scholarly journals Combining Ability and Heterosis of Algerian Saharan Maize Populations (Zea mays L.) for Tolerance to No-Nitrogen Fertilization and Drought

Agronomy ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 492
Author(s):  
Meriem Riache ◽  
Pedro Revilla ◽  
Oula Maafi ◽  
Rosa Ana Malvar ◽  
Abderahmane Djemel
Keyword(s):  
Zea Mays ◽  
Stress Tolerance ◽  
Nitrogen Fertilization ◽  
Recurrent Selection ◽  
Zea Mays L ◽  
Base Material ◽  
N Fertilization ◽  
Nitrogen Stress ◽  
Reciprocal Recurrent Selection ◽  
Maize Populations

Drought and low nitrogen are major stresses for maize (Zea mays L.), and maize populations from the Sahara Desert are potential sources of stress tolerance. The objectives were to assess the tolerance and varietal and heterosis effects of Algerian populations under no-nitrogen fertilization and water stress. A diallel among six Algerian maize population was evaluated under drought (300 mm irrigation) vs. control (600 mm) and no-nitrogen fertilization vs. 120 kh ha−1 N fertilization. Genotypes showed significant differences and genetic effects for water- and nitrogen-stress tolerance. We propose a reciprocal recurrent selection to take advantage of additive and non-additive effects, using AOR and IGS, since they showed good performance in optimum and stress conditions, for improving yield heterosis for AOR × IGS. Negative effects are not expected on plant height, anthesis–silking interval or early vigor. These populations and BAH could be sources of inbred lines tolerant to drought and no-nitrogen fertilization. There was no relationship between origin and genetic group and stress tolerance per se or as parents of tolerant crosses. These populations and crosses could be used as base material among Algerian populations, for breeding programs focusing on tolerance to water or nitrogen stress.

scholarly journals Changes in heterosis of maize (Zea mays L.) varietal cross hybrids after four cycles of reciprocal recurrent selection

2019 ◽  
Vol 47 (1) ◽  
pp. 145-156
Author(s):  
A.O. Kolawole ◽  
A. Menkir ◽  
E. Blay ◽  
K. Ofori ◽  
J.G. Kling
Keyword(s):  
Zea Mays ◽  
Recurrent Selection ◽  
Zea Mays L ◽  
Reciprocal Recurrent Selection

scholarly journals Isoenzymatic variability in tropical maize populations under reciprocal recurrent selection

2003 ◽  
Vol 60 (2) ◽  
pp. 291-297 ◽  
Author(s):  
Luciana Rossini Pinto ◽  
Maria Lúcia Carneiro Vieira ◽  
Cláudio Lopes de Souza Jr. ◽  
Rainério Meireles da Silva
Keyword(s):  
Genetic Variability ◽  
Recurrent Selection ◽  
Zea Mays L ◽  
Genetic Distances ◽  
Reciprocal Recurrent Selection ◽  
Tropical Maize ◽  
Effective Population ◽  
Selection Procedures ◽  
Maize Populations ◽  
Population Sizes

Maize (Zea mays L.) is one of the crops in which the genetic variability has been extensively studied at isoenzymatic loci. The genetic variability of the maize populations BR-105 and BR-106, and the synthetics IG-3 and IG-4, obtained after one cycle of a high-intensity reciprocal recurrent selection (RRS), was investigated at seven isoenzymatic loci. A total of twenty alleles were identified, and most of the private alleles were found in the BR-106 population. One cycle of reciprocal recurrent selection (RRS) caused reductions of 12% in the number of alleles in both populations. Changes in allele frequencies were also observed between populations and synthetics, mainly for the Est 2 locus. Populations presented similar values for the number of alleles per locus, percentage of polymorphic loci, and observed and expected heterozygosities. A decrease of the genetic variation values was observed for the synthetics as a consequence of genetic drift effects and reduction of the effective population sizes. The distribution of the genetic diversity within and between populations revealed that most of the diversity was maintained within them, i.e. BR-105 x BR-106 (G ST = 3.5%) and IG-3 x IG-4 (G ST = 4.0%). The genetic distances between populations and synthetics increased approximately 21%. An increase in the genetic divergence between the populations occurred without limiting new selection procedures.

