Path analysis and expected response in indirect selection for grain yield in soybean

Several studies have searched for higher efficiency on plant selection in generations bearing high frequency of heterozygotes. This work aims to compare the response of direct selection for grain yield, indirect selection through average grain weight and combined selection for higher yield potential and average grain weight of oat plants (Avena sativa L.), using the honeycomb breeding method. These strategies were applied in the growing seasons of 2001 and 2002 in F3 and F4 populations, respectively, in the crosses UPF 18 CTC 5, OR 2 <FONT FACE=Symbol>´</FONT> UPF 7 and OR 2 <FONT FACE=Symbol>´</FONT> UPF 18. The ten best genetic combinations obtained for each cross and selection strategy were evaluated in greenhouse yield trials. Selection of plants with higher yield and average grain weight might be performed on early generations with high levels of heterozygosis. The direct selection for grain yield and indirect selection for average grain weight enabled to increase the average of characters under selection. However, genotypes obtained through direct selection presented lower average grain weight and those obtained through the indirect selection presented lower yield potential. Selection strategies must be run simultaneously to combine in only one genotype high yield potential and large grain weight, enabling maximum genetic gain for both characters.

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Correlations and path analysis of morphological and yield traits of cactus pear accessions

Cropp Breeding and Applied Biotechnology ◽

10.1590/s1984-70332013000300009 ◽

2013 ◽

Vol 13 (3) ◽

pp. 203-207 ◽

Cited By ~ 9

Author(s):

Diogo Gonçalves Neder ◽

Fabiane Rabelo da Costa ◽

Ricardo Loiola Edvan ◽

Lenildo Teixeira Souto Filho

Keyword(s):

Path Analysis ◽

Dry Matter ◽

Selection Process ◽

Morphological Characteristics ◽

Indirect Selection ◽

Strongly Correlated ◽

Fresh Matter ◽

Cactus Pear ◽

Green Matter ◽

Selection For

The objectives of this study were to evaluate the relationships between morphological characteristics and fresh matter yield of cactus pear and identify their direct and indirect effects. Nineteen accessions were evaluated for the following traits: number (NCl), thickness (ThCl), length (LCl) and width (WCl) of cladodes, plant height (PH) and plant width (PW), and green matter yield (GMY), dry matter yield (DMY) and dry matter percentage (DM). The correlations were estimated, and path analysis was performed by the method proposed by Wright. GMY was strongly correlated with DMY, allowing indirect selection for this trait. NCl and ThCl had a direct effect on GMY and can be used for indirect selection or as secondary traits in the selection process. Given the lack of significant correlations between MS and DMY, it is possible to select a palm variety with high DMY and DM.

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Correlations and path analysis for yield components in irrigated rice

Comunicata Scientiae ◽

10.14295/cs.v9i2.2017 ◽

2018 ◽

Vol 9 (2) ◽

pp. 154-161

Author(s):

Eduardo Anibele Streck ◽

Gabriel Almeida Aguiar ◽

Paulo Henrique Karling Facchinello ◽

Lais Perin ◽

Tuise Kuhn Krüger ◽

...

Keyword(s):

Grain Yield ◽

Path Analysis ◽

Phenotypic Correlation ◽

Panicle Length ◽

Agronomic Characters ◽

Complex Character ◽

Irrigated Rice ◽

Selection For ◽

Main Components ◽

Selection Of

Grain yield of irrigated rice is a complex character resulting from the expression and association of different components, which should be considered by the breeder for an efficient process of selection of new genotypes. In this sense, the objective is to highlight the phenotypic correlations and the direct and indirect associations of the main components related to crop yield via path analysis. The experiment was carried out in an experimental field of the Lowlands Station of Embrapa Clima Temperado using six genotypes of irrigated rice: the cultivars BRS Pampa, BRS IRGA 409, BRS 7 ‘Taim’, BRS Sinuelo CL, BRS Pampeira and AB 10101 CL. The agronomic characters evaluated were grain yield, days to flowering, panicle length, panicle mass, number of fertile spikelets, number of sterile spikelets, number of tillers per plant, number of panicles per square meter, and mass of one thousand grains. The number of fertile spikelets, number of panicles per square meter, panicle mass and mass of one thousand grains influenced grain yield, both through phenotypic correlation and direct effects. In addition, there was a high direct linear tendency of these variables towards yield. Panicle length and number of sterile spikelets showed a potential of use in the indirect selection for grain yield.

