The relationship between leaf growth and ABA accumulation in the grass leaf elongation zone.

Dodd, I. C. and Davies, William J. (1996) The relationship between leaf growth and ABA accumulation in the grass leaf elongation zone. Plant, Cell and Environment, 19 (9). pp. 1047-1056. ISSN 0140-7791

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Abstract

Detached barley (Hordeum vulgare L.) shoots, maintained at different air temperatures and VPDs, were fed ABA via the sub-crown internode in a leaf elongation assay. Analysis of variance of leaf elongation rate (LER) showed significant effects of temperature (T), fed [ABA] and the interaction T × [ABA]. However, the interaction became non-significant when LER was modelled against the [ABA] of the elongation zone, [EZ-ABA] When detached barley shoots were fed sap from droughted maize (Zea mays L.) plants, sap [ABA] could not explain the growth inhibitory activity. Measurement of [EZ-ABA] accounted for this 'unexplained' growth inhibition. The detached shoot experiments indicated that [EZ-ABA], and not xylem sap [ABA], was an appropriate explanatory variable to measure in droughted plants. However, ABA accumulation in the elongation zone could not explain a 35% growth reduction in intact droughted plants; thus we considered an interaction of water status and ABA. Using a coleoptile growth assay, we applied mild osmotic stresses (ψ=0 to −0.06 MPa) and 10−4 mol m−3 ABA. Individually, these treatments did not inhibit growth. However, osmotic stress and ABA applied together significantly reduced growth. This interaction may be an important mechanism in explaining leaf growth inhibition of droughted plants.

Item Type:
Journal Article
Journal or Publication Title:
Plant, Cell and Environment
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1100/1110
Subjects:
?? gramineae • abscisic acid • elongation zone • leaf growth • soil drying • temperatureplant sciencephysiologyge environmental sciences ??
ID Code:
22026
Deposited By:
Deposited On:
18 Feb 2009 10:03
Refereed?:
Yes
Published?:
Published
Last Modified:
15 Jul 2024 10:03