Estudios sobre la vernalización del maíz
[EN] There are some maize varieties of good yield which cannot be grown in the upper lands of Galicia, because their vegetative cycle is too long. Normally they become injured by frost before they are fully ripe. If their vegetative cycle could be shortened by 15-20 days, it would be possible to gro...
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| Formato: | artículo |
| Fecha de publicación: | 1953 |
| País: | España |
| Recursos: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/61198 |
| Acesso em linha: | http://hdl.handle.net/10261/61198 |
| Access Level: | acceso abierto |
| Palavra-chave: | Zea mays L. Vernalization Vernalización Galicia |
| Resumo: | [EN] There are some maize varieties of good yield which cannot be grown in the upper lands of Galicia, because their vegetative cycle is too long. Normally they become injured by frost before they are fully ripe. If their vegetative cycle could be shortened by 15-20 days, it would be possible to grow them in these lands. In order to do this, we have set up some experiments on vernalization with the following four different types of maize: a late yellow variety from a three ways cross; (86x39)x76; a late white variety 222; a late white variety from a single cross 35x38, and an early yellow pure line (S8). All four types of maize were vernalizated for 4, 3, 2 and 1 week at 0°C, alone or in combination with 10 and 100 ppm of B-indolylacetic acid applied at the beginig of vernalization. Before vernalization, seeds were sterilized in a 1% chlorine solution for 4 hours and rinsed twice with boiled distilled water. After this treatment, they were allowed to imbibe up to 55% of their absolute dry weight. They were then put into dishes and allowed to germinate at 20ºC for 24 hours. The dishes were then transferred to a refrigerator at 0ºC. In order to keep the weight constant, the dishes were weighed twice a week and when necessary sterile water was dropped through the tube to bring the weight to the 50% level. 40-50 seeds of maize were used for each treatment. The following measurements were made for each plant: 1) Number of leaves from soil level to the silk and from silk to tassle; 2) height at time of tassling; 3) number of tillers; 4) height at maturity of cob; 5) weight of cobs and 6) number of days to appearance of mature silks and tassles. No significant differences were found between the means of vernalized and not treated plants. As there is no measurable response to the treatments, it may be concluded that the method has not economical application. |
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