scholarly journals COMBINING ABILITIES OF GRAIN YIELD AND YIELD RELATED TRAITS IN RELATION TO DROUGHT TOLERANCE IN TEMPERATE MAIZE BREEDING

2015 ◽  
Vol 20 (2) ◽  
Author(s):  
Sekip ERDAL ◽  
Mehmet PAMUKCU ◽  
Ahmet OZTURK ◽  
Köksal AYDINSAKIR ◽  
Suleyman SOYLU
Keyword(s):  
Drought Tolerance ◽  
Grain Yield ◽  
Maize Breeding ◽  
Combining Abilities

scholarly journals Agronomic and molecular evaluation of maize inbred lines for drought tolerance

2016 ◽  
Vol 14 (4) ◽  
pp. e0711 ◽  
Author(s):  
Sanja Mikić ◽  
Miroslav Zorić ◽  
Dušan Stanisavljević ◽  
Ankica Kondić-Špika ◽  
Ljiljana Brbaklić ◽  
...  
Keyword(s):  
Drought Tolerance ◽  
Grain Yield ◽  
Maize Yield ◽  
Field Trials ◽  
Inbred Lines ◽  
Partial Least Square ◽  
Least Square ◽  
Maize Breeding ◽  
Heterotic Groups ◽  
Maize Inbred Lines

Drought is a severe threat to maize yield stability in Serbia and other temperate Southeast European countries occurring occasionally but with significant yield losses. The development of resilient genotypes that perform well under drought is one of the main focuses of maize breeding programmes. To test the tolerance of newly developed elite maize inbred lines to drought stress, field trials for grain yield performance and anthesis silk interval (ASI) were set in drought stressed environments in 2011 and 2012. Inbred lines performing well under drought, clustered into a group with short ASI and a smaller group with long ASI, were considered as a potential source for tolerance. The former contained inbreds from different heterotic groups and with a proportion of local germplasm. The latter consisted of genotypes with mixed exotic and Lancaster germplasm, which performed better in more drought-affected environments. Three inbreds were selected for their potential drought tolerance, showing an above-average yield and small ASI in all environments. Association analysis indicated significant correlations between ASI and grain yield and three microsatellites (bnlg1525, bnlg238 and umc1025). Eight alleles were selected for their favourable concurrent effect on yield increase and ASI decrease. The proportion of phenotypic variation explained by the markers varied across environments from 5.7% to 22.4% and from 4.6% to 8.1% for ASI and yield, respectively. The alleles with strongest effect on performance of particular genotypes and their interactions in specific environments were identified by the mean of partial least square interactions analysis indicating potential suitability of the makers for tolerant genotype selection.

scholarly journals Identification of QTL-s for drought tolerance in maize, II: Yield and yield components

Genetika ◽  
2013 ◽  
Vol 45 (2) ◽  
pp. 341-350 ◽  
Author(s):  
Ana Nikolic ◽  
Violeta Andjelkovic ◽  
Dejan Dodig ◽  
Snezana Mladenovic-Drinic ◽  
Natalija Kravic ◽  
...  
Keyword(s):  
Drought Tolerance ◽  
Grain Yield ◽  
Yield Components ◽  
Phenotypic Variability ◽  
Interval Mapping ◽  
Field Trials ◽  
Chromosome 9 ◽  
Yield Potential ◽  
Maize Breeding ◽  
Yield And Yield Components

Grain yield is the primary trait of interest in maize breeding programs. Worldwide, drought is the most pervasive limitation to the achievement of yield potential in maize. Drought tolerance of maize has been considerably improved through conventional breeding. Traditional breeding methods have numerous limitations, so development of new molecular genetics techniques could help in elucidation of genetic basis of drought tolerance .In order to map QTLs underlying yield and yield components under drought 116 F3 families of DTP79xB73 cross were evaluated in the field trials. Phenotypic correlations calculated using Pearson?s coefficients were high and significant. QTL detection was performed using composite interval mapping option in WinQTL Cartographer v 2.5. Over all nine traits 45 QTLs were detected: five for grain yield per plant and 40 for eight yield components. These QTLs were distributed on all chromosomes except on chromosome 9. Percent of phenotypic variability determined for the identified QTLs for all the traits was in the range from 27.46 to 95.85%. Different types of gene action were found for the QTLs identified for analyzed traits.

scholarly journals Aspects in breeding maize for drought tolerance: Progress and modern breeding approaches

