Project description:Two potato cultivars, Russet Burbank and Bionta, were inoculated with three different endophytes containing different AHL types. The impact of the endophytes to the different cultivars was measured by gene expression analysis with a customized microarray
Project description:Two potato cultivars, Russet Burbank and Bionta, were inoculated with three different endophytes containing different AHL types. The impact of the endophytes to the different cultivars was measured by gene expression analysis with a customized microarray B. phytofirmans type strain PsJN was originally isolated as a contaminant from surface-sterilized, Glomus vesculiferum-infected onion roots (Nowak et al., 1998), whereas strain P6 RG6-12 was isolated from the rhizosphere of a grassland in the Netherlands (Salles et al., 2006). This strain was selected based on its similarity to strain PsJN based on 16S rRNA gene homology, and similar phenotypic features. Both strains were generally cultivated on King's medium (King et al., 1954). For the mutant AHL to the strain B. phytofirmans PsJN a quorum quenching approach as described by Wopperer et al., 2006 was employed. Plasmid pMLBAD-aiiA, which contains aiiA, the Bacillus sp. 240B1 lactonase gene, was transferred to B. phytofirmans PsJN by triparental mating as described by de Lorenzo and Timmis (1994). 2 cultivars, 3 endophytes
Project description:Global expression analysis of transcripts in response to salt treatment was carried out for common wheat using oligo-DNA microarrays. Microarrays have been designed from unique wheat genes classified from a large number of expressed sequence tags (ESTs). Two-week-old seedlings of common wheat were treated with 150 mM NaCl for 1, 6 and 24 hours and their roots and shoots were separately subjected to microarray analyses. Consequently, 5996 genes showed changes in expression of more than two-fold, and were classified into 12 groups according to correlations in gene expression patterns. These salt-responsive genes were assigned functions using Gene Ontology (GO) terms. Genes assigned to transcription factor, transcription-regulator activity and DNA binding functions were preferentially classified into early response groups. On the other hand, those assigned transferase and transporter activity were classified into late response groups. These data on gene expression suggest that multiple signal transduction pathways in response to salt treatment exist in wheat. Salt-responsive transcription factors (TFs), namely AP2/EREBP, MYB, NAC and WRKY, were selected and their expression patterns compared with those of rice. Most showed different expression patterns in wheat and rice in response to salt treatment. Furthermore, comparing the microarray data for wheat and rice, only a small number of genes were up- or down-regulated in common in response to salt treatment. These findings suggest that salt-responsive mechanisms distinct from rice might be present in wheat, and wheat genes can contribute to providing novel gene resources for breeding of salt-tolerant crops. Keywords: time cource, stress response
Project description:Improvement of phosphorus (P) uptake by crops is a prerequisite for sustainable agriculture. Rice (Oryza sativa L.) PHOSPHORUS-STARVATION TOLERANCE 1 (OsPSTOL1) increases root growth and total P uptake. Here, a biogeographic survey of rice demonstrates OsPSTOL1 loss in a subset of japonica rice after the temperate-tropical split and frequent absence in paddy varieties of east Asia. OsPSTOL1 absence or loss-of-function alleles prevail in landraces from regions with fertilizer use and controlled irrigation, suggesting it is an adaptive genetic variant in low nutrient rainfed ecosystems. OsPSTOL1 is a truncated member of a family of multi-module kinases associated with microbial interactions. We demonstrate that ectopic expression of OsPSTOL1 in wheat (Triticum aestivum L.) increases shoot and root growth under low P conditions, promotes root plasticity, and hastens induction of the low P response pathway. OsPSTOL1’s influence on adaptive root development in wheat validates its potential for broad utilization in crop improvement.