Section 7
Chapter 6,479

Sterility in wheat triticum aestivum cultivar gabo induced by water deficit or high temperature possible mediation by abscisic acid

Saini, H.S.; Aspinall, D.

Australian Journal of Plant Physiology 9(5): 529-538


ISSN/ISBN: 0310-7841
Accession: 006478566

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The application of an abscisic acid [ABA] solution to developing spikes of wheat (cv. Gabo) via wicks threaded through peduncles at the stage of meiosis in pollen mother cells caused pollen sterility without affecting female fertility. The concentration of ABA measured in the spikelets of plants treated in this manner was close to that induced by water stress, which produced a similar level of pollen sterility. After pollen mother cell [PMC] meiosis, treatment with ABA had no effect on pollen fertility, as was shown previously with water stress. ABA applied immediately before meiosis reduced fertility, in contrast to the effect of water stress, but this may have been due to persistence of the hormone in the plant. High temperature during PMC meiosis had no effect on the endogenous ABA content of the spikelets, even when the treatment caused a complete inhibition of grain set.

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