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Dynamic soil hydraulic resistance regulates stomata.
Manandhar, Anju; Rimer, Ian M; Soares Pereira, Talitha; Pichaco, Javier; Rockwell, Fulton E; McAdam, Scott A M.
Afiliación
  • Manandhar A; Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN, 47907, USA.
  • Rimer IM; Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN, 47907, USA.
  • Soares Pereira T; Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN, 47907, USA.
  • Pichaco J; Irrigation and Crop Ecophysiology Group, Instituto de Recursos Naturales y Agrobiología de Sevilla (IRNAS, CSIC), Ave Reina Mercedes 10, 41012, Seville, Spain.
  • Rockwell FE; Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA, 02138, USA.
  • McAdam SAM; Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN, 47907, USA.
New Phytol ; 244(1): 147-158, 2024 Oct.
Article en En | MEDLINE | ID: mdl-39096020
ABSTRACT
The onset of stomatal closure reduces transpiration during drought. In seed plants, drought causes declines in plant water status which increases leaf endogenous abscisic acid (ABA) levels required for stomatal closure. There are multiple possible points of increased belowground resistance in the soil-plant atmospheric continuum that could decrease leaf water potential enough to trigger ABA production and the subsequent decreases in transpiration. We investigate the dynamic patterns of leaf ABA levels, plant hydraulic conductance and the point of failure in the soil-plant conductance in the highly embolism-resistant species Callitris tuberculata using continuous dendrometer measurements of leaf water potential during drought. We show that decreases in transpiration and ABA biosynthesis begin before any permanent decreases in predawn water potential, collapse in soil-plant hydraulic pathway and xylem embolism spread. We find that a dynamic but recoverable increases in hydraulic resistance in the soil in close proximity to the roots is the most likely driver of declines in midday leaf water potential needed for ABA biosynthesis and the onset of decreases in transpiration.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Suelo / Agua / Ácido Abscísico / Transpiración de Plantas / Estomas de Plantas / Sequías Idioma: En Revista: New Phytol Asunto de la revista: BOTANICA Año: 2024 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Reino Unido
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Suelo / Agua / Ácido Abscísico / Transpiración de Plantas / Estomas de Plantas / Sequías Idioma: En Revista: New Phytol Asunto de la revista: BOTANICA Año: 2024 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Reino Unido