Heterosis in lucerne testcrosses with Medicago arborea introgressions and Omani landraces and their performance in synthetics

Irwin, J. A. G., Armour, D. J., Pepper, P. M. and Lowe, K. F. (2010) Heterosis in lucerne testcrosses with Medicago arborea introgressions and Omani landraces and their performance in synthetics. Crop and Pasture Science, 61 6: 450-463. doi:10.1071/CP10070


Author Irwin, J. A. G.
Armour, D. J.
Pepper, P. M.
Lowe, K. F.
Title Heterosis in lucerne testcrosses with Medicago arborea introgressions and Omani landraces and their performance in synthetics
Formatted title
Heterosis in lucerne testcrosses with Medicago arborea introgressions and Omani landraces and their performance in synthetics
Journal name Crop and Pasture Science   Check publisher's open access policy
ISSN 1836-0947
1836-5795
Publication date 2010-06-01
Year available 2010
Sub-type Article (original research)
DOI 10.1071/CP10070
Volume 61
Issue 6
Start page 450
End page 463
Total pages 14
Editor John Irwin
Place of publication Melbourne, Australia
Publisher CSIRO
Collection year 2011
Language eng
Subject C1
830402 Lucerne
070305 Crop and Pasture Improvement (Selection and Breeding)
Formatted abstract
Testcrosses were made with novel sources of lucerne germplasm. These were evaluated in the field in a subtropical environment to identify the lines which produced the highest yielding hybrids as a guide to future breeding efforts. The novel sources were derivatives of Medicago sativa × M. arborea partial (asymmetric) hybrids (termed sac) and very highly winter-active Omani landraces of M. sativa. As testers, 2 lines were used; a Colletotrichum trifolii race 2 resistant selection from the group 9 Australian-bred and adapted cultivar PacL 901 (selection hereafter termed 901) and the Omani landrace, Oman 2, collected at 17°N latitude, from Salalah, Oman. In the row experiment, substantial and significantly positive tester parent heterosis for overall yield (sum of 13 harvests) was observed in all of the sac × Oman 2 testcrosses, with the mean performance of the 11 testcrosses (1839 g/m row) significantly (P < 0.05) exceeding the mean performance of the sac × 901 testcrosses (1703 g/m row) evaluated. Where 901 was used as the tester, heterosis values relative to the tester for the same sac lines were negative for all testcrosses with 8 of the testcrosses being significantly negative. For the Omani landrace × 901 testcrosses, positive and negative heterosis values for total yield relative to the tester were observed, but none were significantly different from zero. The 901 tester yielded significantly (P < 0.05) more per se than the Oman 2 tester (1956 v. 1470 g/m row), although in an adjacent sward experiment Oman 2 yielded comparably to most of the standard commercial cultivars.
© CSIRO 2010.

Keyword Alfalfa
Arborea x sativa
Heterosis
Omani landraces
Genetic improvement
Tetraploid alfalfa
Uunited States
Forage yield
Sativa
Resistance
Germplasm
Markers
Hybrids
Inheritance
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2011 Collection
School of Biological Sciences Publications
 
Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 4 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 4 times in Scopus Article | Citations
Google Scholar Search Google Scholar
Created: Sun, 13 Jun 2010, 10:07:13 EST