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Mineral accumulation, carbon isotope discrimination and indirect selection for grain yield in two-rowed barley grown under semiarid conditions

European Journal of Agronomy ◽

10.1016/s1161-0301(98)00032-x ◽

1998 ◽

Vol 9 (2-3) ◽

pp. 147-155 ◽

Cited By ~ 43

Author(s):

J. Voltas ◽

I. Romagosa ◽

P. Muñoz ◽

J.L. Araus

Keyword(s):

Grain Yield ◽

Carbon Isotope ◽

Carbon Isotope Discrimination ◽

Indirect Selection ◽

Isotope Discrimination ◽

Selection For ◽

Mineral Accumulation ◽

Semiarid Conditions

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Wheat Breeding Nurseries, Target Environments, and Indirect Selection for Grain Yield

Crop Science ◽

10.2135/cropsci1997.0011183x003700040024x ◽

1997 ◽

Vol 37 (4) ◽

pp. 1168-1176 ◽

Cited By ~ 87

Author(s):

M. Cooper ◽

R. E. Stucker ◽

I. H. DeLacy ◽

B. D. Harch

Keyword(s):

Grain Yield ◽

Indirect Selection ◽

Wheat Breeding ◽

Selection For

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Correlations and path analysis in agronomic traits of soybeans under defoliation

Bioscience Journal ◽

10.14393/bj-v36n5a2020-48220 ◽

2020 ◽

Vol 36 (5) ◽

Author(s):

Alan Mario Zuffo ◽

Francisco de Alcântara Neto ◽

Tiago Zoz ◽

Rafael Felippe Ratke ◽

Jorge González Aguilera ◽

...

Keyword(s):

Grain Yield ◽

Plant Height ◽

Agronomic Traits ◽

Block Design ◽

Indirect Selection ◽

Additional Treatment ◽

Leaf Damage ◽

Thousand Grain Weight ◽

Randomized Block Design ◽

Selection For

Stress events or leaf damage can alter the redistribution of photoassimilates and modify the morphological traits directly related to grain yield. This study aimed to evaluate the influence of agronomic traits on grain yield in soybean crop in function of leaf defoliation. The experiment consisted of a randomized block design with three replications, arranged in a 6 x 3 + 1 factorial scheme. The factors were composed by six reprodutive stages (R1, R2, R3, R4, R5, and R6) and three defoliation levels (33%, 66%, and 99%), and one additional treatment without defoliation (control). The following traits were evaluated: plant height, number of pods per plant, number of grains per pod, thousand grain weight, and grain yield. The magnitudes of the correlations between the same traits showed high oscillation according to the defoliation level. Results revealed the potential for the indirect selection for grain yield by the traits plant height and number of grains per pods under 0% of defoliation and by the trait number of pods per plant under 33% of defoliation.

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Direct and Indirect Selection for Grain Yield in Bread Wheat (Triticum aesitivum L.)

Journal of Plant Production ◽

10.21608/jpp.2020.87102 ◽

2020 ◽

Vol 11 (3) ◽

pp. 241-249

Author(s):

Hassan Fouad ◽

M. El-Ashmoony ◽

A. El-Karamity ◽

M. Sarhan

Keyword(s):

Grain Yield ◽

Bread Wheat ◽

Indirect Selection ◽

Selection For

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Heritability, correlated response, and indirect selection involving spectral reflectance indices and grain yield in wheat

Australian Journal of Agricultural Research ◽

10.1071/ar06270 ◽

2007 ◽

Vol 58 (5) ◽

pp. 432 ◽

Cited By ~ 15

Author(s):

M. A. Babar ◽

M. van Ginkel ◽

M. P. Reynolds ◽

B. Prasad ◽

A. R. Klatt

Keyword(s):

Grain Yield ◽

Spectral Reflectance ◽

Genetic Correlations ◽

Grain Filling ◽

Indirect Selection ◽

The Other ◽

Correlated Response ◽

Response To Selection ◽

Selection For ◽

Reflectance Indices

The objectives of this study were to assess the potential of using spectral reflectance indices (SRIs) as an indirect selection tool for grain yield in wheat under irrigated conditions. This paper demonstrates the genetic correlation between grain yield and SRIs, heritability and expected response to selection for grain yield and SRIs, correlated response to selection for grain yield estimated from SRIs, and efficiency of indirect selection for grain yield using SRIs in different spring wheat populations. Four field experiments, GHIST (15 CIMMYT globally adapted genotypes), RLs1 (25 random F3-derived families), RLs2 (36 random F3-derived families), and RLs3 (64 random F5-derived families) were conducted under irrigated conditions at the CIMMYT research station in north-west Mexico in 3 different years. Spectral reflectance was measured at 3 growth stages (booting, heading, and grain filling) and 7 SRIs were calculated using average values of spectral reflectance at heading and grain filling. Five previously developed SRIs (PRI, WI, RNDVI, GNDVI, SR), and 2 newly calculated SRIs (NWI-1 and NWI-2) were evaluated in the experiments. In general, the within- and between-year genetic correlations between grain yield and SRIs were significant. Three NIR-based indices (WI, NWI-1, and NWI-2) showed higher genetic correlations (0.73–0.92) with grain yield than the other indices (0.35–0.67), and these observations were consistent in all populations. Broad-sense heritability estimates for all indices were in general moderate to high (0.60–0.80), and higher than grain yield (0.45–0.70). The realised heritability for the 3 NIR-based indices was higher than for the other indices and for grain yield itself. Expected response to selection for all indices was moderate to high (0.54–0.85). The correlated response for grain yield estimated from the 3 NIR-based indices (0.59–0.64) was much higher than the correlated response for grain yield estimated from the other indices (0.31–0.46), and the efficiency of indirect selection for these 3 NIR-based indices was 90–96% of the efficiency of direct selection for grain yield. These results demonstrate the potential for using the 3 NIR-based SRI tools in breeding programs for selecting for increased genetic gains for yield.

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