Catálogo de publicaciones - revistas

<jats:title>Abstract</jats:title><jats:sec> <jats:title>Purpose</jats:title> <jats:p>The ecological cultivation of <jats:italic>Panax notoginseng</jats:italic> under a forest canopy relies on the coupling of the <jats:italic>P. notoginseng</jats:italic> growth environment and the forest ecosystem</jats:p> </jats:sec><jats:sec> <jats:title>Methods</jats:title> <jats:p>In this study, six tree species, such as <jats:italic>Platycladus orientalis</jats:italic> (L.) Franco, were chosen to research the effects of species interactions on the growth, quality, and disease occurrence under intercropping with <jats:italic>P. notoginseng</jats:italic>, with single <jats:italic>P. notoginseng</jats:italic> serving as the control.</jats:p> </jats:sec><jats:sec> <jats:title>Results</jats:title> <jats:p>Intercropping <jats:italic>P. notoginseng</jats:italic> with PO (<jats:italic>Platycladus orientalis</jats:italic>, a coniferous tree species) or with SW (<jats:italic>Schima wallichii</jats:italic> Choisy, a broad-leaved tree species) promoted the accumulation of <jats:italic>P. notoginseng</jats:italic> biomass, reduced the occurrence of root rot, improved the contents of nitrogen, phosphorus and potassium in <jats:italic>P. notoginseng</jats:italic>, and increased the saponin concentration. Then, 43 differentially abundant metabolites were screened in the <jats:italic>P. notoginseng</jats:italic>-tree intercropping system by soil metabolism analysis and compared with those in the monocropped system. Indole-3-carboxaldehyde showed a significant negative relationship with the occurrence of root rot disease and inhibited <jats:italic>Fusarium oxysporum</jats:italic>. In addition, 2-naphthalenesulfonic acid was significantly positively correlated with biomass and increased the dry weight in the underground part of <jats:italic>P. notoginseng</jats:italic> in the pot experiments. </jats:p> </jats:sec><jats:sec> <jats:title>Conclusions</jats:title> <jats:p>Thus, the coniferous tree species PO and the broad-leaved tree species SW are potentially good neighbours of <jats:italic>P. notoginseng</jats:italic>, and soil metabolic changes may be important mechanisms for the growth and disease resistance benefits observed in the understorey of <jats:italic>P. notoginseng</jats:italic>.</jats:p> </jats:sec>

<jats:title>Abstract</jats:title><jats:sec> <jats:title>Aims</jats:title> <jats:p>The transcription factors bZIP19 and bZIP23 function as central regulators of the Zn deficiency response, and also as sensors of intracellular Zn concentration through their protein Zn-Sensor Motif (ZSM). While under Zn deficiency the target genes of bZIP19/23 are transcriptionally activated, under Zn sufficiency the binding of Zn<jats:sup>2+</jats:sup> ions to the ZSM halts gene expression. Mutations, including deletions, in the ZSM affect the activity of bZIP19/23 and leads to a Zn-insensitive and constitutive activation of target gene expression. Here we investigated the effects of such deregulation of the Zn deficiency response on plant growth and Zn accumulation, and evaluate whether this deregulation influences Cd accumulation.</jats:p> </jats:sec><jats:sec> <jats:title>Methods</jats:title> <jats:p>We analysed Arabidopsis lines constitutively expressing <jats:italic>bZIP19</jats:italic> with the ZSM deleted and measured developmental traits and ionomics in soil-grown plants, comparing control and Cd-spiked soils.</jats:p> </jats:sec><jats:sec> <jats:title>Results</jats:title> <jats:p>Results indicated that deletion of the ZSM, and the consequent deregulation of the Zn deficiency response, does not cause visible penalties in plant growth, development or reproduction. Compared with the wild-type, bZIP19-ZSM deletion increased Zn accumulation in leaves and seeds, and such an increase was mostly limited to Zn. In seeds, the increased Zn content appears distributed evenly throughout the embryo. Exposure of bZIP19-ZSM deletion to a low-level Cd contamination did not cause enhanced Cd accumulation, which is important given that Cd uptake is a concern in crop Zn biofortification. Finally, we verified that the bZIP19-ZSM deletion represents a gain-of-function dominant mutation. </jats:p> </jats:sec><jats:sec> <jats:title>Conclusion</jats:title> <jats:p>Together, results support that modulation of F-bZIP transcription factor’s activity may be a promising avenue for Zn biofortification in crops. </jats:p> </jats:sec>

<jats:title>Abstract</jats:title><jats:sec> <jats:title>Aims</jats:title> <jats:p>The allocation of recent plant photosynthates to soil via arbuscular mycorrhizal (AM) fungi is a critical process driving multiple ecosystem functions in grasslands. Yet, our understanding of how defoliation modifies below-ground allocation of recent plant photosynthate and its response to drought, which is becoming more intense and frequent, remains unresolved.</jats:p> </jats:sec><jats:sec> <jats:title>Methods</jats:title> <jats:p>Here we undertook a <jats:sup>13</jats:sup>C pulse-labelling experiment in a mesotrophic temperate grassland to evaluate in situ how defoliation intensity modifies the transfer of recently assimilated <jats:sup>13</jats:sup>C from plant shoots to roots, extraradical AM fungal hyphae, soil, and <jats:sup>13</jats:sup>C-CO<jats:sub>2</jats:sub> efflux (soil respiration) in response to simulated drought.</jats:p> </jats:sec><jats:sec> <jats:title>Results</jats:title> <jats:p>We found that, individually, both defoliation and drought reduced initial plant <jats:sup>13</jats:sup>C uptake, but when defoliation and drought were combined, we detected a significant reduction in below-ground <jats:sup>13</jats:sup>C allocation to soil. Furthermore, while defoliation stimulated <jats:sup>13</jats:sup>C transfer to plant roots and soil, high intensity defoliation amplified <jats:sup>13</jats:sup>C-CO<jats:sub>2</jats:sub> efflux relative to the amount of <jats:sup>13</jats:sup>C taken up by plants. Drought stimulated <jats:sup>13</jats:sup>C transfer to fungal hyphae relative to initial plant uptake. High intensity defoliation, however, suppressed both <jats:sup>13</jats:sup>C enrichment of extraradical AM fungal hyphae and <jats:sup>13</jats:sup>C transfer to fungal hyphae relative to initial uptake.</jats:p> </jats:sec><jats:sec> <jats:title>Conclusions</jats:title> <jats:p>Our findings suggest that defoliation can reduce the transfer of recent photosynthate below-ground under simulated drought and provide new insights into how defoliation may influence grassland C allocation dynamics and cycling between plants and AM fungi in grasslands facing drought. </jats:p> </jats:sec>