ◽  
Malting Quality ◽  
Quality Traits ◽  
Malting Barley ◽  
Seeding Rate ◽  
Hordeum Vulgare L ◽  
Hill Plot ◽  
Hill Plots

Provided they reliably predict row plot performance, hill plots should be useful for doubled haploid recurrent selection in malting barley (Hordeum vulgare L.). The primary objective of this research was to compare hill and row plot expression of agronomic and malting quality traits in an array of elite spring habit barley germplasm grown under irrigated conditions. A supporting objective was to identify an appropriate seeding rate for hill plot evaluation. Eight-replicate hill plots at four seeding rates (10, 20, 30, and 40 seeds per hill) were compared with adjacent four-replicate row plots in each of three environments. Genotype and genotype × environment interactions were significant for most agronomic traits in both plot types. Significant, linear genotype responses to hill plot seeding rates were observed for most agronomic traits. Seeding rate had no consistent effect on the expression of malting quality. The percentage of lines in common in the two plot types at 25 and 50% selection intensities was the most useful comparison statistic and indicated hill plot selection should be effective for most agronomic and malting quality traits. Although yield heritability estimates were consistently high in both hill and row plots, there was little relationship between trait expression in the two plot types. Differential tillering in response to hill plot competition is likely responsible. A seeding rate of 10 seeds per hill should be appropriate in preliminary screening for traits amenable to hill plot selection in irrigated spring habit malting barley.Key words: Hordeum vulgare L., malting quality, breeding methods, barley

The predictive value of parental, F1 and early generation hill-plot testing for yield among rapidly advanced hexaploid triticales

1994 ◽  
Vol 45 (1) ◽  
pp. 51 ◽  
Author(s):  
RM Trethowan ◽  
NL Darvey
Keyword(s):  
Grain Yield ◽  
Harvest Index ◽  
Dry Matter ◽  
Yield Potential ◽  
Hill Plot ◽  
Plot Yield ◽  
Backcross Populations ◽  
Large Plot ◽  
Rapid Generation ◽  
Hill Plots

Rapid generation turnover techniques were used to identify parental, single cross or backcross populations with yield potential in triticale. Both complete (complete rye genome) and substituted (2D/2R substitution) triticale karyotypes were crossed. Temperature and light controlled greenhouses, immature seed germination, embryo culture and off season nurseries were used to advance three generations in 11 months. Due to seed limitations in the early generations, hill-plots were used to measure total dry matter, grain yield and harvest index. Mid-parent, F2 and F3 hill-plot yield was equivalent to or better than dry matter and harvest index for the prediction of F4 hill-plot yield. Both hill-plot yield (r = 0.54) and dry matter (r = 0-51) were significantly correlated (P < 0.01) with large plot grain yield at the same site in the same year. The best predictors of F4 hill-plot yield were mid-parent, F2 and F3 mean hill-plot yield with phenotypic correlations of 0- 26� 0.17, 0.3510 -03 and 0.44� 0.06 respectively. The F1 (r = -0.02�0.12) provided no association with F4 hill-plot yield, reflecting the high average heterosis for yield (22%) observed in this material. Mid-parent, F2, F3 and F4 dry matter and yield means were significantly lower in inter-karyotypic crosses than intra-karyotypic crosses; however, the relationship between generations appeared to be independent of karyotype. A response to visual selection of individual spikes from hill-plots was obtained at two sites for dry matter and grain yield.

scholarly journals Selección para calidad fisiológica de la semilla y rendimiento en líneas S2 derivadas de cuatro poblaciones tropicales de maíz (Zea mays L.)

