Microarray analyses showed that root exudates affected the transcriptome of P. aeruginosa PAO1 by influencing genes encoding enzymes related to alginate biosynthesis and twitching motility [ 82].
Microarray analyses of Pachycladon roots are also underway to help test the hypothesis that adaptation to different soil types has been a major driver of diversification in Pachycladon.
In this study, several genes associated with different root architectural traits were identified, based on microarray analyses (Table 4) and whole genome sequencing analysis of two G soja lines IT182932 and PI 407162 (Tables 7 and 8).
In different studies, microarray analyses have been performed on root, leaf and panicle under drought stress (Smita et al. 2013) and on two contrasting genotypes under drought stress (Lenka et al. 2011), rice samples subjected to heat and/or oxidative stresses (Mittal et al. 2012a, 2012b) and heat stress followed by recovery (Sarkar et al. 2014).
The bacteria were root-inoculated and leaf tissues were sampled for microarray analyses.
Microarray analyses of Arabidopsis and tomato roots subjected to increased NO3- identified hundreds of differentially regulated genes whose functions included N metabolism, cell growth, and transcription [ 19, 21].
This method has been applied to quantitative trait locus analysis of rhizotoxicities [ 18] and for monitoring root tip viability [ 19], suggesting that it would also be suitable for obtaining root samples to determine the direct effects of rhizotoxins using microarray analyses.
Here detailed microarray analyses have been used to study the transcriptome of root nodules induced by either wild type or mutant strains of Sinorhizobium meliloti.
Through microarray analyses, early-responsive genes have been detected in rice roots but not in leaves when sampled after 20 min, 1 h, and 2 h of N-starvation [ 20, 22].
The results showed that all four ESTs had a strong induction in root tissue at 24 h post infection and the level of gene expression corroborated to that of microarray analyses.
