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Annals of Botany 88: 947-952, 2001
© 2001 Annals of Botany Company

COMMUNICATION

Photoperiod and Vernalization Responses in Triticum turgidum x T. tauschii Synthetic Hexaploid Wheats

N. N. Gororo+, R. G. Flood, R. F. Eastwood and H. A. Eagles

Joint Centre for Crop Improvement, Institute of Land and Food Resources, The University of Melbourne, Private Bag 260, Horsham, Vic., 3401, Australia CRC for Molecular Plant Breeding, Victorian Institute for Dryland Agriculture, Private Bag 260, Horsham, Vic., 3401, Australia Natural Resources and Environment-Horsham, Victorian Institute for Dryland Agriculture, Private Bag 260, Horsham, Vic., 3401, Australia

Received: 16 February 2001 ; Returned for revision: 14 May 2001 . Accepted: 18 July 2001

ABSTRACT

Studies of synthetic hexaploid wheat developed from Triticum turgidum(AABB genomes) and T. tauschii(DD genome) can provide information on potentially useful characters in T. tauschii and/or T. turgidum for genetic improvement of hexaploid wheat (T. aestivum). Synthetic hexaploid wheats and the T. turgidum and T. tauschii parents were assessed for their developmental responses to photoperiod and vernalization for days to ear emergence, final leaf number and the number of spikelets per spike. The responses to photoperiod and vernalization of the synthetic hexaploids were generally intermediate between those of the parents but in some instances the levels of expression exhibited by the T. tauschii or T. turgidum parents were epistatic in the synthetic hexaploids. The relatively strong photoperiod response of the T. tauschii accessions was not expressed in the synthetic hexaploids, but rather the synthetic hexaploids reflected the photoperiod response of the respective T. turgidum parents. The synthetic hexaploids had vernalization responses stronger than those of the T. turgidum and bread wheats used in the study. The expression of ear emergence in response to vernalization of these synthetic hexaploids appeared to be modified by the T. turgidum parent. Copyright 2001 Annals of Botany Company

Photoperiod, synthetic hexaploids, Triticum aestivum, Triticum tauschii, Triticum turgidum, vernalization


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