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Ethylene production by two genotypes of sorghum varying in drought resistance


Cereal Research Communications 19(3): 357-360
Ethylene production by two genotypes of sorghum varying in drought resistance
Ethylene production by drought-resistant and drought-sensitive genotypes of sorghum [Sorghum bicolor (L.) Moench] was measured under drought stress to determine if they varied in ethylene production. Plants were grown in sand in a greenhouse. When they were 19 days old, they were watered with tap water (control) or with three different concentrations of polyethylene glycol (PEG) (mol. wt. 8000) : -0.5, -1.0, or -1.5 MPa. One day later, ethylene evolution was analyzed. The drought-resistant genotype ('IA 28') produced more ethylene than the drought-sensitive one ('Redlan'), when the plants were watered with tap water or with the -0.5 and -1.0 MPa PEG solutions. Ethylene emission by IA 28 was not related to the level of stress. It produced a high amount of ethylene (between 30 and 60 nL per gram dry weight) under all four treatments. In contrast, the amount of ethylene emitted by Redlan increased as the level of stress increased. Thus, at the highest level of stress (-1.5 MPa), it evolved more ethylene than IA 28. The results showed that whether or not a drought-resistant genotype produces more ethylene than a drought-sensitive one depends upon the level of drought stress.


Accession: 002373778



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