NITROGEN FERTILIZATION OF LAND CONTINUOUSLY CROPPED TO CORN (Zea mays L.)

1983 ◽  
Vol 63 (3) ◽  
pp. 547-556 ◽  
Author(s):  
JOHN E. RICHARDS ◽  
S. C. SHEPPARD ◽  
T. E. BATES
Keyword(s):  
Zea Mays ◽  
Regression Analysis ◽  
Nitrogen Fertilization ◽  
Zea Mays L ◽  
Continuous Production ◽  
Field Trials ◽  
N Fertilization ◽  
Grain Production ◽  
N Application ◽  
Rate Interaction

Three field trials were conducted to determine if and how response of corn (Zea mays L.) to applied N changes during continuous production. Nitrogen was broadcast at rates of 0, 56, 112, 168, 224 and 336 kg/ha each year for 10 yr. Rates of N in excess of 168 kg/ha significantly reduced emergence at the Fox site; no effect occurred elsewhere. Applied N had no effect upon seedling weight, decreased the interval from seeding to silking, and increased grain and stover yields at all sites. The most profitable rates of N for grain production throughout the study were 85 and 110 kg/ha at the Conestogo and Fox sites, respectively. At the Chinguacousy site, there was a significant year by N rate interaction with grain yield declining by 5600 kg/ha over 10 yr in the 0-kg-N/ha treatment. A model developed by multiple regression analysis (R2 = 0.71) for this site predicted that the most profitable rates of N application were 38, 178, and 213 kg/ha in years 1, 5, and 10, respectively. Applied N decreased ear moisture content at harvest and increased lodging at all sites. Key words: Zea mays L., N fertilization, year by N interaction

scholarly journals Comparison of two methods of reciprocal recurrent selection in maize (Zea mays L.)

2012 ◽  
Vol 124 (7) ◽  
pp. 1183-1191 ◽  
Author(s):  
B. Ordas ◽  
A. Butron ◽  
A. Alvarez ◽  
P. Revilla ◽  
R. A. Malvar
Keyword(s):  
Zea Mays ◽  
Recurrent Selection ◽  
Zea Mays L ◽  
Reciprocal Recurrent Selection

scholarly journals Performance of maize single-crosses developed from populations improved by a modified reciprocal recurrent selection

2010 ◽  
Vol 67 (2) ◽  
pp. 198-205 ◽  
Author(s):  
Cláudio Lopes de Souza Jr. ◽  
Sanzio Carvalho Lima Barrios ◽  
Gustavo Vitti Moro
Keyword(s):  
Zea Mays ◽  
Recurrent Selection ◽  
Zea Mays L ◽  
Selection Procedure ◽  
Inbred Lines ◽  
Reciprocal Recurrent Selection ◽  
Relative Contribution ◽  
Diallel Mating Design ◽  
Single Cross ◽  
Partial Diallel

Maize (Zea mays L.) elite inbred lines developed from pedigree programs tend to be genetically related. Therefore, it is necessary to incorporate unrelated inbreds to those programs to allow the continued release of outstanding single-crosses. The objectives of this research were to compare the usefulness of a modified reciprocal recurrent selection procedure (MRRS) to improve populations to be used as sources of elite inbreds and outstanding single-crosses to integrate pedigree programs, and to investigate the effects of selection on the relative contribution of general (GCA) and specific combining (SCA) abilities to the single-crosses variation. Eight and six S3 lines from populations IG-3-C1 and IG-4-C1, respectively, selected from the first cycle of the MRRS program were crossed in a partial-diallel mating design, and the 48 experimental and five commercial single-crosses were evaluated in six environments. Grain yield mean of the experimental single-crosses (9.57 t ha¹) did not differ from the commercial single-crosses (9.86 t ha¹), and ten of the 48 experimental single-crosses could be released as cultivars because they compared favorably to the currently used single-crosses. Thus, one cycle of the MRRS procedure improved efficiently the populations allowing the development of outstanding single-cross, but additional cycles of selection should be carried out since none of the experimental single-crosses outperformed the highest yielding commercial single-cross. The relative contribution of the GCA over SCA may have been affected by the MRRS, since the SCA was more important than GCA for some of the traits assessed.

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