Combining ability and genetic divergence among tropical maize inbred lines using SSR markers

Eisele, Tauana Gibim; Lazzari, Dener; Silva, Tereza Aparecida da; Pinto, Ronald José Barth; Matsuzaki, Robson Akira; Maioli, Maria Fernanda de Souza Dias; Alves, Alex Viana; Amaral, Antônio Teixeira do

doi:10.4025/actasciagron.v43i1.53317

“…Finally, the result is in line with several researchers report. Accordingly, the result of this finding agrees with [36,18,13,31,10,35,9] they were found positive and negative significant GCA effect for the same traits.…”

Section: General Combining Ability Effect Estimatessupporting

confidence: 91%

“…On other hand, L6, L9, T3 and T4 were showed significantly negative GCA effects for GY, indicating, that these inbred lines and testers were not good combiner within this group of inbred lines and may not be exploited for GY advancement. Matched with the current study, several authors reported either positive or negative significant GCA effects of inbred lines for GY in other group of inbred lines [31,10,27,9] . For ASI, all lines and testers showed negative and positive nonsignificant GCA effects.…”

Section: General Combining Ability Effect Estimatessupporting

confidence: 67%

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2022

Int. J. Res. Agron.

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Even though maize is an essential cereal crop for food security, many foliar diseases provide the biggest dangers to and constraints on the country's maize production, leading to low yields, particularly of highquality protein maize (QPM). As a result, Ethiopia's national maize research program has published QPM maize varieties that are suitable for the nation's highland, mid-altitude, and low moisture stress agroecologies. However, because of these and other characteristics that have restricted farmers from adopting them, the market share of these types is often low. One of the effective tools for finding the best combiners that may be employed in crosses to accumulate biotic resistance and productive alleles is general and specific combining ability study. During the 2019/2020 main season at Bako and Jimma, a line x tester analysis comprising 36 crossings produced by crossing 9 chosen maize inbred lines with 4 testers was assessed for several desirable agronomic features. The experiment's goal was to ascertain the QPM inbred lines' GCA and SCA combining prowess in relation to key foliar diseases and Ethiopia's mid-altitude agroecology. Three replications by an alpha-lattice pattern were used to analyze the crossings. Grain yield, Turicum leaf blight, Grey Leaf Spot, Common Rust Disease Severity Index, Days to Silking Interval, and Days to Maturity were all noted for study. For almost all of the qualities under study, mean squares analysis of variance revealed significant mean squares attributable to crosses. The majority of the examined traits had significant GCA mean squares attributable to lines and tests. The majority of features and the most prevalent foliar maize diseases across locations were likewise significant using SCA mean squares. The current study found that for the majority of examined variables, GCA and SCA variants were of comparable relevance. A negative and extremely significant GCA effect was seen for husk cover in the inbred lines L1, L2, L5, and L8. From this research, it can be concluded that significant foliar diseases of maize, higher performing hybrids, inbred lines with desirable GCA and cross combinations with desirable SCA effects for grain production, and other features were successfully identified.

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“…On other hand, L6, L9, T3 and T4 were showed significantly negative GCA effects for GY, indicating, that these inbred lines and testers were not good combiner within this group of inbred lines and may not be exploited for GY advancement. Matched with the current study, several authors reported either positive or negative significant GCA effects of inbred lines for GY in other group of inbred lines [31,10,27,9] . For ASI, all lines and testers showed negative and positive nonsignificant GCA effects.…”

Section: General Combining Ability Effect Estimatessupporting

confidence: 64%

General and specific combining ability of quality protein maize (Zea mays L.) inbred lines for major foliar diseases and other agronomic traits at mid-altitude of Ethiopia

Yadesa¹,

Diro²,

Tafa³

2022

Int. J. Res. Agron.

