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The role of phytohormones in the sha...

Kurepin, Leonid V.

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The role of phytohormones in the shade avoidance syndrome.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	The role of phytohormones in the shade avoidance syndrome./
作者:	Kurepin, Leonid V.
面頁冊數:	155 p.
附註:	Source: Dissertation Abstracts International, Volume: 66-06, Section: B, page: 2998.
Contained By:	Dissertation Abstracts International66-06B.
標題:	Biology, Plant Physiology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=NR03872
ISBN:	9780494038727

The role of phytohormones in the shade avoidance syndrome.
Kurepin, Leonid V.

The role of phytohormones in the shade avoidance syndrome. - 155 p.

Source: Dissertation Abstracts International, Volume: 66-06, Section: B, page: 2998.

Thesis (Ph.D.)--University of Calgary (Canada), 2005.

Most plant species grown under a leaf canopy or among taller neighbouring plants will have elongated internodes (stems) and reduced leaf area, i.e. they have a Shade Avoidance Syndrome (SAS). Habitats characterized by the SAS receive both reduced light quality and reduced light irradiance the main object of this work was to uncouple light quality (Red/Far Red [R/FR] ratio) from light irradiance and test the hypothesis that each component may differentially regulate plant etiolation and de-etiolation responses by modifying levels of endogenous phytohormones, e.g. gibberellins (GAs), auxin (IAA), abscisic acid (ABA) and ethylene.

ISBN: 9780494038727Subjects--Topical Terms:

1017865
Biology, Plant Physiology.

The role of phytohormones in the shade avoidance syndrome.
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500 $a Source: Dissertation Abstracts International, Volume: 66-06, Section: B, page: 2998.
502 $a Thesis (Ph.D.)--University of Calgary (Canada), 2005.
520 $a Most plant species grown under a leaf canopy or among taller neighbouring plants will have elongated internodes (stems) and reduced leaf area, i.e. they have a Shade Avoidance Syndrome (SAS). Habitats characterized by the SAS receive both reduced light quality and reduced light irradiance the main object of this work was to uncouple light quality (Red/Far Red [R/FR] ratio) from light irradiance and test the hypothesis that each component may differentially regulate plant etiolation and de-etiolation responses by modifying levels of endogenous phytohormones, e.g. gibberellins (GAs), auxin (IAA), abscisic acid (ABA) and ethylene.
520 $a I used two model plant systems. One is the sunflower hypocotyl, an organ which etiolates when the seedling is grown either in reduced irradiance or in enriched FR. Reduced irradiance (under a low R/FR ratio) had no significant effect on endogenous GA or IAA levels. However, under either low or especially under normal irradiance, as I increase the R/FR ratio, de-etiolation of the hypocotyl occurred and associated with it were reduced levels of GA1 and GA20, and increased levels of GA53. While these results give no simple answer for the etiolation seen under the SAS, they do imply that enrichment with R light, especially under higher irradiance, reduces metabolism of the C20 GA, GA53 and may also reduce 3beta-OH of GA20, to GA1, thereby inhibiting hypocotyl elongation.
520 $a The second model system was Stellaria longipes, where one genotype originates from an open alpine habitat (dwarf phenotype). The other genotype, which has a very plastic response to light, comes from a low elevation prairie habitat. The prairie genotype showed very increased stem elongation in response to both enriched FR and reduced irradiance, i.e. it exhibited the SAS. In contrast, the alpine genotype showed increased stem elongation in response to reduced light irradiance, but not to enriched FR. The alpine genotype's increased elongation under reduced irradiance was associated with increased levels of endogenous GA1, GA8, GA 20 and IAA. However, the increased stem elongation of the "shade" prairie genotype in response to reduced irradiance was associated only with increased levels of all endogenous GAs, i.e. GA1, GA8, GA19, GA20 and GA53.
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