Physiological Responses of Selected Taxa of Salvia, Taxus, Cephalotaxus, and Syringa to Heat and/or Flooding

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dc.contributor.advisor Thomas G. Ranney, Committee Member en_US
dc.contributor.advisor Frank A. Blazich, Committee Co-Chair en_US
dc.contributor.advisor Stuart L. Warren, Committee Co-Chair en_US
dc.contributor.advisor Udo Blum, Committee Member en_US Lasseigne, Francis Todd en_US 2010-04-02T19:03:45Z 2010-04-02T19:03:45Z 2004-05-31 en_US
dc.identifier.other etd-03022004-100410 en_US
dc.description.abstract High-temperature stress impacts plant growth in warm-temperate climates. Landscape plants are subjected to extreme conditions in urban environments, due to reflected light and retained heat from brick and concrete. Two experiments were conducted to ascertain heat tolerance across a range of Salvia L. taxa. In the first study, Salvia chamaedryoides Cav., S. greggii A. Gray 'Furman's Red', S. guaranitica St.-Hil. ex Benth., S. leucantha Cav., S. nemorosa L. 'Ostfriesland', S. pratensis L., S. splendens Sell. ex Roem. & Schult., and S. x sylvestris L. 'Mainacht' were grown under 15-hour days of 20, 25, 30, 35, or 40 °C and 9-hour nights of 15 or 25 °C. American taxa performed poorly — S. chamaedryoides, S. greggii 'Furman's Red', S. guaranitica, S. leucantha, and S. splendens — exhibiting chlorosis and growth distortions at 35 and 40 °C. European taxa, S. nemorosa 'Ostfriesland', S. pratensis, S. x sylvestris 'Mainacht', maintained shoot and root dry weights at 35 and 40 °C and exhibited lesser physical symptoms. The second study demonstrated that S. x sylvestris 'Mainacht' and S. nemorosa 'Pusztaflamme' were better able to maintain net photosynthetic rates (P[subscript n]) at 35 and 40 °C than S. guaranitica and S. leucantha. In regions with hot, humid climates, plant growth is limited by tolerance of root systems to hot, wet conditions in poorly drained soils. A third study measured flood and heat tolerance of Taxus canadensis Marsh., T. x media Rehd. 'Brownii', T. x media 'Densiformis', T. x media 'Tauntonii', T. wallichiana Zucc. var. chinensis (Pilg.) Florin, and Cephalotaxus harringtonia (Knight ex Forbes) K. Koch 'Prostrata'. Despite anecdotal evidence that Taxus are intolerant of heat and poor soil drainage, cultivars of T. x media, especially 'Densiformis', survived a 30-day flood and grew better than other taxa at 30/26 °C. In a fourth study, Syringa x hyacinthiflora (Lemoine) Rehd. 'California Rose', S. x persica L., and S. vulgaris L. were subjected to flooding at 16-hour days/8-hour nights of 25/20, 30/25, or 35/30 °C. No plants survived a 10-day flood. Both S. x persica and S. x hyacinthiflora 'California Rose' exhibited greater growth and higher P[subscript n] rates at day temperatures up to 35 °C, compared to S. vulgaris. en_US
dc.rights I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to NC State University or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. en_US
dc.subject flooding tolerance en_US
dc.subject heat stress en_US
dc.subject ornamental landscape plants en_US
dc.title Physiological Responses of Selected Taxa of Salvia, Taxus, Cephalotaxus, and Syringa to Heat and/or Flooding en_US PhD en_US dissertation en_US Horticultural Science en_US

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