Bonamico¹ NC, MG Balzarini², AT Arroyo², MA Ibañez¹, DG Díaz³, JC Salerno³, MA Di Renzo¹

Phyton-International Journal of Experimental Botany, Vol.79, pp. 31-38, 2010, DOI:10.32604/phyton.2010.79.031

Abstract Resistance to Mal de Río Cuarto (MRC) disease in maize (Zea mays L.) is important in Argentina because the crop area involves a wide region where the disease is endemic. Molecular marker-assisted selection could be used as an additional selection tool to enhance precision of the genotype selection for resistance. It demands the identification of informative markers. Microsatellite (SSR) markers linked to gene(s) associated with resistance to MRC have been reported from previous QTL analyses. These analyses have been made on linkage maps derived from a relatively early mapping population. In advanced populations, where highly distinct… More >

De la Cruz-Lázaro E¹, G Castañón-Najera², NP Brito-Manzano¹, A Gómez-Vázquez¹, V Robledo-Torres³, AJ Lozano del Río³

Phyton-International Journal of Experimental Botany, Vol.79, pp. 11-17, 2010, DOI:10.32604/phyton.2010.79.011

Abstract Estimation of genetic parameters using diallel crosses experiments aids to objective decision making in plant breeding programs. The objectives of this study were to estimate heterosis, the general combining ability (GCA) of eight tropical maize populations, and the specific combining ability (SCA) of 28 crosses. The populations evaluated were: population 21, 22, 23, 25, 32, 43, 49 and the commercial variety VS 536. The Griffing method 2 design was utilized to estimate GCA and SCA effects, on a complete randomized block design with two replications, at two planting dates. The diallel analysis showed significant differences… More >

CLAUDIA NOME^1*, PAULO CÉSAR MAGALHÃES², ELIZABETH OLIVEIRA², SERGIO NOME, IRMA GRACIELA LAGUNA¹

BIOCELL, Vol.33, No.2, pp. 133-136, 2009, DOI:10.32604/biocell.2009.33.133

Abstract Maize plants infected with Spiroplasma kunkelii show symptoms similar to that of plants in a magnesium-deficient soil, and it has been shown that the spiroplasma alters the plants’ magnesium absorption. In the current study we compared changes associated to either spiroplasma infection, two soil magnesium levels and their combinations. Plant symptoms were recorded and correlated with transmission electron microscopy observations. Plants grown on a high magnesium treatment showed no macroscopical alterations nor organelle ultrastructural alterations, while plants on a low magnesium treatment showed macroscopical vein yellowing and, ultrastructurally, they had most chloroplasts and mitochondrial membranes altered.… More >

Torroba MC, HA Paccapelo, L Aguilera, J Mazzola

Phyton-International Journal of Experimental Botany, Vol.77, pp. 93-102, 2008, DOI:10.32604/phyton.2008.77.093

Abstract An optimized methodology for improving regeneration of maize plants by direct organogenesis was evaluated. Our objective was to embarobtain genetically homogeneous plants through in vitro methods to regenerate clumps of multiple shoots from shoot tips at high frequency. Cultures were initiated from shoot tips of experimental lines of maize on a Murashige & Skoog (MS) medium supplemented with 2 mg/l benziladenine. Two experimental forage maize lines were used, in which two frequencies of subcultures were evaluated, namely line L. 850 (every 15 or 30 days) and line L.769 (every 30 days). It was observed that the More >

A. VIGLIOCCO^*, B. BONAMICO^*, S. ALEMANO^*, O. MIERSCH^**, G. ABDALA^*

BIOCELL, Vol.26, No.3, pp. 369-374, 2002, DOI:10.32604/biocell.2002.26.369

Abstract In the present paper we study the possible biological relevance of endogenous jasmonic acid (JA) and exogenous salicylic acid (SA) in a plant-microbial system maize-virus. The virus disease "Mal de Río Cuarto" is caused by the maize rough dwarf virus - Río Cuarto. The characteristic symptoms are the appearance of galls or "enations" in leaves, shortening of the stem internodes, poor radical system and general stunting. Changes in JA and protein pattern in maize control and infected plants of a virus-tolerant cultivar were investigated. Healthy and infected-leaf discs were collected for JA measurement at… More >