Relations between the potential and temperature of the corn and sorghum leafs submitted water stress - DOI: 10.4025/actasciagron.v29i4.426

• Autor(a) principal: Júnior, Pedro Abel Vieira
• Data de Publicação: 2008
• Outros Autores: Neto, Durval Dourado, Oliveira, Ricardo Ferraz de, Peres, Lázaro Eustáquio Pereira, Martin, Thomas Newton, Manfron, Paulo Augusto, Bonnecarrère, Reinaldo Antônio Garcia
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Acta Scientiarum. Agronomy (Online)
• Texto Completo: http://www.periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/426
• topic: água; anisohídrico; isohídrico; Zea mays L.; Sorghum bicolor L.

To evaluate the daily behavior of the water potential in corn and of sorghum plants submitted to water stress, relating with the leaf and ambient temperature, were cultivated, in individual pots in greenhouse, five plants of each species. The plants were kept at field capacity until they reached the stage of four leaves. Between that stadium and close to the wilting point the irrigation was suspended and were monitored daily the ambient temperature (Tam), the water potential in the leaf (Ψ folha) and the temperature on the leaf sheet (Tfoext). The plants whose leaves rolled up had their internal temperature measured (Tfoint). The average time of Ψ folha was calculated for both species relating them with Tfoex, Tfoint and the differences among those temperatures. Both species presented behaviors similar to Ψ folha and between 1pm to 3pm they showed the lowest Ψ folha. Despite the significant inverse relationship between Tfoext and Ψ folha, in corn, this relationship does not present enough precision to use the measure os Tfoex in the control of the water status of the plant and the Tfoint was inferior to the Tfoex, becoming a protection mechanism which allows the plant to maintain its metabolism.