caa a22 4500 606217932 CHVBK 20210128101110.0 cr unu---uuuuu 210128e20150401xx s 000 0 eng 10.1007/s11104-014-2361-9 doi (NATIONALLICENCE)springer-10.1007/s11104-014-2361-9 Hydrotropism in lateral but not in pivotal roots of desert plant species under simulated natural conditions [Elektronische Daten] [Aranzazú Guevara, Carla Giordano] Aims: Root hydrotropism has been widely studied in seedling radicles through artificial experiments that reduce the influence of gravity and soil. In this work we aimed to study hydrotropism of primary lateral and pivotal roots in developed root systems of desert plants under simulated natural conditions. Methods: We grew Bulnesia retama Griseb. (non phreatophyte), Prosopis flexuosa DC. (facultative phreatophyte) and Prosopis alpataco Phil.(obligate phreatophyte) seedlings in observation boxes with sand. Lateral and pivotal roots were stimulated by lateral water gradients and hydrotropic responses, root proliferation and root : shoot ratios were measured. Results: We found that 65 ± 15% of lateral roots that grew in response to water gradients in B. retama, 84 ± 8% in P. flexuosa and 88 ± 8% in P. alpataco displayed hydrotropism. Conversely, pivotal roots did not show hydrotropic growth. This was accompanied by root proliferation inside water patches, and biomass partitioning to shoot growth. Conclusions: Our results provide evidence that root hydrotropism is a relevant response that could occur in nature. Lateral and pivotal roots manifest different hydrotropic responses under the conditions assayed. The combination of hydrotropism and precise root proliferation can shape root architecture, leading to optimum water patch exploration. Springer International Publishing Switzerland, 2014 Bulnesia retama nationallicence Hydrotropism nationallicence Prosopis alpataco nationallicence Prosopis flexuosa nationallicence Root proliferation nationallicence R : S ratio nationallicence R : S ratio : Root : shoot ratio nationallicence GSA : Gravitropic set point angle nationallicence ψs : Soil water potential nationallicence d.f : Degrees of freedom nationallicence Guevara Aranzazú Consejo Nacional de Investigaciones en Científicas y Técnicas (CCT-Mendoza CONICET), Instituto Argentino de Investigaciones en Zonas Áridas (IADIZA), Av. Ruiz Leal s/n, Parque General San Martín, CP 5500, Mendoza, Argentina aut Giordano Carla Consejo Nacional de Investigaciones en Científicas y Técnicas (CCT-Mendoza CONICET), Instituto Argentino de Investigaciones en Zonas Áridas (IADIZA), Av. Ruiz Leal s/n, Parque General San Martín, CP 5500, Mendoza, Argentina aut Plant and Soil Springer International Publishing 389/1-2(2015-04-01), 257-272 0032-079X 389:1-2<257 2015 389 11104 https://doi.org/10.1007/s11104-014-2361-9 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s11104-014-2361-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Guevara Aranzazú Consejo Nacional de Investigaciones en Científicas y Técnicas (CCT-Mendoza CONICET), Instituto Argentino de Investigaciones en Zonas Áridas (IADIZA), Av. Ruiz Leal s/n, Parque General San Martín, CP 5500, Mendoza, Argentina aut NATIONALLICENCE 700 1- Giordano Carla Consejo Nacional de Investigaciones en Científicas y Técnicas (CCT-Mendoza CONICET), Instituto Argentino de Investigaciones en Zonas Áridas (IADIZA), Av. Ruiz Leal s/n, Parque General San Martín, CP 5500, Mendoza, Argentina aut NATIONALLICENCE 773 0- Plant and Soil Springer International Publishing 389/1-2(2015-04-01), 257-272 0032-079X 389:1-2<257 2015 389 11104