Differential responses of three <i>Urochloa</i> species to low phosphorus availability

Baptistella, João Leonardo Corte; Llerena, Juan Pablo Portilla; Domingues-Júnior, Adilson Pereira; Fernie, Alisdair R.; Favarin, José Laércio; Mazzafera, Paulo

doi:10.1111/aab.12694

Cited by 7 publications

(9 citation statements)

References 73 publications

(87 reference statements)

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“…There were no differences in RDM among treatments, which might also be related to the low requirements of P of U. decumbens (do Valle et al, 2011;Kanno et al, 1999;Rao et al, 1996). A 10-fold increase in P availability in hydroponic solution had little effect on U. decumbens root mass (Baptistella et al, 2021). Louw-Gaume et al (2017) report that root morphological traits do not change with P supply in U. decumbens, and that the plant is little responsive to P in terms of RDM and SDM.…”

Section: Dry Massmentioning

confidence: 99%

“…In the rhizotrons, interestingly, P availability through the profile did not increase biomass production, meaning that U. decumbens had all the P needed in the superficial layers, a result of its low P requirements and, consequently, low responsiveness to P (Baptistella et al, 2021;do Valle et al, 2011;Louw-Gaume et al, 2017;Rao et al, 1996). Also, the strong and positive correlation among SDM, total P content, labile P, and moderately labile P in the upper layer suggest, in a practical sense, that the current recommendations to supply P at the superficial layers can produce the best results regarding total biomass production.…”

Section: Phosphorus Cyclingmentioning

confidence: 99%

“…Also, under Urochloa cultivation, increases in labile and moderately labile P fractions and reduction in non-labile P forms in the long term were observed (Almeida and Rosolem, 2016). Moreover, Urochloa species have differential responses to low P availability, which may account for the differences in P uptake and adaptability to low P availability (Baptistella et al, 2021): U. brizantha and U. ruziziensis have higher exudation of root metabolites when compared to U. decumbens. U. ruziziensis shows higher relative expression of root P transporters (PHT1 gene family) than U. decumbens and U. brizantha (Baptistella et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

“…Urochloa is adapted to low P availability and has developed mechanisms to improve P solubilization and uptake (Baptistella et al, 2021). Examples of these mechanisms are root exudation of organic acids and acid phosphatase enzymes, symbiotic association with mycorrhizal fungi, and enhanced root growth for better exploring the soil (Louw-Gaume et al 2010Teutscherova et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, Urochloa species have differential responses to low P availability, which may account for the differences in P uptake and adaptability to low P availability (Baptistella et al, 2021): U. brizantha and U. ruziziensis have higher exudation of root metabolites when compared to U. decumbens. U. ruziziensis shows higher relative expression of root P transporters (PHT1 gene family) than U. decumbens and U. brizantha (Baptistella et al, 2021). Along with these mechanisms, the high biomass production and the deep and vigorous root system make Urochloa an interesting option for increasing PUE in the Brazilian agroecosystems (Baptistella et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

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Phosphorus cycling byUrochloa decumbensintercropped with coffee

et al. 2022

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Summary Phosphorus (P) is a limiting resource for agricultural production in the tropics. Urochloa spp. is commonly used as a cover crop and has mechanisms to mobilize partially the nonavailable P forms from the soil. The use of Urochloa intercropped with Arabica coffee (Coffea arabica L.) is increasing in Brazil, but P cycling has been overlooked in this system. Here, we proposed two experiments to test the hypothesis that Urochloa decumbens could mobilize and absorb P from deep soil layers and increase overall P cycling of the intercrop system. We measured U. decumbens root and shoot dry mass (SDM), root morphology and activity, nutrient uptake, soil nutrient availability, and soil P fractionation in both experiments. To better understand P cycling by Urochloa alone, in the first experiment, U. decumbens was cultivated in rhizotrons where adequate P was supplied in distinct soil layers – 0.0 to 0.3 m, 0.3 to 0.8 m, 0.8 to 1.3 m, and 1.3 to 2 m. Root dry mass (RDM) and morphology were not affected by P availability. Moreover, total biomass production (root plus shoot) and P uptake were higher when P was available in the superficial top soil layer compared to P availability in more than one layer or only in the bottom layer. Nevertheless, U. decumbens was able to reach and acquire P from depth. Correlation analysis showed that P cycling was strongly dependent on SDM, labile, and moderately labile fractions of soil P and was not significantly correlated with RDM. The second experiment aimed at verifying P uptake and mobilization from different soil depths in field conditions. P was supplied in different depths of the soil profile – 0.3 m, 0.6 m, and 0.9 m – in the field with preestablished U. decumbens intercropped with Arabica coffee plants. Shoot P content was higher at the first sample date when P was supplied at 0.3 m, compared to 0.6 m, 0.9 m, and control with no P. Soil P fractionation showed that there was no P mobilization of less labile forms by U. decumbens during the evaluated time. Our results showed that P fertilization in the top layer rather than suppling P trough the soil profile can maximize U. decumbens growth. Also, Urochloa P accumulation was enough to support coffee demand even in high yields and can be an alternative to increase P use efficiency in coffee production systems, being an effective recycler of P.

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Section: Dry Massmentioning

confidence: 99%

Section: Phosphorus Cyclingmentioning

confidence: 99%