Phosphorus deficiency inhibits growth in parallel with photosynthesis in a C3 (Panicum laxum) but not two C4 (P. coloratum and Cenchrus ciliaris) grasses

Functional Plant Biology : FPB
Oula W S Ghannoum, Jann P Conroy

Abstract

This study compared the growth and photosynthetic responses of one C3 (Panicum laxum L.) and two C4 grasses (Panicum coloratum L. and Cenchrus ciliaris L.) to changes in soil phosphorus (P) nutrition. Plants were grown in potted soil amended with six different concentrations of P. One week before harvest, leaf elongation and photosynthetic rates and the contents of carbohydrate, P and inorganic phosphate (Pi) were measured. Five weeks after germination, plants were harvested to estimate biomass accumulation. At each soil P supply, leaf P contents were lower in the C3 (0.6-2.6 mmol P m-2) than in the two C4 grasses (0.8-4.1 mmol P m-2), and Pi constituted ~40-65% of total leaf P. The P deficiency reduced leaf growth, tillering and plant dry mass to a similar extent in all three grasses. In contrast, P deficiency suppressed photosynthetic rates to a greater extent in the C3 (50%) than the C4 grasses (25%). The foliar contents of non-structural carbohydrates were affected only slightly by soil P supply in all three species. Leaf mass per area decreased at low P in the two C4 grasses only, and biomass partitioning changed little with soil P supply. The percentage changes in assimilation rates and plant dry mass were linearly relate...Continue Reading

References

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Citations

Mar 9, 2011·Physiologia Plantarum·John A Raven
Oct 15, 2013·Journal of Experimental Botany·John A Raven
Mar 6, 2015·Journal of Experimental Botany·Iker Hernández, Sergi Munné-Bosch
Jan 1, 2015·Nature Plants·H LambersM Stitt
Jan 6, 2011·Journal of Integrative Plant Biology·Caitlin S ByrtRobert T Furbank
Feb 18, 2011·Photosynthesis Research·John A RavenStephen C Maberly
May 1, 2008·Functional Plant Biology : FPB·Oula GhannoumJann P Conroy

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