2021 ◽  
pp. 810-817
Author(s):  
Aleck Kondwakwenda ◽  
Julia Sibiya ◽  
Rebecca Zengeni ◽  
Cousin Musvosvi
Keyword(s):  
Drought Tolerance ◽  
Grain Yield ◽  
Subsequent Development ◽  
Genotype By Environment Interaction ◽  
Environment Interaction ◽  
Maize Breeding ◽  
Maize Varieties ◽  
Drought Conditions ◽  
Breeding Programmes ◽  
Secondary Traits

Breeding for drought tolerance in plants is challenging because it is controlled by multiple genes. Grain yield, the trait of primary interest in maize, is characterized by low heritability, high genotype by environment interaction, and low variation under drought conditions, which further complicates selection. To circumvent these challenges, secondary traits that are highly correlated with grain yield are indirectly selected under drought conditions. Although considerable success in terms of yield gains under drought stress has been reported in both temperate and tropical maize breeding programmes, climate change exacerbated droughts coupled with high population growth necessitates continuous improvement of maize varieties. Understanding the genetics of associated secondary traits is essential in elucidating drought tolerance. The identification of quantitative trait loci (QTL) and candidate genes conferring drought tolerance and the subsequent development of relevant molecular markers ushered in the era of molecular assisted breeding. There is empirical evidence that marker-assisted selection and genomic selection have great potential to increase the yield gains while comprehensive and accurate phenotyping using secondary traits remains the pillar of drought tolerance breeding

OsNAC5overexpression enlarges root diameter in rice plants leading to enhanced drought tolerance and increased grain yield in the field

2012 ◽  
Vol 11 (1) ◽  
pp. 101-114 ◽  
Author(s):  
Jin Seo Jeong ◽  
Youn Shic Kim ◽  
Mark C. F. R. Redillas ◽  
Geupil Jang ◽  
Harin Jung ◽  
...  
Keyword(s):  
Drought Tolerance ◽  
Grain Yield ◽  
Root Diameter ◽  
Rice Plants

scholarly journals The Cytoplasm Origin Influence, the Teser Influence and the Nucleus-Cytoplasm Interactions Influence on Agronomic Traits for Maize Isonuclear Lines

2011 ◽  
Vol 68 (1) ◽  
Author(s):  
Camelia RACZ ◽  
Ioan HAS ◽  
Voichita HAS ◽  
Teodora ŞCHIOP ◽  
I COSTE
Keyword(s):  
Grain Yield ◽  
Dry Matter ◽  
Agronomic Traits ◽  
Vegetation Period ◽  
Negative Influence ◽  
Inbred Lines ◽  
Maize Breeding ◽  
High Productivity ◽  
Nucleus Transfer ◽  
Genetic Value

The maize is one of the most important crops in the world due to its high productivity and multiplexing usage in human nutrition, animal breeding and industry. The isonucleus inbred lines study has been initiated from the demand of clarifying if the cytoplasm source has a positive or negative influence on the corn cars, plants, grain traits and some maize cultural features. The research has been conducted in the experimental field provided by the Maize Breeding laboratory from ARDS Turda, ARDB Târgu-Mureş, ARDS Secuieni, ARDS Livada, ARDS Suceava in 2009. The cell nucleus transfer activity for 12 elite inbred lines on various cytoplasm types has begun in 1992 starting from the assumption that among cytoplasm of different origin could exist differences in the genetic value. The ultimate objective of breeding works is to obtain a higher grain yield and the yield quality to be at the desired level of farmers. For this reason it was studied the effect of different types of cytoplasm on grain yield, kernel dry matter at harvest and unbroken plants percentage at harvest, all these traits are important to achieve secure yield, mechanized harvestable. The kernel dry matter at harvest is one of the indicators of vegetation period, the most used in choice of early single crosses.

scholarly journals Selección temprana de líneas S1 de maíz ricas en lisina: I probadores.