2016 ◽  
Vol 7 (1) ◽  
pp. 58
Author(s):  
Enrique Navarro ◽  
Cristina Vega ◽  
Fernando Narváez ◽  
Hugo Córdova
Keyword(s):  
Genetic Variability ◽  
Grain Yield ◽  
Recurrent Selection ◽  
Zea Mays L ◽  
Agronomic Traits ◽  
Reciprocal Recurrent Selection ◽  
Laboratory Conditions ◽  
Flower Plant ◽  
Ear Height ◽  
Field And Laboratory Conditions

This study was carried out in 1993 to evaluate S2 lines from four maize tropical populations improved by reciprocal recurrent selection. These lines were evaluated under field and laboratory conditions, the latter one to determine physiology quality. The main goal was to measure genetic variability within and among populations for traits such as grain yield, vigor and germination and to select the best lines under field and laboratory conditions. The combined analysis of variance showed great genetic variability among the S2 lines within and among populations for grain yield, days to flower, plant and ear height, among others. The maximum genetic variability was observed on the lines from population 43 and pool 23 for most of the traits, although the latter showed a greater genetic variability for grain yield. Besides, it is important to mention that the above populations included the best genotypes for grain yield, germination and vigor. Taking into account the above mentionel agronomic traits, fifteen lines were selected; 2 belong to population 43* pool 20, 2 from pool 19* pool 23, 8 from population 43, and 3 from pool 23. These results confirm the genetic superiority of the lines from populations 43 and pool 23, so that these populations should be recommended for future genetic improvement by reciprocal recurrent procedures.

Comparison of F2 and F∞ diallel analyses in barley

Genome ◽  
1988 ◽  
Vol 30 (6) ◽  
pp. 865-869 ◽  
Author(s):  
T. M. Choo ◽  
E. Reinbergs ◽  
P. Y. Jui
Keyword(s):  
Hordeum Vulgare ◽  
Grain Yield ◽  
Plant Height ◽  
Variance Components ◽  
Genetic Variance ◽  
Additive Genetic Variance ◽  
Heading Date ◽  
Diallel Analysis ◽  
Hordeum Vulgare L ◽  
Hill Plots

A study was conducted in barley (Hordeum vulgare L.) to compare the relative magnitudes of heterosis to additive × additive epistasis and to compare F2 and F∞, diallel analyses. Both F2 and F∞, progenies were derived from 7 × 7 diallel crosses. Progenies and their parents were evaluated for grain yield, heading date, plant height, and the number of spikes per hill in hill plots with five replications at Elora (Ontario) in 1978. Results suggested that additive × additive epistasis were present for these traits and its magnitude was similar to that of heterosis estimated in F2. Both F2 and F∞ analyses detected the presence of epistasis. Both analyses provided similar estimates of the additive genetic variance for heading date and the number of spikes per hill, but the F2 analysis provided higher estimates than the F∞ analysis for grain yield and plant height. The estimate for grain yield and plant height obtained from the F2 analysis could be biased upward because of the invalid assumption of no epistasis. Estimates of other genetic variance components from the F2 analysis could be biased also. The F∞ diallel analysis not only provided estimates of additive × additive genetic variance for the four traits, it also allowed detection of nonindependent gene distribution in the parents for three of the four traits. Therefore, the limitations of the F2 diallel analysis in the presence of epistasis were apparent in the study. The F2 diallel analysis, however, could be used to detect dominance and maternal effects and thus to complement the F∞ diallel analysisKey words: barley, Hordeum vulgare, diallels, haploids, epistasis, heterosis.

Recurrent selection in doubled-haploid populations of barley (Hordeurn vulgare L.)

1985 ◽  
Vol 27 (2) ◽  
pp. 172-177 ◽  
Author(s):  
J. D. Patel ◽  
E. Reinbergs ◽  
S. O. Fejer
Keyword(s):  
Doubled Haploid ◽  
Recurrent Selection ◽  
Doubled Haploids ◽  
Additive Genetic Variance ◽  
Response To Selection ◽  
Hordeum Vulgare L ◽  
Doubled Haploid Lines ◽  
Days To Heading ◽  
High Selection ◽  
Dh Lines

