Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network

Open Access. Powered by Scholars. Published by Universities.®

PDF

Iowa State University

Plant Sciences

Graduate Theses and Dissertations

Arabidopsis

Publication Year

Articles 1 - 4 of 4

Full-Text Articles in Entire DC Network

A Clade-Specific Arabidopsis Gene Connects Primary Metabolism And Senescence, Dallas Christopher Jones Jan 2015

A Clade-Specific Arabidopsis Gene Connects Primary Metabolism And Senescence, Dallas Christopher Jones

Graduate Theses and Dissertations

Plants have to deal with environmental insults as they cannot move to escape from stressful conditions. To do so, they have evolved novel components that respond to the changing environment. The Qua Quine Starch (QQS) gene is an Arabidopsis-specific orphan gene that connects primary metabolism and adaptation to environment changes. AT1G64360, which we term an SAQR (Senescence-associated and QQS-related) gene, respond to oxidative stress. Here, we show that SAQR is up-regulated in high-starch QQS-RNAi mutants. Bioinformatics analyses indicates that SAQR is unique to six species within the family Brassicaceae; the gene may have arisen about 20 million years ago (MYA ...


Investigation Of The Arabidopsis Nonhost Resistance Mechanism Against The Soybean Pathogen, Phytophthora Sojae, Rishi Sumit Jan 2013

Investigation Of The Arabidopsis Nonhost Resistance Mechanism Against The Soybean Pathogen, Phytophthora Sojae, Rishi Sumit

Graduate Theses and Dissertations

Nonhost resistance (NHR) provides immunity to all members of a plant species against all isolates of a microorganism that is pathogenic to other plant species. Three Arabidopsis thaliana PEN (penetration deficient) genes, PEN1, 2 and 3 have been shown to provide prehaustorial NHR against the barley pathogen Blumeria graminis f. sp. hordei. Arabidopsis pen1-1 mutant is penetrated by the hemibiotrophic oomycete pathogen, Phytophthora sojae that causes root and stem rot disease in soybean. The P. sojae susceptible (pss) 1 mutant is infected by both P. sojae and the hemibiotrophic fungal pathogen, Fusarium virguliforme that causes sudden death syndrome in soybean ...


Analysis Of The Function And The Regulation Of Autophagy In Arabidopsis Thaliana, Yimo Liu Jan 2012

Analysis Of The Function And The Regulation Of Autophagy In Arabidopsis Thaliana, Yimo Liu

Graduate Theses and Dissertations

Plants have developed sophisticated mechanisms to survive under adverse growth conditions. Autophagy is activated in response to multiple abiotic stresses, pathogen infection and senescence in plants. Upon induction of autophagy, portions of cytoplasm are engulfed by double membrane structures termed autophagosomes and are delivered to vacuole for degradation. Over the past decade, the identification of many autophagy-related genes in plants has greatly enhanced our molecular and physiological understanding of plant autophagy. However, the upstream regulatory components in the autophagy pathway and the function of autophagy under various stresses are still unclear. This thesis summarizes my efforts in studying the function ...


A Look Into The Molecular Mechanisms Of Parasitism Including The Functional Characterization Of Heterodera Schachtii Secreted Effector Proteins And The Response Of Plant Small Rna To Nematode Infection, Peter Jacob Howe Jan 2011

A Look Into The Molecular Mechanisms Of Parasitism Including The Functional Characterization Of Heterodera Schachtii Secreted Effector Proteins And The Response Of Plant Small Rna To Nematode Infection, Peter Jacob Howe

Graduate Theses and Dissertations

Cyst nematodes are some of the most destructive plant pathogens. These biotrophic parasites form elaborate feeding sites, syncytia, in the roots of their host plants and remove valuable nutrients from the plant. During the formation of the syncytium the nematode secretes effector proteins into root cells, which causes extensive molecular changes in the cell and allows the parasite to manipulate cellular processes. The work reported here describes the functional characterization of three nematode effector proteins and a report profiling the role of host small RNAs in the infection process.