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Genetic variances for tolerance to soil acidity in a tropical maize population

By: Borrero, J.C.
Contributor(s): Bahia Filho, A.F.C [coaut.] | Ceballos, H [coaut.] | Magnavaca, R [coaut.] | Pandey, S [coaut.].
Material type: materialTypeLabelArticlePublisher: 1995Subject(s): Acid soils | Inheritance (genetics) | Research projects | Resistance to injurious factors | Selection | Tropical zones | Zea mays AGROVOC In: Maydica v. 40, no. 3, p. 283-288649161Summary: Maize (Zea mays) is grown on approximately eight million hectares of acidic soils, where yields are low because of the toxicity of Al and Mn and deficiency in Ca, Mg and P. A diallel study was conducted involving six soil-acidity tolerant and two susceptible segregating populations to identify superior germplasm with a view to developing cultivars for acidic soils. The eight populations and their 28 crosses were evaluated in seven acidic soil environments in 1992 (at Villavicencio, Carimagua and S. Quilichao, Colombia, and Sete Lagoas, Brazil). Tolerant populations averaged higher in yield (2.19 vs. 1.58 t ha-1; P<0.01), ears per plant (0.79 vs. 0.64; P<0.05) and ear height (61.6 vs. 51.4 cm; P<0.01), and lower in number of days to silk (68.8 vs. 69.7 days; P<0.05), than the susceptible populations. Mean squares of parents vs. crosses were highly significant for yield, ear height, and ears per plant, and significant for days to silk, indicating heterosis for these traits. Crosses between tolerant populations tended to yield higher (3 t ha-1) than those between tolerant and susceptible populations (2.4 t ha-1) and between susceptible populations (2.01 t ha-1). GCA was highly significant for all traits, but SCA was significant only for ears per plant. It is included that reciprocal recurrent selection would be effective in developing superior cultivars for acidic soils and that breeding programmes should include the resistant populations 90SA-3 and 90SA-4 or CMS-36 for yellow endosperm cultivars and 90SA-6 and 90SA-7 for white endosperm cultivarsCollection: CIMMYT Staff Publications Collection
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Item type Current location Collection Call number Copy number Status Date due Barcode Item holds
Article CIMMYT Knowledge Center: John Woolston Library

Lic. Jose Juan Caballero Flores

 

CIMMYT Staff Publications Collection CIS-2562 (Browse shelf) 1 Available 649161
Total holds: 0

AGRIS 96-153188

Peer-review: Yes - Open Access: Yes|http://science.thomsonreuters.com/cgi-bin/jrnlst/jlresults.cgi?PC=MASTER&ISSN=0025-6153

Maize (Zea mays) is grown on approximately eight million hectares of acidic soils, where yields are low because of the toxicity of Al and Mn and deficiency in Ca, Mg and P. A diallel study was conducted involving six soil-acidity tolerant and two susceptible segregating populations to identify superior germplasm with a view to developing cultivars for acidic soils. The eight populations and their 28 crosses were evaluated in seven acidic soil environments in 1992 (at Villavicencio, Carimagua and S. Quilichao, Colombia, and Sete Lagoas, Brazil). Tolerant populations averaged higher in yield (2.19 vs. 1.58 t ha-1; P<0.01), ears per plant (0.79 vs. 0.64; P<0.05) and ear height (61.6 vs. 51.4 cm; P<0.01), and lower in number of days to silk (68.8 vs. 69.7 days; P<0.05), than the susceptible populations. Mean squares of parents vs. crosses were highly significant for yield, ear height, and ears per plant, and significant for days to silk, indicating heterosis for these traits. Crosses between tolerant populations tended to yield higher (3 t ha-1) than those between tolerant and susceptible populations (2.4 t ha-1) and between susceptible populations (2.01 t ha-1). GCA was highly significant for all traits, but SCA was significant only for ears per plant. It is included that reciprocal recurrent selection would be effective in developing superior cultivars for acidic soils and that breeding programmes should include the resistant populations 90SA-3 and 90SA-4 or CMS-36 for yellow endosperm cultivars and 90SA-6 and 90SA-7 for white endosperm cultivars

English

CO-UNCP 1995 BORRERO M rf

CIMMYT Staff Publications Collection

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