A method for studying resistance to drought injury in inbred lines of maize

Hunter, J.W.; Laude, H.H.; Bunson, A.M.

A method for studying resistance to drought injury in inbred lines of maize

1936

Hunter, J.W. | Laude, H.H. | Bunson, A.M.

By testing 14-day-old seedlings for 6.5 hours in a chamber with temperature controlled at 140 degrees F and with a relative humidity of about 30%, it was possible to distinguish among strains with respect to drought tolerance. Essentially the same order of relative resistance was obtained with the seedlings as was noted for the plants in the field. The lines susceptible to top-firing under field conditions showed marked injury in the testing chamber in 3 to 5 hours, those susceptible to base-firing showed injury in 4 to 6 hours, and the resistant lines showed little or no injury after 6.5 hours. When returned to good growing conditions following the exposure to high temperature, the survival of plants was o% in the lines susceptible to base-firing, 0 to 25% in those susceptible to top-firing, and 50 to 100% in the resistant lines.

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