0

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Even though maize is an essential cereal crop for food security, many foliar diseases provide the biggest dangers to and constraints on the country's maize production, leading to low yields, particularly of highquality protein maize (QPM). As a result, Ethiopia's national maize research program has published QPM maize varieties that are suitable for the nation's highland, mid-altitude, and low moisture stress agroecologies. However, because of these and other characteristics that have restricted farmers from adopting them, the market share of these types is often low. One of the effective tools for finding the best combiners that may be employed in crosses to accumulate biotic resistance and productive alleles is general and specific combining ability study. During the 2019/2020 main season at Bako and Jimma, a line x tester analysis comprising 36 crossings produced by crossing 9 chosen maize inbred lines with 4 testers was assessed for several desirable agronomic features. The experiment's goal was to ascertain the QPM inbred lines' GCA and SCA combining prowess in relation to key foliar diseases and Ethiopia's mid-altitude agroecology. Three replications by an alpha-lattice pattern were used to analyze the crossings. Grain yield, Turicum leaf blight, Grey Leaf Spot, Common Rust Disease Severity Index, Days to Silking Interval, and Days to Maturity were all noted for study. For almost all of the qualities under study, mean squares analysis of variance revealed significant mean squares attributable to crosses. The majority of the examined traits had significant GCA mean squares attributable to lines and tests. The majority of features and the most prevalent foliar maize diseases across locations were likewise significant using SCA mean squares. The current study found that for the majority of examined variables, GCA and SCA variants were of comparable relevance. A negative and extremely significant GCA effect was seen for husk cover in the inbred lines L1, L2, L5, and L8. From this research, it can be concluded that significant foliar diseases of maize, higher performing hybrids, inbred lines with desirable GCA and cross combinations with desirable SCA effects for grain production, and other features were successfully identified.

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“…Maize (Zea mays L.) is playing main role in human and livestock nutrition worldwide and is used for several industrial purposes such as oil and starch [11]. Internationally, maize is known as queen of cereals because of its highest genetic yield potential.…”

Section: Introductionmentioning

confidence: 99%

Combining abilities and genetic parameters for grain yield and some agronomic traits in maize (Zea mays L.)

Habiba

¹

,

El-Diasty

²

,

Aly

³

2022

Beni-Suef Univ J Basic Appl Sci

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Background The improvement of maize hybrids relies on significant genetic variability among the inbred lines used and the degree to which it is transferred to progeny. Understanding the genetic parameters and heritability of traits in every population is an essential precondition for selection program. This study was designed to estimate the magnitude of genetic parameters and heritability of traits in line × tester mating design. Fifteen yellow maize inbred lines derived from different sources were crossed with two lines as tester i.e., Gm-1001 and Gm-1002 in 2019 summer season. During 2020 season, the resulted 30 crosses along with check hybrid SC-168 were evaluated in a yield trial at two locations: Gemmeiza and Sids Agric. Res. Station. Results The mean squares among two locations were highly significant for all studied traits except KR−1. The L1 and L3 had the best general combiners for GY ard fed−1. In addition, the T1 as a tester was a GCA effects good combiner for earliness, shorter plants and lower ear placement traits. While T2 was good combiner for grain yield and some of attributes. Crosses L5 × T1 and L7 × T2 had positive and significant SCA effects for grain yield. The GCA variances were higher than SCA variances for all studied traits except for ED trait, indicating that additive genetic variance played the major role than non-additive genetic variance in the inheritance of these traits. Generally, phenotypic coefficient of variability was higher than genotypic coefficient of variability for all studied traits, suggesting that there was an influence by environments in the expression of these traits. Recorded heritability percentage in broad sense ranged from low for (ear position%, no. of ears/100 plants, ear diameter and grain yield) traits, medium for (days to 50% silking, plant height, ear height and no. of kernels/row) traits to moderate high for ear length trait. Conclusion Our investigation concluded that most of the studied lines exhibited highly general combiners and the superior crosses were as a result of a good × good combiner for most of yield components traits.

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Combining ability and genetic divergence among tropical maize inbred lines using SSR markers

Cited by 4 publications

References 53 publications

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General and specific combining ability of quality protein maize (Zea mays L.) inbred lines for major foliar diseases and other agronomic traits at mid-altitude of Ethiopia

Combining abilities and genetic parameters for grain yield and some agronomic traits in maize (Zea mays L.)

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