Forage biomass yield and arbuscular mycorrhizal symbiosis in a legume and C3 and C4 grasses under increasing soil phosphorus availability

2020 ◽  
Vol 71 (10) ◽  
pp. 907
Author(s):  
Tomás Chippano ◽  
Ileana García ◽  
Noelia Cofré ◽  
Rodolfo Mendoza

Phosphorus (P) is the main limiting factor for forage production in grasslands. It is important to determine levels of available P in soil that optimise production with minimum impact on arbuscular mycorrhizal (AM) symbiosis. We investigated the effects of increasing P availability on biomass production, root morphology, AM symbiosis and P acquisition of a forage legume (Lotus tenuis), a C3 grass (Schedonorus arundinaceus) and a C4 grass (Panicum coloratum) growing on a P-deficient soil in pots with P applied at rates of 0–160 mg kg–1 dry soil. The three forage species responded strongly to addition of P, with 90% of maximum shoot growth reached at available P levels of 24.3 mg kg–1 for L. tenuis, 14.4 mg kg–1 for P. coloratum and 11.2 mg kg–1 for S. arundinaceus. Lotus tenuis and P. coloratum produced higher yields of shoot biomass than S. arundinaceus. Root dry weight was higher in the legume than in the grasses, with the root-mass fraction being lowest in P. coloratum. AM colonisation was higher in L. tenuis roots than in grass roots, and decreased with increased soil P availability, especially in grasses. Low to moderate additions of P did not affect, and could even improve, AM colonisation in L. tenuis roots. For L. tenuis, it is possible to increase forage yield while maintaining high values of AM colonisation at 10–20 mg kg–1 of available P, but for grasses, especially S. arundinaceus, it is difficult to achieve both objectives. The presence of L. tenuis in grasslands or pastures may contribute to maintaining the native AM inoculum under a wide range of soil P availability in regions such as the Salado River basin of Argentina.

2012 ◽  
Vol 49 (2) ◽  
pp. 201-212 ◽  
Author(s):  
Simoneta Negrete-Yankelevich ◽  
Ignacio Eduardo Maldonado-Mendoza ◽  
Jesús Omar Lázaro-Castellanos ◽  
Wendy Sangabriel-Conde ◽  
Juan Carlos Martínez-Álvarez

CATENA ◽  
2021 ◽  
Vol 205 ◽  
pp. 105459
Author(s):  
Liuming Yang ◽  
Zhijie Yang ◽  
Xiaojian Zhong ◽  
Chao Xu ◽  
Yanyu Lin ◽  
...  

2018 ◽  
Vol 34 (3) ◽  
pp. 326-334 ◽  
Author(s):  
J. Yuan ◽  
L. Wang ◽  
S. Wang ◽  
Y. Wang ◽  
H. Wang ◽  
...  

2019 ◽  
Vol 54 ◽  
pp. 11-19 ◽  
Author(s):  
Martin Kohler ◽  
Jörg Niederberger ◽  
Adrian Wichser ◽  
Peggy Bierbaß ◽  
Thomas Rötzer ◽  
...  

2015 ◽  
Vol 42 (1) ◽  
pp. 1 ◽  
Author(s):  
Qianhe Liu ◽  
Anthony J. Parsons ◽  
Hong Xue ◽  
Chris S. Jones ◽  
Susanne Rasmussen

Phosphate (P) uptake is critical for plant growth, but to date little is known about P uptake and transport in the pasture grass Lolium perenne L. We have identified a putative P transporter (PT) from L. perenne mycorrhizal roots (LpPT1) and assessed its transcriptional regulation by soil P availability and mycorrhizal colonisation. We also investigated transcript levels of fungal PTs from the two arbuscular mycorrhizal species Rhizophagus intraradices and Funneliformis mosseae. Our analyses indicated that LpPT1 codes for a high affinity PT most likely responsible for direct P uptake from the soil. LpPT1 is highly expressed in roots of plants grown at low P, whereas high P repressed its expression. LpPT1 was not expressed in above-ground plant tissues. Colonisation with R. intraradices did not affect expression of LpPT1 significantly. Transcript levels of the R. intraradices PT were not affected by P availability but the F. mosseae PT was repressed by high P supply, particularly in intraradical hyphae. Our study could assist in deciphering the molecular mechanisms of P uptake in the pasture grass L. perenne.


2007 ◽  
Vol 23 (6) ◽  
pp. 693-704 ◽  
Author(s):  
Travis Idol ◽  
Patrick J. Baker ◽  
Dean Meason

Precipitation and temperature are known to have important effects on forest productivity, but these effects may be strongly mediated through their influence on soil and leaf nutrients. We measured indicators of forest productivity and soil and leaf nutrients across independent gradients of precipitation and elevation/temperature in lower montane Hawaiian forests dominated by a single overstorey species, Acacia koa, situated on 1500–3000-y-old soils that were mixtures of volcanic ash and basalt. Stand basal area was highest at the wettest site, 2000 mm mean annual precipitation (MAP), and leaf N and P were lowest at the driest site, 1000 mm MAP. Soil N availability and leaf N concentration declined across an 850-m elevation gradient, but this was not correlated with stand basal area or soil organic matter content. Across all stands, basal area was negatively correlated with the exchangeable soil P fraction. As well, the soil C:N ratio was negatively correlated with both soil P availability and the size of the primary mineral P fraction. Soil P availability and weathering appear to be important determinants of soil organic matter quantity and quality. Overall, precipitation is the major driving force for forest productivity, but P weathering and availability play important roles in limiting productivity in wetter sites and in controlling soil organic matter dynamics in these N-fixing forests.


2015 ◽  
Vol 51 (3) ◽  
pp. 370-381 ◽  
Author(s):  
ANNY RUTH PAME ◽  
CHRISTINE KREYE ◽  
DAVID JOHNSON ◽  
SIGRID HEUER ◽  
MATHIAS BECKER

SUMMARYSeedling vigor is important to help ensure good crop establishment. In direct-seeded rice, this is particularly relevant when soil conditions are marginal. In Asia, about one third of the area of rainfed rice is situated on unfavorable soils, many of which are low in plant available P. In such environments, as farmers tend to have few resources, options to overcome poor crop establishment should be low cost and preferably seed-based. The P content of seed depends on genotype and can be augmented by soaking seeds in a P-containing solution prior to seeding (P-priming). In addition, the presence of the Pup1 quantitative trait locus can reportedly confer tolerance to low soil P availability. We tested combinations of seed priming (unprimed control, water priming, P-priming), and inherent seed P concentrations in contrasting rice genotypes (DJ123, Sadri Tor Misri), and two near isogenic sister lines of IR74 with (+Pup1) and without (−Pup1) the Pup1 QTL. Treatment effects on germination were studied in Petri dishes, while seedling growth and P accumulation were assessed using pots with P deficient soil. Germination was less than 75% in seeds with low seed P content. Seed priming with both water and P enhanced germination and seedling growth. In plants growing from high P seeds, water priming outperformed P-priming. In Sadri Tor Misri with low seed P, we observed a tendency for better performance in some parameters when P-primed. While the presence of the Pup1 QTL in IR74 increased shoot biomass and total root length, these effects could be further enhanced by water priming. Combining genetic and seed management approaches may contribute to improved rice establishment in P deficient soils but its effectiveness depends on genotype and seed attributes.


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