How Do Plants Achieve Tolerance to Phosphorus Deficiency? Small Causes with Big Effects

摘要: Genotypic differences in phosphorus (P) uptake from P-deficient soils may be due to higher root growth or external efficiency (micrograms of P taken up per square centimeter surface area). Both factors are highly interrelated because any additional provided by externally efficient roots will also stimulate growth. It necessary separate both identify a primary mechanism formulate hypotheses on pathways and genes causing genotypic uptake. For this purpose, plant model was developed for rice (Oryza sativa) grown under conditions. Model simulations showed that small changes growth-related parameters had big effects Increasing fineness the internal dry matter production (dry accumulated unit distributed roots) 22% sufficient increase factor three. That same effect could achieved 33% efficiency. However, direct increasing accounted little over 10% 3-fold The remaining 90% enhanced as result size. These results demonstrate large soil can caused rather tolerance mechanisms. Such particularly difficult detect they likely overshadowed secondary effects.