Low levels of ribosomal RNA partly account for the very high photosynthetic phosphorus-use efficiency of Proteaceae species
RONAN SULPICE, HIROFUMI ISHIHARA, ARMIN SCHLERETH, GREGORY R. CAWTHRAY, BEATRICE ENCKE, PATRICK GIAVALISCO, ALEXANDER IVAKOV, STÉPHANIE ARRIVAULT, RICARDA JOST, NICOLE KROHN, JOHN KUO, ETIENNE LALIBERTÉ, STUART J. PEARSE, JOHN A. RAVEN, WOLF-RÜDIGER SCHEIBLE, FRANÇOIS TESTE, ERIK J. VENEKLAAS, MARK STITT and HANS LAMBERS
Article first published online: 23 DEC 2013 | DOI: 10.1111/pce.12240
Proteaceae species in south-western Australia occur on phosphorus- impoverished soils. Their leaves contain very low phosphorus levels, but have relatively high rates of photosynthesis and activities of enzymes involved in primary metabolism, suggesting they do not compromise their metabolic machinery in order to save P. In contrast, we show that low ribosome abundance contributes to the high phosphorus-use efficiency of these Proteaceae species in three ways: less ribosomes means less P investment; the rate of growth and, hence, demand for phosphorus is decreased; young leaves show a delay in the formation of the photosynthetic machinery, exhibiting very low plastidic ribosome abundance and spreading investment of phosphorus in ribosomes over a longer time.