2016 ◽  
Vol 9 (2) ◽  
pp. 65
Author(s):  
María Cristina Vega ◽  
Enrique Navarro ◽  
José Espinoza ◽  
Gustavo A. Buciaga ◽  
José Luis Guerrero
Keyword(s):  
Grain Yield ◽  
Block Design ◽  
Agronomic Performance ◽  
Lysine Content ◽  
Fusarium Spp ◽  
Maize Breeding ◽  
High Lysine ◽  
Genetic Base ◽  
Randomized Complete Block Design ◽  
Normal Performance

This research involved ninety-six S1 maize lines with the opaque-2 gene that carne from populations 63 (26 lines), 65 (12 lines), and 68 (58 lines) from the CIMMYT maize breeding programo The S1 lines selected in the laboratory because of their high lysine content were crossed with five testers that had a different genetic base: a synthetic variety, two early lines derived from this variety, and two single intermediate crosses of normal performance. The test crosses were evaluated and compared with five control s (two commercial and three experimental hybrids) using a randomized complete block design in two sites in Mexico during 1992. The objecti ves of this research were to select SI lines in early generations according to their agronomic performance, grain lysine content, and GCA grain yield, and to compare testers' efficiency in discriminating S1 lines. On average, the SI lines of population 63 showed a greater grain yield as compared to that of populations 65 and 68 combined with all testers, except in the case of the synthetic tester YS- 201-M. A line from population 65 combined with tester B3 x B5 showed the highest grain yield (10,23 t ha-I), representing a superiority of 4% above the best commercial hybrid, AN- 447. A total ofthirty-one Sllines were selected based on their agronomic attributes and grain yield: 13, 14, and 4 from populations 63, 65 and 68 respectively]. Tester B3 x B5 tumed out to be the best line discriminator according to the following criteria: grain yield, percentage of ears damaged by Fusarium spp., and number of rotten ears.

High-yielding NERICA mutant rice for upland areas and hope for Bangladeshi farmers.

2021 ◽  
pp. 53-64
Author(s):  
Mirza Mofazzal Islam ◽  
Shamsun Nahar Begum ◽  
Rigyan Gupta
Keyword(s):  
Drought Tolerance ◽  
Grain Yield ◽  
Crop Production ◽  
Upland Rice ◽  
Vital Role ◽  
High Yield ◽  
Rice Varieties ◽  
Commercial Cultivation ◽  
Drought Tolerant ◽  
Different Doses

Abstract Drought is an important stress phenomenon in Bangladesh that greatly hampers crop production. So, it is imperative to develop drought-tolerant rice varieties. Low-yielding, non-uniform flowering and late-maturing Africa rice - New Rice for Africa (NERICA), viz. NERICA-1, NERICA-4 and NERICA-10 varieties - were irradiated with different doses of gamma-rays (250, 300 and 350 Gy) in 2010. M1 plants were grown and M2 plants were selected based on earliness and higher grain yield. The desired mutants along with other mutants were grown as the M3 generation during 2011. A total of 37 mutants from NERICA-1, NERICA-4 and NERICA-10 were selected on the basis of plant height, short duration, drought tolerance and high yield in the M4 generation. In the M5 generation, six mutants were selected for drought tolerance, earliness, grain quality and higher yield. With respect to days to maturity and grain yield (t/ha), the mutant N1/250/P-2-6-1 of NERICA-1 matured earlier (108 days) and had higher grain yield (5.1 t/ha) than the parent. The mutant N4/350/P-4(5) of NERICA-4 also showed a higher grain yield (6.2 t/ha) than its parent and other mutants. On the other hand, NERICA-10 mutant N10/350/P-5-4 matured earlier and had a higher yield (4.5 t/ha) than its parent. Finally, based on agronomic performance and drought tolerance, the two mutants N4/350/P-4(5) and N10/350/P-5-4 were selected and were evaluated in drought-prone and upland areas during 2016 and 2017. These two mutants performed well with higher grain yield than the released upland rice varieties. They will be released soon for commercial cultivation and are anticipated to play a vital role in food security in Bangladesh.

Molecular breeding for improving yield in maize: recent advances and future perspectives.

2021 ◽  
pp. 380-404
Author(s):  
Mei-ping Zhang ◽  
Yun-Hua Liu ◽  
Hong-Bin Zhang
Keyword(s):  
Grain Yield ◽  
Plant Breeding ◽  
Molecular Basis ◽  
Maize Yield ◽  
Future Perspectives ◽  
Maize Breeding ◽  
Yield Improvement ◽  
Maize Grain Yield ◽  
The Past ◽  
Recent Advances

Abstract This chapter clarifies plant breeding and its underlying molecular basis, then reviews the molecular technologies that have been developed thus far for enhanced plant breeding, which are necessary to better understand the applications and perspectives of these molecular technologies for enhanced maize breeding. This chapter updates the recent advances of the molecular technologies for maize grain yield breeding in the past decade and compares these molecular technologies and underlines their perspectives for continued maize yield improvement.

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