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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Cummings, H. D.;
Yelverton, F. H.;
Hinton, J. D. |
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| Author Affiliation: | Crop Science Department, North Carolina State University, Raleigh, North Carolina |
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| Title: | Use of gibberellic acid to reverse the effects of gibberellic acid inhibiting plant growth regulators |
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| Section: | Weed management in turf, pasture, and rangeland
Other records with the "Weed management in turf, pasture, and rangeland" Section
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| Meeting Info.: | 55th Annual Meeting, Atlanta, GA: January 28-30, 2002 |
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| Source: | Southern Weed Science Society Proceedings. Vol. 55, 2002, p. 70. |
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| Publishing Information: | Champaign, IL: Southern Weed Science Society. |
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| # of Pages: | 1 |
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| Abstract/Contents: | "Gibberellic acid (GA) inhibiting plant growth regulators (PGRs) like trinexapac-ethyl (TE) and paclobutrazol (PZL) may be applied in spring and fall to creeping bentgrass for growth management or to control Poa annua, respectively. GA1 is a growth hormone that promotes cell elongation. It is not known if the effects of GA-inhibiting PGRs can be reversed by applying GA3. The objectives of this experiment were to determine the relative effects of adding GA3 to bentgrass treated and not treated with GA-inhibiting PGRs and to determine if an over application of a GA-inhibiting PGR could be reversed. Experiments were conducted on established 'Penncross' creeping bentgrass (Agrostis stolonifera L.) maintained at 4 mm at the Raleigh Field laboratory in NC. Experiments were conducted using a RCB design with a 3 X 5 factorial arrangement (TE, PZL, and nontreated X five rates of GA3). Trinexapac-ethyl was applied at 1 kg ai/ha (20X rate), and paclobutrazol was applied at 0.6 kg ai/ha (2X rate). Unlike TE, PZL blocks all GA synthesis in plants; thus a 20X rate of PZL would have been too injurious. GA3 was applied 2 days later to plots treated and not treated with PGRs at 0, 0.4, 0.8, 1.5, and 3.0 kg ai/ha. Plots were mowed twice weekly, and clippings were collected during the second mowing for six weeks. Clippings were oven dried for two weeks and dry weight recorded. Visual quality ratings were taken weekly using a scale of 1 to 9 where 1=dead, 5=marginally acceptable, 7=average, and 9=perfect. The GA3 without PGR treatments reported significant increases in clippings compared to nontreated for the first three weeks at all rates applied. The low rate and high rate of GA3 increased clipping dry weight 200 and 300 %, respectively 1 week after treatment (WAT). By 3 WAT, only GA3 at 3 kg ai/ha produced clipping weights significantly greater than the nontreated. Similarly, the TE or PZL followed by GA3 treatments reported significant increases in clipping dry weight when compared to the nontreated for the first three weeks. Therefore, these data demonstrated that an exogenous application of GA3 was able to counteract the growth regulation of GA-inhibiting PGRs. All GA3 treatments reported significantly lower visual quality ratings than the nontreated for all six weeks. Quality decreased significantly with increasing rates of GA3. Quality ratings were lowest 2 WAT through 5 WAT. However, quality ratings for GA3, at 0.4 kg ai/ha were above 5 for all six weeks; 5 was the cut off for minimally acceptable quality; thus the except for the low rate for GA3, the TE or PZL followed by GA3 treatments were significantly lower than the nontreated. Quality ratings from either PGR treatments without GA3 were not different from the nontreated." |
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| Language: | English |
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| References: | 0 |
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| See Also: | Other items relating to: P G Rs 1997-2006 |
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| Note: | This item is an abstract only! |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Cummings, H. D., F. H. Yelverton, and J. D. Hinton. 2002. Use of gibberellic acid to reverse the effects of gibberellic acid inhibiting plant growth regulators. South. Weed Sci. Soc. Proc. 55:p. 70. |
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