Embolized Stems Recover Overnight in Zea mays: The Role of Soil Water, Root Pressure, and Nighttime Transpiration
| Autor: | Clayton A. Bliss, Jason S. Young, Katie R. Willi, Louise H. Comas, Mitchell Cooper, Sean M. Gleason, Dustin R. Wiggans |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
0301 basic medicine Irrigation embolism recovery Plant Science lcsh:Plant culture xylem micro-CT 01 natural sciences embolism Field capacity 03 medical and health sciences Hydraulic conductivity Root pressure Botany lcsh:SB1-1110 Original Research Transpiration Chemistry Water stress Xylem plant hydraulics Horticulture 030104 developmental biology Soil water hydraulic conductivity 010606 plant biology & botany |
| Zdroj: | Frontiers in Plant Science, Vol 8 (2017) Frontiers in Plant Science |
| ISSN: | 1664-462X |
| DOI: | 10.3389/fpls.2017.00662 |
| Popis: | It is not currently well-understood how much xylem conductance is lost in maize plants during the day, if conductance is recovered during the night, or what soil water conditions are required for recovery to take place. To answer these questions we designed a greenhouse experiment whereby two genetically dissimilar maize genotypes were subjected to a level of water stress commonly experienced in the field (Ψxylem ∼-2 MPa). We then measured the loss of stem-specific conductivity associated with this level of stress, as well as the overnight recovery following three re-watering treatments: Ψsoil ∼ 0 MPa, Ψsoil ∼-0.40 MPa, and Ψsoil ∼-1.70 MPa. Mid-day leaf water potentials of -1.98 MPa resulted in stem-specific conductivity (KS) values that were 31.5% of maximal (i.e., 68% loss). Returning soils to field capacity (Ψsoil ∼ 0 MPa) overnight allowed for the significant recovery of KS (76% of maximal), whereas partial watering (Ψsoil ∼-0.40 MPa) resulted KS values that were 51.7% of maximal values, whereas not watering resulted in no recovery (35.4% of maximal; Ψsoil ∼-1.7 MPa). Recovery of KS was facilitated by the generation of root pressure and low rates of nighttime transpiration. |
| Databáze: | OpenAIRE |
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