Journal
PESQUISA AGROPECUARIA BRASILEIRA
Volume 44, Issue 9, Pages 1100-1105Publisher
EMPRESA BRASIL PESQ AGROPEC
DOI: 10.1590/S0100-204X2009000900005
Keywords
Triticum aestivum; phosphorus starvation; translocation
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Funding
- Apoio a Pesquisa do Estado do Rio Grande do Sul, for financial support
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior
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The objectives of this study were to determine low-P tolerance mechanisms in contrasting wheat genotypes and to evaluate the association of these mechanisms to differential gene expression. Wheat seedlings of cultivars Toropi (tolerant to low-P availability) and Anahuac (sensitive) were evaluated. Seedlings were hydroponically grown in the absence or presence of P (1.0 mmol L-1) during three different time periods: 24, 120 and 240 hours. Free phosphate (Pi) and total P contents were measured in shoots and roots. The experiment's design was in randomized blocks with three replicates, each formed by ten plants. The relative expression of genes encoding the malate transporter TaALMT1 and the transcription factor PTF1 was evaluated. Phosphorus starvation beyond ten days increased the expression of TaALMT1 only in 'Toropi'. PTF1's expression was early induced in both genotypes under P starvation, but remained significant after ten days only in 'Toropi'. Shoot Pi concentration in 'Toropi' was independent from P availability; under starvation, 'Toropi' favored the maintenance of shoot Pi concentration. The low-P tolerance of Toropi cultivar at initial growth stages is mainly due to its ability to maintain constant the Pi shoot level.
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