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| Web URL(s): | https://academic.oup.com/aob/article/63/4/477/134653/
Last checked: 02/27/2017
Requires: PDF Reader |
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| Publication Type:
| Refereed |
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| Author(s): | Busso, C. A.;
Mueller, R. J.;
Richards, J. H. |
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| Author Affiliation: | Dept. of Range Science and the Ecology Center, Dept. of Biology, Utah State University, Logan, UT |
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| Title: | Effects of Drought and Defoliation on Bud Viability in Two Caespitose Grasses |
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| Source: | Annals of Botany. Vol. 63, No. 4, April 1989, p. 477-485. |
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| Publishing Information: | London, Oxford University Press |
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| Keywords: | TIC Keywords: Regrowth; Drought; Agropyron desertorum; Pseudoroegneria spicata; Defoliation; Viability; Irrigation rates
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| Abstract/Contents: | "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 droughted, 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, tiller number and growth in both species were reduced in the following spring under all water regimes. This reduction was present 1 year earlier in the drought treatment than in the treatments with higher water availability. Permanent dormancy or death of the replacement axillary meristems can explain this plant response. Continued defoliation of the tillers under drought would reduce the photosynthetic area further, and probably affect the persistence of these species in the community." |
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| Language: | English |
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| References: | 46 |
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| Note: | Figures |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Busso, C. A., R. J. Mueller, and J. H. Richards. 1989. Effects of Drought and Defoliation on Bud Viability in Two Caespitose Grasses. Ann. Bot. 63(4):p. 477-485. |
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| Web URL(s):
https://academic.oup.com/aob/article/63/4/477/134653/
Last checked: 02/27/2017
Requires: PDF Reader |
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MSU catalog number: QK 1 .A53 |
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