Estimates of Heterosis among Temperate, Subtropical and Tropical Maize Germplasm

Malik, H. N.; Malik, Saad Imran; Chughtai, S. R.; Javed, Habib Iqbal

doi:10.3923/ajps.2004.6.10

Cited by 4 publications

(1 citation statement)

References 11 publications

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“…El carácter NHM tuvo una heterosis de -6.84 a 20.30 %, donde la cruza F1 (P2×P1) presentó la mayor heterosis. Esto contrastó con lo reportado por Malik et al (2004), quienes identificaron heterosis de hasta 49.6 % con respecto al progenitor medio en líneas de origen templado, subtropical y tropical.…”

Section: Heterosisunclassified

Rendimiento, Componentes De Rendimiento Y Heterosis De Germoplasma De Maíz Adaptado a Valles Altos

et al. 2019

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Las variedades de maíz (Zea mays L.) introducidas de otras latitudes son una fuente de alelos favorables de utilidad en el mejoramiento genético, pero antes de ser empleados deben adaptarse a las condiciones climáticas de los ambientes de interés. El objetivo del presente estudio fue evaluar el rendimiento y sus componentes en poblaciones representativas de razas de maíz originarias del trópico y subtrópico adaptadas por selección masal recurrente a los Valles Altos de México, así como la heterosis de sus cruzas interraciales para identificar genotipos útiles al mejoramiento genético del maíz para esos ambientes. Se evaluaron nueve poblaciones de maíz adaptado, ocho cruzas de dos poblaciones, una cruza de tres poblaciones, generaciones avanzadas de las cruzas y cuatro testigos comerciales. Los genotipos se evaluaron en tres ambientes bajo un diseño experimental de bloques completos al azar con tres repeticiones. Se registró el rendimiento y sus componentes. Se realizó análisis de varianza, comparación de medias (Tukey, P ≤ 0.05), análisis de correlación y se estimó la heterosis con respecto al progenitor medio. Hubo diferencias significativas (P ≤ 0.01) entre genotipos para todos los caracteres; los materiales adaptados rindieron de 3.89 a 11.71 t ha-1 y los testigos de 8.06 a 11.56 t ha-1. El rendimiento correlacionó con el índice de prolificidad (r = 0.67), longitud (r = 0.64), diámetro de mazorca (r = 0.65) y número de granos por hilera (r = 0.64). La heterosis promedio para rendimiento y sus componentes fluctuó de -5.30 a 6.53 %, con 5.68 % para rendimiento, donde la cruza F1 P9 × P8 presentó la mayor heterosis (26.19 %). Las poblaciones adaptadas y sus cruzas presentaron rendimientos similares a los testigos comerciales; por esto, pueden aprovecharse per se o como participantes para mejoramiento genético del maíz local de Valles Altos.

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Section: Heterosisunclassified

Rendimiento, Componentes De Rendimiento Y Heterosis De Germoplasma De Maíz Adaptado a Valles Altos

et al. 2019

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Heterosis and yield potentialities of promising maize hybrids suitable for Terai and inner Terai environments of Nepal

Gurung¹,

Pandey²,

Upadhyay³

et al. 2013

Agron J Nepal

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Heterosis has made a dramatic impact on the developing of breeding methods and high yields in many field crops during the 20th century. In general, heterosis is greatest in cross pollinated compared to self pollinated crops and thus widely exploited for hybrid cultivar development. Standard heterosis is one of the most important parameters in commercialization of maize hybrids. A new hybrid must be superior to the standard hybrids in terms of grain yield and other economic traits. We have analyzed four coordinated varietal trials of hybrids, 3 of which were conducted at NMRP, Rampur and another was tested at NMRP, Rampur and at ARS, Belachapi, Janakpur from 2006 to 2008 in order to determine the standard heterosis of the promising hybrids. The objective of this study was to evaluate hybrids under different production domains and to select superior hybrids for commercialization. Standard heterosis was calculated based on the best check hybrids and Indian commercial hybrids. The hybrids showed significant differences for grain yields and days to silking in all the trials. Standard heterosis of the tested hybrids ranged from - 39.4 to 47.8%. Most of the hybrids showed positive standard heterosis for grain yield. Hybrids namely; RML- 4/NML-2, RML-6/RML-8, NML-1/RML-8 in 2006 and RML-57/RL-174, NML-1/RML-6 and RL-197/NML-2 in 2008 had more than15% standard heterosis for grain yield evaluated at NMRP, Rampur. Hybrid between RML- 4/NML-2 had only shown positive standard heterosis in 2007 at NMRP, Rampur. RML-4/NML-2, NML-1/RL-17 and RL-111/RL-189 were superior hybrids, which had >15% standard heterosis across NMRP, Rampur and at ARS, Belachapi, Janakpur in 2008. Seed production aspect of these selected hybrids should be studied to develop a complete package of practices for F1 hybrid seed production. DOI: http://dx.doi.org/10.3126/ajn.v1i0.7544 Agronomy Journal of Nepal (Agron JN) Vol. 1: 2010 pp.67-73

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Assessment of Maize Genotypes for Forage Yield and Quality

Basıt¹,

Khaliq²,

Pervez³

et al. 2018

J. Plant Breed. Genet.

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The present study was targeted to evaluate eight maize advance lines in comparison to one local check for green fodder yield potential and nutritional quality. The experiment was conducted at Fodder Research Institute, Sargodha during August 2017. The experiment was sown in a randomized complete block design with three replications having a plot size of 2.4 m x 6 m. The crop was harvested at 50% flowering stage and data regarding plant height, Number of leaves per plant, leaf length, leaf width, leaf area, leaves weight per plant, stem weight per plant, leaves to stem weight ratio, green fodder yield, dry matter percentage, crude protein and crude fibre were recorded. The results showed that the performance of the advance lines; No.1501 and MS.2010 was best among all the studied genotypes in terms of fodder yield respectively. Both genotypes exhibited a good nutritional quality.

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Estimates of Heterosis among Temperate, Subtropical and Tropical Maize Germplasm

Cited by 4 publications

References 11 publications

Rendimiento, Componentes De Rendimiento Y Heterosis De Germoplasma De Maíz Adaptado a Valles Altos

Rendimiento, Componentes De Rendimiento Y Heterosis De Germoplasma De Maíz Adaptado a Valles Altos

Heterosis and yield potentialities of promising maize hybrids suitable for Terai and inner Terai environments of Nepal

Assessment of Maize Genotypes for Forage Yield and Quality

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