Crosstalk in plant responses to biotic and abiotic stresses
Başlık çevirisi mevcut değil.
- Tez No: 402327
- Danışmanlar: PROF. E. TAPIO PALVA, DR. GÜNTER BRADER
- Tez Türü: Doktora
- Konular: Botanik, Botany
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2015
- Dil: İngilizce
- Üniversite: Unıversıty Of Helsınkı
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Çevre Bilimleri Ana Bilim Dalı
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: Belirtilmemiş.
Özet
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Özet (Çeviri)
In order to protect themselves against several biotic and abiotic stresses, plants are equipped with an array of defense mechanisms. Induced defenses and stress responses play a major role in plant disease resistance and are regulated by a network of interconnected signal transduction pathways with the plant hormones ethylene (ET), jasmonic acid (JA) and salicylic acid (SA) as the crucial mediators. These specific hormone-mediated signaling cascades trigger the expression of distinct sets of stress-related genes leading to tolerance or resistance. F-box proteins are important components in mediating stress responses. They act as members of Skp1-Cullin-F-box (SCF) protein complexes, which target substrate proteins for modification and degradation and thereby allow plants to respond rapidly to environmental stress factors. Arabidopsis genome encodes roughly 700 F-box proteins involved in various processes including plant metabolism, hormonal responses as well as responses to environmental stresses. The amount of F-box proteins in plants is significantly higher than in other eukaryotes indicating SCF-dependent ubiquitination to be a major route for selective protein degradation in plants. In this study we screened a group of Arabidopsis F-box T-DNA lines for their tolerance to several abiotic and biotic stresses. To do this, we employed a reverse genetic screening approach and characterized the phenotypes of the T-DNA mutant lines. Among the tested lines, two T-DNA insertion lines with insertions in genes encoding MAX2 and AFB4 demonstrated altered response to ozone and pathogens, respectively, and were therefore chosen for further characterization. In the last part of the thesis, the role of EARLY RESPONSIVE TO DEHYDRATION 15 (ERD15), a negative regulator of abscisic acid responses in Arabidopsis was further characterized concerning its role in biotic stress responses in Arabidopsis.
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