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Leaf and root attributes as growth and phosphorus uptake determinants in two grass species from South America’s natural grasslands

Published online by Cambridge University Press:  10 March 2021

Anderson Cesar Ramos Marques Open the ORCID record for Anderson Cesar Ramos Marques [Opens in a new window] ,
Fernando Luiz Ferreira de Quadros ,
Gustavo Brunetto ,
Leticia Frizzo Ferigolo ,
Raissa Schwalbert ,
Bianca Knebel Del Frari ,
Gíllian Santos Fernandes  and
Fernando Teixeira Nicoloso
Anderson Cesar Ramos Marques*
Affiliation:
Biology Department, Federal University of Santa Maria (UFSM), Santa Maria, Rio Grande do Sul, Brazil
Fernando Luiz Ferreira de Quadros
Affiliation:
Animal Science Department, Federal University of Santa Maria (UFSM), Santa Maria, Rio Grande do Sul, Brazil
Gustavo Brunetto
Affiliation:
Soil Sciences Department, Federal University of Santa Maria (UFSM), Santa Maria, Rio Grande do Sul, Brazil
Leticia Frizzo Ferigolo
Affiliation:
Plant Physiology Department, Luiz de Queiroz Agriculture School (ESALQ), Piracicaba City, São Paulo, Brazil
Raissa Schwalbert
Affiliation:
Biology Department, Federal University of Santa Maria (UFSM), Santa Maria, Rio Grande do Sul, Brazil
Bianca Knebel Del Frari
Affiliation:
Biology Department, Federal University of Santa Maria (UFSM), Santa Maria, Rio Grande do Sul, Brazil
Gíllian Santos Fernandes
Affiliation:
Biology Department, Federal University of Santa Maria (UFSM), Santa Maria, Rio Grande do Sul, Brazil
Fernando Teixeira Nicoloso
Affiliation:
Biology Department, Federal University of Santa Maria (UFSM), Santa Maria, Rio Grande do Sul, Brazil
*
Author for correspondence:*Anderson Cesar Ramos Marques, Email: acrmarques@hotmail.com.br
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Abstract

Phosphorus uptake by grass species from natural South American grasslands can change depending on root and leaf attributes capable of determining higher, or lower, relative growth rate. The aim of the current study is to investigate whether leaf and root attributes capable of determining leaf and root area production in native C4 grass species Axonopus affinis and Andropogon lateralis are related to higher relative growth rate (RGR), P uptake capacity (maximum P influx; Imax) and concentration. Species grown in 2-litre pots with added nutrition solution were subjected to two treatments, namely 5 μM P l−1 and 30 μM P l−1. Solution aliquots (10 ml) were collected for 30 hours at the end of the study to determine P concentrations. RGR was 3.6 and 2.8 times higher in A. affinis than in A. lateralis in treatments with 5 μM P and 30 μM P. Axonopus affinis recorded the highest P concentration in leaf tissue. This outcome was associated with Imax 85% higher in A. affinis. High RGR was associated with larger leaf and root surface area per dry mass unit, as well as with high P influx capacity and with higher affinity transporters. These species often prevail in areas accounting for greater natural fertility and are more responsive to phosphate fertilization.

Keywords

Kinetic parametersleaf attributesnatural grasslandsnutrient uptakeroot attributes
Type
Research Article
Information
Journal of Tropical Ecology , Volume 36 , Issue 6 , November 2020 , pp. 275 - 281
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Copyright
© The Author(s), 2021. Published by Cambridge University Press

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