Sterility in wheat (Triticum aestivum L.) induced by water deficit or high temperature: possible mediation by abscisic acid

Saini, H.S.; Aspinall, D.

Australian Journal of Plant Physiology 9(5): 529-537


ISSN/ISBN: 0310-7841
DOI: 10.1071/pp9820529
Accession: 001127502

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Application of ABA to developing ears 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. ABA conc. measured in the spikelets of plants treated in this way was close to that induced by water stress which produced a similar level of pollen sterility. After pollen mother cell meiosis, treatment with ABA had no effect on pollen fertility. In contrast to the effect of water stress, ABA applied immediately before meiosis reduced fertility but this may have been due to persistence of the hormone in the plant. High temp. during pollen mother cell meiosis had no effect on the endogenous ABA content of the spikelets even where the treatment caused a complete inhibition of grain set.