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Analysis of transformed alfalfa over...

Higbie, Sarah Manion.

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Analysis of transformed alfalfa overexpressing the genes for manganese superoxide dismutase or ascorbate peroxidase.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Analysis of transformed alfalfa overexpressing the genes for manganese superoxide dismutase or ascorbate peroxidase./
作者:	Higbie, Sarah Manion.
面頁冊數:	280 p.
附註:	Chair: Champa Sengupta-Gopalan.
Contained By:	Dissertation Abstracts International63-11B.
標題:	Agriculture, Agronomy. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3072021
ISBN:	0493918094

Analysis of transformed alfalfa overexpressing the genes for manganese superoxide dismutase or ascorbate peroxidase.
Higbie, Sarah Manion.

Analysis of transformed alfalfa overexpressing the genes for manganese superoxide dismutase or ascorbate peroxidase. - 280 p.

Chair: Champa Sengupta-Gopalan.

Thesis (Ph.D.)--New Mexico State University, 2002.

Reactive oxygen species (ROS) are byproducts of metabolism. However, environmental stresses, like drought, cause increased ROS production. This triggers oxidative stress and leads to oxidative damage resulting in cellular components including lipid membranes, nucleic acids and key proteins being damaged or destroyed. Higher plants have developed the ascorbate-glutathione pathway to aid in the deactivation of cellular ROS. This pathway involves the enzymes ascorbate peroxidase (APX), superoxide dismutase (SOD) and glutathione reductase (GR) and is induced when ROS production exceeds the scavenging capabilities of the pathway.

ISBN: 0493918094Subjects--Topical Terms:

1018679
Agriculture, Agronomy.

Analysis of transformed alfalfa overexpressing the genes for manganese superoxide dismutase or ascorbate peroxidase.
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100 1 $a Higbie, Sarah Manion. $3 1256819
245 1 0 $a Analysis of transformed alfalfa overexpressing the genes for manganese superoxide dismutase or ascorbate peroxidase.
300 $a 280 p.
500 $a Chair: Champa Sengupta-Gopalan.
500 $a Source: Dissertation Abstracts International, Volume: 63-11, Section: B, page: 5064.
502 $a Thesis (Ph.D.)--New Mexico State University, 2002.
520 $a Reactive oxygen species (ROS) are byproducts of metabolism. However, environmental stresses, like drought, cause increased ROS production. This triggers oxidative stress and leads to oxidative damage resulting in cellular components including lipid membranes, nucleic acids and key proteins being damaged or destroyed. Higher plants have developed the ascorbate-glutathione pathway to aid in the deactivation of cellular ROS. This pathway involves the enzymes ascorbate peroxidase (APX), superoxide dismutase (SOD) and glutathione reductase (GR) and is induced when ROS production exceeds the scavenging capabilities of the pathway.
520 $a Alfalfa (<italic>Medicago sativa</italic> cv. Malone) was analyzed to determine cellular response during drought. The protein level or enzyme activity of APX, MnSOD and GR were found to be higher in droughted alfalfa. Transcripts of genes encoding key enzymes in the leaves [glutamine synthetase (GS 2)] and nodules [leghemoglobin (Lb), nitrogenase (<italic>nif</italic>H), glutamine synthetase (GS1)] decreased in droughted alfalfa, while the transcript level of ferritin, a gene induced by drought, was found to increase. In addition, the level of lipid peroxidation (measuring thiobarbituric acid reactive substances or TBARS) was higher in droughted alfalfa compared to control. This suggests that even though the activity level of enzymes associated with ROS scavenging increases, the increase is not sufficient to protect cellular components like lipid membranes and nucleic acids from oxidative damage.
520 $a To increase the ROS scavenging capabilities of alfalfa, constructs containing either an MnSOD or APX cDNA, independently driven by the CaMV 35S constitutive promoter, were used to transform alfalfa (<italic>Medicago sativa</italic> cv. Regen SY). Independent transformants were identified by expression of their respective transgene.
520 $a A non-transformed (control) and three transformed lines were subjected to moderate drought (ΨW = −1.5 MPa). While there was no significant difference in the ΨW between the transformed and control lines during drought, the transformed lines had less wilting than control. Northern analysis of RuBisCO and GS2, in the leaves, and GS1, Lb, <italic>nif</italic>H and sucrose synthase (SuSy), in the nodules, revealed lower level of transcripts in the control line during moderate drought. GS specific activity was also found to be lower in non-transformed nodules during drought. In addition, non-transformed nodules had a 1.5-fold increase in TBARS while transformed nodules had less than a 0.5-fold increase in TBARS.
520 $a The results suggest that the transformed lines retain higher cellular function than non-transformed alfalfa during moderate drought and that increasing ROS scavenging capabilities, through genetic engineering, may aid in increasing drought tolerance in alfalfa.
590 $a School code: 0143.
650 4 $a Agriculture, Agronomy. $3 1018679
650 4 $a Biology, Molecular. $3 1017719
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690 $a 0307
710 2 0 $a New Mexico State University. $3 783784
773 0 $t Dissertation Abstracts International $g 63-11B.
790 $a 0143
790 1 0 $a Sengupta-Gopalan, Champa, $e advisor
791 $a Ph.D.
792 $a 2002
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3072021