Publications - Molecular Signal Processing
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- Strieder, M. L. (1)
Displaying results 1 to 1 of 1.
Costa, C. T.; Strieder, M. L.; Abel, S.; Delatorre, C. A. Phosphorus and nitrogen interaction: loss of QC identity in response to P or N limitation is antecipated in pdr23 mutant Braz J Plant Physiol 23, 219-229, (2011) DOI: 10.1590/S1677-04202011000300006
Changes in root architecture are an important
adaptive strategy used by plants in response to limited nutrient
availability to increase the odds of acquiring them. The quiescent
center (QC) plays an important role by altering the meristem activity
causing differentiation and therefore, inducing a determinate growth
program. The arabidopsis mutant pdr23 presents primary short root in the
presence of nitrate and is inefficient in the use of nucleic acids as a
source of phosphorus. In this study the effect of the pdr23 mutation on
the QC maintenance under low phosphorus (P) and/or nitrogen is
evaluated. QC identity is maintained in wild-type in the absence of
nitrate and/or phosphate if nucleic acids can be used as an alternative
source of these nutrients, but not in pdr23. The mutant is not able to
use nucleic acids efficiently for substitute Pi, determinate growth is
observed, similar to wild-type in the total absence of P. In the absence
of N pdr23 loses the expression of QC identity marker earlier than
wild-type, indicating that not only the response to P is altered, but
also to N. The data suggest that the mutation affects a gene involved
either in the crosstalk between these nutrients or in a pathway shared
by both nutrients limitation response. Moreover loss of QC identity is
also observed in wild-type in the absence of N at longer limitation.
Less drastic symptoms are observed in lateral roots of both genotypes.