Tolerancia a presion osmotica y a marchitez permanente en maiz (Zea mays L.) y sorgo (Sorghum bicolor Moench).
1988
Rincon Tuexi J.A. | Munoz Orozco A. | Mendoza Onofre L.E.
In 11 sorghum genotypes and two corn synthetic varieties, some of them previously classified as drought resistant, osmotic tolerance of germination in 0, 5, 10 and 15 atm solution and seedling permanent wilting tolerance were studied. Although variation for osmotic pressure tolerance was found within genotypes, sorghum showed a higher tolerance than corn. The sorghum germination at 5 and 10 atm was more associated to plumule than to the radicle growth. Even through one of the two corn synthetic varieties, the S, was previously catalogued as drought resistant, no difference was detected in osmotic pressure tolerance between them. Both corn varieties showed higher permanent wilting (PW) tolerance than the sorghum cultivars althought differences were detected among these. The synthetic corn variety classified as drought resistant recovered its turgidity faster (after nine days under PW) than the drought susceptible one. In sorghum, no relationship between osmotic pressure tolerance and indicative variables for PW tolerance was detected.
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