Characterization of spring wheat triticum aestivum genotypes differing in drought induced abscisic acid accumulation 1. drought stressed abscisic acid production

Quarrie, S.A.; Lister, P.G.

Journal of Experimental Botany 34(147): 1260-1270


ISSN/ISBN: 0022-0957
Accession: 004931814

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Abscisic acid (ABA) accumulation in response to drought stress was studied in F5 and F6 progeny of a cross between 2 spring wheat genotypes contrasting in ABA accumulation: TW269/9 (high ABA) and Highbury (low ABA). Selection in earlier generations was made on the basis of ABA accumulation in detached and partially dehydrated samples of the 4th leaf of the main stem (MSLA). Detached-leaf tests with MSL4 from several low and high ABA selections at F5 confirmed differences found in ABA accumulation in the F4 generation. Approximately 2-fold differences were maintained at F5 in both cabinet-grown and field-grown plants. Measurements of the ABA concentrations present in flag leaves taken from drought-stressed plants in the field gave variable results. Several selections at F5 which differed in ABA content by .apprx. 70% in detached-leaf tests with MSL4, contained the same concentration of ABA in both low and high ABA selections as plants became water-stressed. Low and high ABA F6 selections which were sampled on 5 occasions over several weeks differed consistently in the level of ABA present for a particular degree of water stress. The ABA selections contained .apprx. 50% more ABA than low ABA selections. Possible explanations are given for the inconsistencies between ABA levels from low and high ABA selections in detached-leaf and attached-leaf tests.