AGL21 overexpression plants produced more and longer lateral roots while agl21 mutants showed impaired lateral root development, especially under nitrogen-deficient conditions.
Under all oxygen conditions, francci3_3143 mRNA levels increased 10 15-fold 10 15-foldogen-deficient (N2) conditions.
Under nitrogen-deficient conditions the level of ammonium ions increased under lower oxygen tension.
The mRNA level of francci3_3143 correlated the best with nitrogen regulation, being increased under nitrogen-deficient conditions.
Under nitrogen-deficient (N2) conditions, vesicles were produced and correlated with oxygen tensions.
Furthermore, vesicle production under nitrogen-deficient (N2) conditions positively correlated with oxygen tension.
The level of francci3_3142 mRNA was decreased under nitrogen-deficient (N2) conditions and showed 7-fold increase under hyperoxic under nitrogen-replete conditions.
Under hyperoxic conditions, the mRNA levels of katA increased 6.5- and 8-fold under nitrogen-deficient (N2) and nitrogen-replete (NH4) conditions, respectively.
Under nitrogen-deficient (N2) conditions, the mRNA levels of both genes (sqhC and hpnC) increased 2- and 1.5-fold, respectively.
Transcriptome studies on Frankia sp. strain CcI3 under nitrogen-deficient and nitrogen-replete conditions also show an increase in nifHDK gene expression [ 35, 36].
