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| Publication Type:
| Refereed |
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| Author(s): | Karnok, Keith J.;
Beard, James B. |
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| Author Affiliation: | Karnok: Graduate Research Assistant; Beard: Professor, Department of Soil and Crop Sciences, Texas A&M University, College Station, TX |
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| Title: | Morphological responses of Cynodon and Stenotaphrum to chilling temperatures as affected by gibberellic acid |
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| Section: | Reports & notes
Other records with the "Reports & notes" Section
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| Source: | HortScience. Vol. 18, No. 1, February 1983, p. 95-97. |
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| # of Pages: | 3 |
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| Keywords: | TIC Keywords: Cynodon dactylon; Stenotaphrum secundatum; Cold resistance; Winter dormancy; Winter color; Temperatures; Growth regulators; Discoloration; Gibberellins; Leaves; Gibberellic acid
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| Cultivar Names: | Pee Dee; Ormond; Floratam; Texas common |
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| Abstract/Contents: | "The morphological progression of low-temperature discoloration as affected by gibberellic acid (GA3) applied exogenously was determined for 'Ormond' (chill-tolerant) and 'Pee Dee' (chill-sensitive) bermudagrass [Cynodon dactylon (L.) Pers.] and 'Floratam' (chill-tolerant) and 'Texas Common' (chill-sensitive) St. Augustinegrass [Stenotaphrum secundatum (Walt) Kuntze] while exposed to chilling temperatures of 7°C (day)/5° (night) for 14 days. Visible symptoms on all cultivars occurred first and progressed most rapidly on horizontal leaf blades and stems which were directly exposed to light. Leaf blades and stems deep in the canopy or shaded by other plant parts were the last to show injury. Bleaching and/or the formation of a purple pigmentation occurred in the leaf blades and stems of both bermudagrass cultivars within 3 days of chilling stress. The symptoms occurred first and proceeded more rapidly on 'Pee Dee'. Both St. Augustinegrass cultivars showed visual symptoms after 5 or more days of chilling stress. Wilting was followed immediately by the development of water-soaked lesions and finally by total necrosis. The application of GA3 at 62.5 g ha-1 stimulated shoot growth of both chill-stressed bermudagrass cultivars and almost completely prevented development of a purple pigmentation in the leaf blades and stems. GA3 did not stimulate shoot growth, and it increased the rapidity and severity of the chilling injury symptom on the blades and stems of both St. Augustinegrass cultivars, indicating a possible toxicity effect at the rate used." |
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| Language: | English |
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| References: | 14 |
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| See Also: | Other items relating to: PGRS |
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| Note: | Tables |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Karnok, K. J., and J. B. Beard. 1983. Morphological responses of Cynodon and Stenotaphrum to chilling temperatures as affected by gibberellic acid. HortScience. 18(1):p. 95-97. |
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