Publication Date
1989
Description
F 1 hybrids between P. aquatica L. and the hexaploid (6x) race of P. arundinacea L. produce more herbage than their parents in summer and autumn in south-eastern Australia if rainfall exceeds 50 mm per month (Mc William, 1962). Both the tetraploid and hexaploid races of P. arundinacea are more tolerant of excess aluminium in acid soils than P. aquatica ; acidity is an increasing problem in the region (Culvenor et al., 1986). However neither race of P. arundinacea can survive the summer droughts characteristic of the modified Mediterranean climate. Also, the F 1 of P. aquatica with 6x P. arundinacea, though drought resistant, is sometimes unpalatable (Axelsen and Morley, 1968). The palatability of genotypes of the tetraploid race of P. arundinacea in the northern U.S.A. is correlated with the total organic base content of their herbage, and with the concentration of indolealkylamines, a major constituent of the total base fraction (Simons and Marten, 1971). Therefore, an ll.ttempt has been made to increase the palatability of hybrid phalaris by screening 6x P. arundinacea for reduced base content and making hybrids with low base P. aquatica genotypes. This paper reports the development oflow base hybrids and the assessment of their palatability, and discusses future breeding of hybrid derivatives.
Citation
Oram, R N. and Schroeder, H E., "Seasonal Changes in Palatability of Hybrids Between Phalaris aquatica and Hexaploid P. Arundinacea" (2025). IGC Proceedings (1989-2023). 28.
https://uknowledge.uky.edu/igc/1989/session3/28
Included in
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Seasonal Changes in Palatability of Hybrids Between Phalaris aquatica and Hexaploid P. Arundinacea
F 1 hybrids between P. aquatica L. and the hexaploid (6x) race of P. arundinacea L. produce more herbage than their parents in summer and autumn in south-eastern Australia if rainfall exceeds 50 mm per month (Mc William, 1962). Both the tetraploid and hexaploid races of P. arundinacea are more tolerant of excess aluminium in acid soils than P. aquatica ; acidity is an increasing problem in the region (Culvenor et al., 1986). However neither race of P. arundinacea can survive the summer droughts characteristic of the modified Mediterranean climate. Also, the F 1 of P. aquatica with 6x P. arundinacea, though drought resistant, is sometimes unpalatable (Axelsen and Morley, 1968). The palatability of genotypes of the tetraploid race of P. arundinacea in the northern U.S.A. is correlated with the total organic base content of their herbage, and with the concentration of indolealkylamines, a major constituent of the total base fraction (Simons and Marten, 1971). Therefore, an ll.ttempt has been made to increase the palatability of hybrid phalaris by screening 6x P. arundinacea for reduced base content and making hybrids with low base P. aquatica genotypes. This paper reports the development oflow base hybrids and the assessment of their palatability, and discusses future breeding of hybrid derivatives.