Cycle zero (C0) of recurrent selection in barley (Hordeum vulgare L.) was initiated by diallel mating of seven highly selected parents. A total of 398 doubled-haploid (C0DH) lines were derived from 21 crosses and were evaluated along with their parents in C0 experiment. Seven doubled-haploid lines (DH) were selected from the cycle zero (C0) experiment and intercrossed to form cycle 1 (C1). From the 21 crosses of the diallel, 260 doubled-haploid lines (C1DH) were derived and were evaluated along with the C0 and C1 parents. The frequency distribution of the standardized means of the DH lines from C0 and C1 indicated a slight response to selection for seed yield. Genetic analysis of the C1DH population showed high additive genetic variance for yield per hill, plant height, and yield per spike, and a high proportion of additive × additive epistasis for spikes per hill, days to heading, and 100-seed weight. Seven doubled-haploid lines were selected from different high-yielding crosses represented by C1DH lines. High selection pressure was applied for yield per hill, yield per spike, and spikes per hill. Further response to selection is expected in later cycles. The seven selected doubled-haploid lines will be used as the parents of the next recurrent selection cycle.Key words: recurrent selection, doubled haploids, additive, epistasis, heritability, Hordeum.

scholarly journals Detection of drought tolerance-related QTL in the Plainsman V./Cappelle Desprez doubled haploid wheat population

2021 ◽  
Author(s):  
É. Nagy ◽  
Á. Szabó-Hevér ◽  
S. Lehoczki-Krsjak ◽  
C. Lantos ◽  
E. Kiss ◽  
...  
Keyword(s):  
Drought Tolerance ◽  
Grain Yield ◽  
Doubled Haploid ◽  
Agronomic Traits ◽  
Abiotic Factors ◽  
Phenotypic Variance ◽  
Thousand Grain Weight ◽  
Dh Population ◽  
Wheat Population ◽  
Irrigation Levels

AbstractDrought stress is one of the major abiotic factors that significantly reduces wheat grain yield. Improving drought tolerance is a challenge that plant breeders are facing nowadays. In this study, our goal was to identify quantitative trait loci (QTL) in the Plainsman V./Cappelle Desprez doubled haploid (DH) population under drought induced as decreased irrigation (ds) and well-watered (ww) conditions in glasshouse. In total, 54 QTL were detected across the three years in two water regimes linked to 10 drought tolerance-related agronomic traits. Out of the detected QTL regions several have been previously reported. The QTL on chromosome 1A (wPt-744613-wPt-8016) related to thousand grain weight was detected in both ds and ww conditions, explaining the 12.7–17.4% of the phenotypic variance. QTL for grain yield was detected on chromosomes 1A, and 6B in the ds treatment. Numerous QTL was identified under both irrigation levels.

Linearity of offspring–parent regression in barley

Genome ◽  
1989 ◽  
Vol 32 (4) ◽  
pp. 719-723
Author(s):  
T. M. Choo
Keyword(s):  
Regression Analysis ◽  
Hordeum Vulgare ◽  
Linear Regression ◽  
Maternal Effects ◽  
Doubled Haploid ◽  
Heading Date ◽  
Mean Square ◽  
Quadratic Regression ◽  
Hordeum Vulgare L ◽  
Hill Plots

A study was conducted to test the linearity of offspring–parent regression in barley. Forty-two F2 familes and 398 F∞ (i.e., doubled haploid) lines were derived from 7 × 7 diallel crosses. The F2 families, F∞ lines, and their parents were evaluated in hill plots with five replications. Three types of regression analysis (F2 family on midparent, F∞ family on midparent, and F∞ line on midparent) were carried out for grain yield, heading date, plant height, and number of spikes per hill. The linear regression mean square was significant in most cases, but the quadratic regression mean square was not significant in all cases. These results suggest that the true regression of offspring on midparent is linear, although dominance, additive × additive epistasis, and maternal effects were detected for the four traits of the same materials in previous studies.Key words: barley, Hordeum vulgare L., curvilinearity, regression, heritability.

