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Embolized Stems Recover Overnight in Zea mays: The Role of Soil Water, Root Pressure, and Nighttime Transpiration #MMPMID28503183
Gleason SM; Wiggans DR; Bliss CA; Young JS; Cooper M; Willi KR; Comas LH
Front Plant Sci 2017[]; 8 (ä): ä PMID28503183show ga
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 (?xylem ?-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: ?soil ? 0 MPa, ?soil ?-0.40 MPa, and ?soil ?-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 (?soil ? 0 MPa) overnight allowed for the significant recovery of KS (76% of maximal), whereas partial watering (?soil ?-0.40 MPa) resulted KS values that were 51.7% of maximal values, whereas not watering resulted in no recovery (35.4% of maximal; ?soil ?-1.7 MPa). Recovery of KS was facilitated by the generation of root pressure and low rates of nighttime transpiration.