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Horticultural potential and populati...

Boyer, Nickolee Zollinger.

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Horticultural potential and population genetics of Nyssa aquatica L. (water tupelo).

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Horticultural potential and population genetics of Nyssa aquatica L. (water tupelo)./
作者:	Boyer, Nickolee Zollinger.
面頁冊數:	140 p.
附註:	Source: Dissertation Abstracts International, Volume: 71-01, Section: B, page: 0012.
Contained By:	Dissertation Abstracts International71-01B.
標題:	Agriculture, Horticulture. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3389088
ISBN:	9781109552294

Horticultural potential and population genetics of Nyssa aquatica L. (water tupelo).
Boyer, Nickolee Zollinger.

Horticultural potential and population genetics of Nyssa aquatica L. (water tupelo). - 140 p.

Source: Dissertation Abstracts International, Volume: 71-01, Section: B, page: 0012.

Thesis (Ph.D.)--Iowa State University, 2009.

Trees native to seasonally flooded wetlands have proven valuable in managed landscapes where wide fluctuations in soil moisture occur regularly. Nyssa aquatica L. (water tupelo) is a large, deciduous tree native to continuously and periodically flooded wetlands of the southeastern United States. I investigated the potential for using this tree in horticulture based on its tolerance to extreme fluctuations in soil moisture, water deficit, and its capability to be propagated asexually via stem cuttings. I also examined the genetic structure of the species across its native range by using inter-simple sequence repeats (ISSRs). Seedlings of N. aquatica were more tolerant to water deficit than seedlings of Nyssa ogeche Bartram ex. Marsh. (Ogeechee tupelo), another native North American species indigenous to wetland soils. Up to 40% mortality was observed for N. ogeche when subjected to repeated cycles of soil drying, whereas a maximum of 20% mortality was observed for N. aquatica subjected to the same treatment. However, up to 55% of N. aquatica plants died when subjected to continuous water deficit. Seedlings of N. aquatica were tolerant to wide fluctuations in soil moisture but were sensitive to long-term water deficit when growth potential was high during spring and early summer. Plants exposed to moderate soil moisture before water deficit exhibited reduced photosynthetic rates and predawn water potentials, whereas plants subjected to a water deficit pretreatment or flooding before water deficit had photosynthetic rates and predawn water potentials similar to those of well-watered controls. Seedlings treated with flooding before being exposed to water deficit also maintained greater aesthetic appeal than those pretreated with moderate soil moisture. Slower growth rates and reduced leaf area resulted when plants were treated with water deficit or flooding, which led to reduced transpirational demand and probably contributed to increased tolerance to future water deficit compared with plants pretreated with moderate soil moisture. Softwood cuttings of juvenile stems rooted at high frequency (up to 93% success). Rooting was best among cuttings from terminal positions on stock plants treated with a solution containing 1-naphthalenacetic acid (NAA). Genetic analyses of 24 populations of N. aquatica revealed moderate differentiation among populations and minimal regional structure. I conclude that N. aquatica has potential for use in urban landscapes prone to wide fluctuations in soil moisture, provided that episodes of water deficit are not severe or extended. Propagation of clonal selections of juvenile trees is possible by using stem cuttings. Minimal regional genetic structure suggests that clonal selections from any part of the range could be marketed without concerns about influencing the genetic structure of any particular region.

ISBN: 9781109552294Subjects--Topical Terms:

1017832
Agriculture, Horticulture.

Horticultural potential and population genetics of Nyssa aquatica L. (water tupelo).
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500 $a Adviser: William R. Graves.
502 $a Thesis (Ph.D.)--Iowa State University, 2009.
520 $a Trees native to seasonally flooded wetlands have proven valuable in managed landscapes where wide fluctuations in soil moisture occur regularly. Nyssa aquatica L. (water tupelo) is a large, deciduous tree native to continuously and periodically flooded wetlands of the southeastern United States. I investigated the potential for using this tree in horticulture based on its tolerance to extreme fluctuations in soil moisture, water deficit, and its capability to be propagated asexually via stem cuttings. I also examined the genetic structure of the species across its native range by using inter-simple sequence repeats (ISSRs). Seedlings of N. aquatica were more tolerant to water deficit than seedlings of Nyssa ogeche Bartram ex. Marsh. (Ogeechee tupelo), another native North American species indigenous to wetland soils. Up to 40% mortality was observed for N. ogeche when subjected to repeated cycles of soil drying, whereas a maximum of 20% mortality was observed for N. aquatica subjected to the same treatment. However, up to 55% of N. aquatica plants died when subjected to continuous water deficit. Seedlings of N. aquatica were tolerant to wide fluctuations in soil moisture but were sensitive to long-term water deficit when growth potential was high during spring and early summer. Plants exposed to moderate soil moisture before water deficit exhibited reduced photosynthetic rates and predawn water potentials, whereas plants subjected to a water deficit pretreatment or flooding before water deficit had photosynthetic rates and predawn water potentials similar to those of well-watered controls. Seedlings treated with flooding before being exposed to water deficit also maintained greater aesthetic appeal than those pretreated with moderate soil moisture. Slower growth rates and reduced leaf area resulted when plants were treated with water deficit or flooding, which led to reduced transpirational demand and probably contributed to increased tolerance to future water deficit compared with plants pretreated with moderate soil moisture. Softwood cuttings of juvenile stems rooted at high frequency (up to 93% success). Rooting was best among cuttings from terminal positions on stock plants treated with a solution containing 1-naphthalenacetic acid (NAA). Genetic analyses of 24 populations of N. aquatica revealed moderate differentiation among populations and minimal regional structure. I conclude that N. aquatica has potential for use in urban landscapes prone to wide fluctuations in soil moisture, provided that episodes of water deficit are not severe or extended. Propagation of clonal selections of juvenile trees is possible by using stem cuttings. Minimal regional genetic structure suggests that clonal selections from any part of the range could be marketed without concerns about influencing the genetic structure of any particular region.
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790 1 0 $a Graves, William R., $e advisor
790 1 0 $a Nason, John $e committee member
790 1 0 $a Dixon, Philip $e committee member
790 1 0 $a Iles, Jeffery $e committee member
790 1 0 $a Lashbrook, Coralie $e committee member
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