SOME OBSERVATIONS ON POLYEMBRYONY IN CROSSES BETWEEN TWINNING AND NONTWINNING LINES OF FLAX

1986 ◽  
Vol 66 (4) ◽  
pp. 819-824 ◽  
Author(s):  
G. G. ROWLAND ◽  
L. A. WEERASENA
Keyword(s):  
Key Words ◽  
Doubled Haploid ◽  
Linum Usitatissimum ◽  
Recurrent Selection ◽  
Female Parent ◽  
Selection Program ◽  
Doubled Haploid Lines ◽  
Linum Usitatissimum L ◽  
Significant Difference ◽  
Twinning Frequency

A recurrent selection program was initiated using the polyembryony character found in flax (Linum usitatissimum L.) to produce haploids that could then be used to create doubled haploid lines. Observations from this programme show that using the haploid member of a twin seedling as the female parent in crosses to the diploid male is not as efficient as using its diploid twin as the female parent. Previous work has suggested that in lines carrying the polyembryony character, bolls containing fewer than 10 seeds, which is the maximum number in flax, were more likely to contain a seed that would give rise to a twin seedling. In this study twin seedlings were obtained from seed of bolls containing from 1 to 10 seeds, and bolls with 10 seeds were often as good a source of twin seedlings as those with nine seeds or fewer. There was no significant difference in the twinning frequency of F2 seed of crosses between twinning and nontwinning lines (range 0.8–1.9%) but these same crosses were significantly different in twinning frequency in doubled haploid lines (range 1.1–7.9%). The twinning frequency of individual doubled haploid lines within crosses varied from 0.4 to 20.3%.Key words: Flax, haploid breeding, polyembryony, Linum usitatissimum

scholarly journals Grain-yield stability among tropical maize hybrids derived from doubled-haploid inbred lines under random drought stress and optimum moisture conditions

2018 ◽  
Vol 69 (7) ◽  
pp. 691 ◽  
Author(s):  
Julius Pyton Sserumaga ◽  
Yoseph Beyene ◽  
Kiru Pillay ◽  
Alois Kullaya ◽  
Sylvester O. Oikeh ◽  
...  
Keyword(s):  
Drought Stress ◽  
Grain Yield ◽  
Doubled Haploid ◽  
Agronomic Traits ◽  
Doubled Haploids ◽  
Inbred Lines ◽  
High Yield ◽  
Ge Interaction ◽  
Maize Production ◽  
Drought Conditions

Drought is a devastating environmental stress in agriculture and hence a common target of plant breeding. A review of breeding progress on drought tolerance shows that, to a certain extent, selection for high yield in stress-free conditions indirectly improves yield in water-limiting conditions. The objectives of this study were to (i) assess the genotype × environment (GE) interaction for grain yield (GY) and other agronomic traits for maize (Zea mays L.) across East African agro-ecologies; and (ii) evaluate agronomic performance and stability in Uganda and Tanzania under optimum and random drought conditions. Data were recorded for major agronomic traits. Genotype main effect plus GE (GGE) biplot analysis was used to assess the stability of varieties within various environments and across environments. Combined analysis of variance across optimum moisture and random drought environments indicated that locations, mean-squares for genotypes and GE were significant for most measured traits. The best hybrids, CKDHH1097 and CKDHH1090, gave GY advantages of 23% and 43%, respectively, over the commercial hybrid varieties under both optimum-moisture and random-drought conditions. Across environments, genotypic variance was less than the GE variance for GY. The hybrids derived from doubled-haploid inbred lines produced higher GY and possessed acceptable agronomic traits compared with the commercial hybrids. Hybrid CKDHH1098 ranked second-best under optimum-moisture and drought-stress environments and was the most stable with broad adaptation to both environments. Use of the best doubled-haploids lines in testcross hybrids make-up, well targeted to the production environments, could boost maize production among farmers in East Africa.

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