Model of P stress

Abscisic acid affects rice cell wall phosphate remobilization and P transporation

Abscisic acid (ABA) is a well-studied phytohormone known to be involved in sub-sets of stress responses in plants, such as iron (Fe) deficiency and phosphorus (P) deficiency in Arabidopsis. However, whether ABA is involved in P deficiency in rice has not frequently been studied. Zhu et al. decided to investigate the mechanism underlying ABA-aggravated P deficiency in rice (Oryza sativa).

Model of P stress

They used seeds of the rice cultivar β€˜Nipponbare’ (Nip, Oryza sativa). They prepared the seedlings in the same way for all experiments. They then set up tests to examine possible interactions between NO, ABA and ethylene in P-deficient rice.

The authors found P deficiency decreased ABA accumulation rapidly (within one h) in the roots. Under P deficiency, NO levels increase as quickly as ABA levels decrease, to inhibit both the ABA-induced reduction of pectin contents for the re-utilization of cell wall P and the ABA-induced down-regulation of OsPT6 for the translocation of P from roots to shoots. Overall, our results provide novel information indicating that the reduction of ABA under P deficiency is a very important pathway in the re-utilization of cell wall P in rice under P-deficient conditions, which should be a very effective mechanism for plant survival under P deficiency stress for common agronomic practice.

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The Annals of Botany Office is based at the University of Oxford.

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