Effect of soil compaction on barley (Hordeum vulgare L.) growth

The abscisic acid (ABA)-deficient mutant of barley, Az34, exhibited a much reduced rate of leaf expansion at a bulk density of 1.6 g cm−3 as compared to the isogenic wild-type variety, Steptoe. Az34 had a consistently lower xylem sap ABA concentration at 7 d and 14 d after emergence (DAE). The xylem...

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Veröffentlicht in:Journal of experimental botany 1996-04, Vol.47 (4), p.551-556
Hauptverfasser: Mulholland, B.J., Taylor, I.B., Black, C.R., Roberts, J.A.
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container_end_page 556
container_issue 4
container_start_page 551
container_title Journal of experimental botany
container_volume 47
creator Mulholland, B.J.
Taylor, I.B.
Black, C.R.
Roberts, J.A.
description The abscisic acid (ABA)-deficient mutant of barley, Az34, exhibited a much reduced rate of leaf expansion at a bulk density of 1.6 g cm−3 as compared to the isogenic wild-type variety, Steptoe. Az34 had a consistently lower xylem sap ABA concentration at 7 d and 14 d after emergence (DAE). The xylem sap data suggest that ABA present at Steptoe concentrations may have a direct role in maintaining leaf expansion at the sub-critical bulk density (1.6 g cm−3 To test this hypothesis, addition of synthetic ABA either to the rooting environment (100 nM) or directly to the xylem sap (5 pg μl−1 to reproduce the xylem sap ABA concentrations found in Steptoe, increased leaf expansion in Az34 to the wild-type level. Furthermore, feeding Steptoe xylem sap to Az34 produced similar effects. These experiments provide direct evidence of a positive role for ABA as a root-to-shoot signal which assists in maintaining leaf growth in plants experiencing subcritical levels of compaction stress.
doi_str_mv 10.1093/jxb/47.4.551
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Az34 had a consistently lower xylem sap ABA concentration at 7 d and 14 d after emergence (DAE). The xylem sap data suggest that ABA present at Steptoe concentrations may have a direct role in maintaining leaf expansion at the sub-critical bulk density (1.6 g cm−3 To test this hypothesis, addition of synthetic ABA either to the rooting environment (100 nM) or directly to the xylem sap (5 pg μl−1 to reproduce the xylem sap ABA concentrations found in Steptoe, increased leaf expansion in Az34 to the wild-type level. Furthermore, feeding Steptoe xylem sap to Az34 produced similar effects. 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source JSTOR Archive Collection A-Z Listing; Oxford University Press Journals All Titles (1996-Current); EZB-FREE-00999 freely available EZB journals; Alma/SFX Local Collection
subjects ABA
ABA-deficient mutant
leaf expansion
xylem sap
title Effect of soil compaction on barley (Hordeum vulgare L.) growth
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