Inheritance of Nitrogen Use Efficiency in Inbred Progenies of Tropical Maize Based on Multivariate Diallel Analysis

Guedes, Fernando Lisboa; Diniz, Rafael Parreira; Balestre, Márcio; Ribeiro, Cauê; Camargos, Renato Barbosa; Souza, João Cândido de

doi:10.1155/2014/894710

Cited by 3 publications

(2 citation statements)

References 18 publications

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“…Considering that the difference in grain yield between the two environments was approximately 548 kg ha -1 and that the difference of N applied was 100 kg, the mean response of kg of grains produced per kg of N applied was approximately 5.5 kg. These results are a magn itude lower than those found by Guedes et al (2014), who found a mean response of 17 and 24 kg of grains per kg of N applied in maize crops, respectively. However, these results can be attributed to low water availability and stressful factors present in the off-season, which reduces the potential of the crop response to N application.…”

Section: Resultscontrasting

confidence: 77%

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Selection of parents for low nitrogen stress through the combining ability of maize partially inbred lines

et al. 2019

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The objective of this work was to estimate the general combining ability of partially inbred lines under high and low nitrogen (N) conditions and to select promising lines to obtain high yields for both conditions. Fifty-five partially inbred S1 progenies were evaluated using the top-cross method, where the lines were crossed with two testers. The 110 top-cross hybrids were evaluated for grain yield during the off-season of 2012 at two sites in the Brazilian Midwest. Partial diallel analysis was performed with the adjusted means of each of the individual analyses of the top crosses. The combining ability of partially inbred lines and testers as well as their interaction with N levels, was estimated for each site. The coefficient of concordance among 15 partially inbred lines selected by the highest general combining ability estimates for each N level was 0.60. The S1 lines 39, 11, 41, 55, 38, 37, 6, 8, and 14 were selected at both N levels. This indicates that these lines can be used to identify ideal hybrids for growing in the off-season in the Brazilian Midwest.

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Section: Resultscontrasting

confidence: 77%

“…There was a significant effect for top-crosses, TCt1, TCt2, GCA, SCA and controls, which indicates the existence of genetic variability. Cancellier, Afférri, Carvalho, Dotto, and Leão (2011) and Guedes et al (2014) found similar results.…”

Section: Resultssupporting

confidence: 58%

Selection of parents for low nitrogen stress through the combining ability of maize partially inbred lines

et al. 2019

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Phenotypic and Genetic Parameters Estimated for Fresh Corn Under Different Nutrient Availability1

et al. 2021

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The objective of this work was to estimate and compare phenotypic and genetic parameters after three cycles of intrapopulation recurrent selection for fresh corn grown under three nutrient availability conditions. Three experiments derived from the same population (MV-003) were conducted to assess the ability of progenies to absorb nutrients, one under adequate fertilization (control; MV-006), one under low nitrogen availability (N; MV-006N), and one under low phosphorus availability (P; MV-006P). The experiments were carried out in randomized blocks, with 64 half-sib progenies and three replications for each nutritional condition. Chlorophyll index, plant height, ear insertion, ear diameter, ear length, unhusked ear yield, and marketable husked ear were evaluated. The populations showed variability for the three nutrient availability conditions. The variability reduced after only three selection cycles; thus, evaluating a higher number of half-sib progenies, above 64, under low N and P availability is indicated. The rates used to identify the most efficient progenies in breeding programs should be close to the appropriate one, with a slow reduction after the selection cycles. The variability will be thus maintained, with a greater possibility of identifying more promising progenies. In addition, the frequency of favorable alleles increases more gradually and effectively. The N and P rate of 60 kg ha-1 is not indicated as a critical level for the initial phase of the program.

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Maize Breeding for Low Nitrogen Inputs in Agriculture: Mechanisms Underlying the Tolerance to the Abiotic Stress

2023

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Nitrogen (N) is essential for sustaining life on Earth and plays a vital role in plant growth and thus agricultural production. The excessive use of N fertilizers not only harms the economy, but also the environment. In the context of the environmental impacts caused by agriculture, global maize improvement programs aim to develop cultivars with high N-use efficiency (NUE) to reduce the use of N fertilizers. Since N is highly mobile in plants, NUE is related to numerous little-known morphophysiological and molecular mechanisms. In this review paper we present an overview of the morpho-physiological adaptations of shoot and root, molecular mechanisms involved in plant response to low nitrogen environment, and the genetic effects involved in the control of key traits for NUE. Some studies show that the efficiency of cultivars growing under low N is related to deep root architecture, more lateral roots (LR), and sparser branching of LR, resulting in lower metabolic costs. The NUE cultivars also exhibit more efficient photosynthesis, which affects plant growth under suboptimal nitrogen conditions. In this sense, obtaining superior genotypes for NUE can be achieved with the exploitation of heterosis, as non-additive effects are more important in the expression of traits associated with NUE.

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Inheritance of Nitrogen Use Efficiency in Inbred Progenies of Tropical Maize Based on Multivariate Diallel Analysis

Cited by 3 publications

References 18 publications

Selection of parents for low nitrogen stress through the combining ability of maize partially inbred lines

Selection of parents for low nitrogen stress through the combining ability of maize partially inbred lines

Phenotypic and Genetic Parameters Estimated for Fresh Corn Under Different Nutrient Availability1

Maize Breeding for Low Nitrogen Inputs in Agriculture: Mechanisms Underlying the Tolerance to the Abiotic Stress

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