首页|Improved photosynthetic water-use efficiency of potato due to partial stomatal closure induced by ABA signalling at mild soil water deficits
Improved photosynthetic water-use efficiency of potato due to partial stomatal closure induced by ABA signalling at mild soil water deficits
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Potted potatoes (Solanum tuberosum L。) were grown in a climate-controlled glasshouse to investigate leaf gas-exchange characteristics during progressive soil drying。 Stomatal conductance (g_s)， light-saturated photosynthesis (A)， leaf water potential (Ψ_1)， and xylem sap ABA concentration ([ABA]_(xylem)) were determined in well watered (WW) and drought-stressed (DS) plants。 During soil drying g_s decreased linearly with increasing [ABA]_(xylem) when there was no detectable decrease in Ψ_1; A/g_s increased linearly with decreasing g_s until the latter reached 0。2 mol m~(-2) s~(-1); below this point， it decreased sharply。 It is concluded that during mild soil water deficits， g_s of potato is controlled by xylem-borne ABA。 As a consequence of A being less sensitive to soil drying than g_s is， A/g_s increased at mild soil water deficits。
abscisic aciddrought stressgas exchangephotosynthetic water use efficiencysolanum tuberosum L.
F. Liu、M.N. Andersen、A. Shahnazari、S.E. Jacobsen、C.R. Jensen
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The Royal Veterinary and Agricultural University, Department of Agricultural Sciences, Laboratory for Agrohydrology and Bioclimatology, Heojbakkegaard Alle 13, DK-2630 Taastrup, Denmark
International Plant Nutrition Colloquium
Beijing
Plant Nutrition for Food Security, Human Health and Environmental Protection
NETL
