Development anatomy in wheat of male sterility induced by heat stress, water deficit or abscisic acid

Saini, H.S.; Sedgley, M.; Aspinall, D.

Australian Journal of Plant Physiology 11(4): 243-253


ISSN/ISBN: 0310-7841
DOI: 10.1071/pp9840243
Accession: 001333873

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Male sterility was induced in plants of wheat cv. Gabo by heat stress (30 degrees C for 3 days), water stress (leaf water potential of -2.54 MPa) or exogenous application of 3 x 10-5 M ABA. 3 developmental sequences leading to sterility were identified. These were premature tapetal degeneration resulting in periplasmodial invasion of the locule at meiosis, as seen in the response to heat stress and ABA; loss of contact of the microspores with the tapetum at first pollen grain meiosis (PGM 1), as seen in response to water stresses; and a sequence in which the microspores completed PGM 1 but some became disorientated from the tapetum and developed no further, leading to a form of partial sterility seen in response to all 3 stresses. Each stress treatment resulted in 2 groups of abnormal anther locules, one completely sterile and the other partially sterile. It was concluded that ABA may not be the single agent controlling sterility induced by water stress, and that the same or different mechanisms may cause male sterility in response to the 3 treatments.