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Axillary bud number, bud respiratory activity, and photosynthetic canopy re-establishment after defoliation were determined for two bunchgrass species, Agropyron desertorum and Agropyron spicatum, which were exposed to draughted, natural or irrigated conditions. These field treatments were repeated annually on the same plants for the period 1984–1986. Bud respiratory activity was examined using the tetrazolium test, which was validated with the vital stain Evan's blue, at the end of the study

In spring of the third year, the number of axillary buds on tillers of both species was lowest in the drought treatment. Most of these buds, and those observed immediately after defoliation in 1985, were metabolically active. These results indicate that after mid-season defoliation under drought, when no re-growth occurred, the re-growth capacity was not limited by bud number or viability. After 3 years of defoliation …