resistência à seca em quatro cultivares de trigo: parâmetros fisiológicos drought resistance in wheat cultivars: physiological parameters
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ID: 173805
1995
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Abstract
A resistência à seca foi estudada em quatro cultivares de trigo, dois de porte baixo: Anahuac e IAC-24 e dois de porte alto, BH-1146 e IAC-23, em dois tratamentos de irrigação: I- vasos constantemente molhados por capilaridade; II- vasos irrigados quando o potencial de água do solo atingisse, aproximadamente, -1,5 MPa. O potencial de água e o teor relativo de água das folhas foram mais elevados no tratamento precondicionado ao estresse, em relação ao irrigado por capilaridade, em todos os cultivares sob as mesmas condições de umidade do solo em ambos os estádios considerados: desenvolvimento vegetativo e reprodutivo. Embora os estômatos das plantas do tratamento submetido ao estresse permanecessem abertos a potenciais de água mais negativos que naqueles em que as plantas recebiam água constantemente, não foi possível separar genótipos mais ou menos resistentes à seca, utilizando-se a difusividade ao vapor d'água dos estômatos acoplada ao teor relativo de água e ao potencial de água das folhas.
The drought resistance was studied for four wheat cultivars: two dwarfs: Anahuac and IAC-24 and two tall ones: BH-1146 and IAC-23, using a treatment I constantly wetted by cailarity, and other one, II, which received water when soil water potential reached -1,5 MPa. Leaf water potential and relative water content were higher in treatment II than in treatment I, at the same soil water potentials for all cultivars, in the two development stages (vegetative, and reprodutive). There was no way of separating genotypes more or less resistant to drought, only using the relations between leaf water potential and leaf diffusive resistance to water vapour.
The drought resistance was studied for four wheat cultivars: two dwarfs: Anahuac and IAC-24 and two tall ones: BH-1146 and IAC-23, using a treatment I constantly wetted by cailarity, and other one, II, which received water when soil water potential reached -1,5 MPa. Leaf water potential and relative water content were higher in treatment II than in treatment I, at the same soil water potentials for all cultivars, in the two development stages (vegetative, and reprodutive). There was no way of separating genotypes more or less resistant to drought, only using the relations between leaf water potential and leaf diffusive resistance to water vapour.
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denadai1995scientiaresistncia
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| Authors | ;I.A.M. Denadai;A.E. Klar |
| Journal | journal of the iranian chemical society |
| Year | 1995 |
| DOI |
10.1590/S0103-90161995000200012
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