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The effects of solar ultraviolet-B o...

Xu, Chenping.

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The effects of solar ultraviolet-B on the proteome and antioxidant defense systems in soybean leaves.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	The effects of solar ultraviolet-B on the proteome and antioxidant defense systems in soybean leaves./
作者:	Xu, Chenping.
面頁冊數:	168 p.
附註:	Adviser: Joe H. Sullivan.
Contained By:	Dissertation Abstracts International68-04B.
標題:	Biology, Plant Physiology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3260339

The effects of solar ultraviolet-B on the proteome and antioxidant defense systems in soybean leaves.
Xu, Chenping.

The effects of solar ultraviolet-B on the proteome and antioxidant defense systems in soybean leaves. - 168 p.

Adviser: Joe H. Sullivan.

Thesis (Ph.D.)--University of Maryland, College Park, 2007.

Stratospheric ozone depletion has caused an increase in the amount of ultraviolet-B (UV-B) radiation reaching the earth's surface. Some investigations have demonstrated that UV-B has effects on protein accumulation and active oxygen species (AOS) metabolism in plants. Because of the unrealistically high UV-B level and low levels of ultraviolet-A (UV-A) and photosythetically active radiation (PAR) in indoor studies it has been questioned whether results from these studies can be extrapolated to field responses. In the present study two isolines of the soybean cultivar Clark with different flavonoid contents were grown in the field with or without natural levels of UV-B. The leaf proteome and AOS metabolism were examined.Subjects--Topical Terms:

1017865
Biology, Plant Physiology.

The effects of solar ultraviolet-B on the proteome and antioxidant defense systems in soybean leaves.
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035 $a (UMI)AAI3260339
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100 1 $a Xu, Chenping. $3 1291649
245 1 4 $a The effects of solar ultraviolet-B on the proteome and antioxidant defense systems in soybean leaves.
300 $a 168 p.
500 $a Adviser: Joe H. Sullivan.
500 $a Source: Dissertation Abstracts International, Volume: 68-04, Section: B, page: 2147.
502 $a Thesis (Ph.D.)--University of Maryland, College Park, 2007.
520 $a Stratospheric ozone depletion has caused an increase in the amount of ultraviolet-B (UV-B) radiation reaching the earth's surface. Some investigations have demonstrated that UV-B has effects on protein accumulation and active oxygen species (AOS) metabolism in plants. Because of the unrealistically high UV-B level and low levels of ultraviolet-A (UV-A) and photosythetically active radiation (PAR) in indoor studies it has been questioned whether results from these studies can be extrapolated to field responses. In the present study two isolines of the soybean cultivar Clark with different flavonoid contents were grown in the field with or without natural levels of UV-B. The leaf proteome and AOS metabolism were examined.
520 $a Ambient solar UV-B radiation changed AOS metabolism by decreasing superoxide dismutase activity and increasing the activities of ascorbate peroxidase, catalase and glutathione reductase relative to UV-B exclusion treatments. This resulted in decreased ascorbic acid and increased dehydroascorbate content. Proteomic analysis showed that the accumulations of 67 protein spots were significantly affected by solar UV-B. Proteins related to photosystems in photosynthesis were increased in abundance while enzymes involved in the primary carbon and nitrogen metabolism were decreased. This could lead to overreduction of the photosynthetic electron transport chain and enhance the formation of superoxide radicals and singlet oxygen. The magenta line, which has reduced flavonoid levels, had greater proteomic and oxidative responses than the standard line, suggesting that flavonoids act as screening compounds and antioxidants in protecting plants from UV-B radiation. These line-specific differences occurred even under UV-B exclusion, which may be due to high UV-A, PAR or temperature. More detailed studies are needed to elucidate the effects of other environmental factors on the soybean leaf proteome and AOS metabolism under field conditions.
590 $a School code: 0117.
650 4 $a Biology, Plant Physiology. $3 1017865
690 $a 0817
710 2 0 $a University of Maryland, College Park. $b Natural Resource Sciences. $3 1030344
773 0 $t Dissertation Abstracts International $g 68-04B.
790 $a 0117
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791 $a Ph.D.
792 $a 2007
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