Produção Nacional
Revisado por pares
Relações entre o potencial e a temperatura da folha de plantas de milho e sorgo submetidas a estresse hídrico
2007; Editora da Universidade Estadual de Maringá (Eduem); Volume: 29; Issue: 4 Linguagem: Inglês
10.4025/actasciagron.v29i4.426
ISSN1807-8621
AutoresDurval Dourado Neto, Pedro Abel Vieira Júnior, Ricardo Ferraz de Oliveira, Lázaro Eustáquio Pereira Peres, Thomas Newton Martin, Paulo Augusto Manfron, Reinaldo Antônio Garcia Bonnecarrère,
Tópico(s)Plant Water Relations and Carbon Dynamics
ResumoTo 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.
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