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vol.27 número1ESTADO DEL CONOCIMIENTO SOBRE EL CABRITO DEL FRAMBUESO (CF), AEGORHINUS SUPERCILIOSUS (GUÉRIN) (COLEOPTERA: CURCULIONIDAE)RESPUESTA DE LA LECHUGA HIDROPÓNICA A DISTINTOS TRATAMIENTOS DE NITRÓGENO: CRECIMIENTO Y CONTENIDO DE NITRÓGENO EN LAS HOJAS índice de autoresíndice de materiabúsqueda de artículos
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Idesia (Arica)

versión On-line ISSN 0718-3429

Resumen

CHAVEZ, René; SCHMIDT, Walter  y  GUTIERREZ, Gabriela. GENE TRANSFER OF EARLINESS AND COLD TOLERANCE TO HYBRID MAYZE POPULATION IN THE HIGHLAND ANDES OF SOUTHERN PERU. Idesia [online]. 2009, vol.27, n.1, pp.67-82. ISSN 0718-3429.  http://dx.doi.org/10.4067/S0718-34292009000100009.

Adapted cold tolerant maize germplasm is vastly cultivated in the semi-arid high Andean ecosystem from southern Peru on altitudes ranging from 2500 to 4000 masl and between 15º - 18º south latitude. An important part of maize production is the intensive utilization of about 20 open-pollinated native landraces for food preparation or preferred grain texture and color. Systematic collection, characterization and evaluation of the tropical highland maize landraces from southern Peru began in the early 2003, as part of a cooperative breeding research between the international KWS SAAT AG seed-breeding company from Einbeck, Germany and the Faculty of Agronomy of National University of Tacna, Peru. The native maize germplasm revealed enormous diversity and genetic variation in landraces, but shared some common phenotypic characters, such as, outstanding tolerance to low temperatures, very late growing period ranging from eight to nine months, and a remarkable resistance to lodging. However, heat tolerant and early tropical lowland maize can be harvested in the Peruvian coastal plains at 90-120 days, depending on the growing season. The establishment and conduction of this breeding project was carried out bearing in mind that geneflow from early-mature improved maize germplasm to the cold tolerant native landraces can be achieved without diminishing biodiversity. The utilization of about 15 cold tolerant native maize land races in this preliminary three years breeding research has generated up to date hybrid populations, mainly consisting of backcrossing, half-sib and full-sib progenies to make selections within and among them to develop inbred lines, hybrids, synthetics and varieties. Evaluation of phenotypic responses of the first hybrid populations under the highland environmental conditions at 3350 masl has showed a high frequency of cold tolerant hybrid lines and genotypes with one-two month reduction of the growing period for dry kernels.

Palabras clave : maize; Zea mays; earliness; cold tolerance; landraces; geneflow.

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