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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
(?): 662
PMID28503183
show 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 (K(S)) 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 K(S) (76% of maximal), whereas partial watering
(?(soil) ?-0.40 MPa) resulted K(S) 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 K(S) was facilitated by the generation of root pressure and low
rates of nighttime transpiration.
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