New Zealand Journal of
Agricultural Research abstracts
Breeding for disease
resistance, forage, and seed production in Lotononis
bainesii Baker
D. Real*
Forage Legume Department
National Institute of Agricultural Research
INIA Tacuarembó
Ruta 5 km 386
Tacuarembó
Uruguay
N. Altier
Phytopathology Department
National Institute of Agricultural Research
INIA Las Brujas
Ruta 48 km 10
Canelones, Uruguay
*Present address: CRC for
Plant-Based Management of Dryland
Salinity, University Field Station,
The
University of Western Australia, 1 Underwood Avenue, Shenton Park,
Western Australia 6009, Australia.
Email:
dreal@cyllene.uwa.edu.au
Abstract In
1999, INIA Uruguay initiated a plant
breeding program on Lotononis
bainesii Baker, a subtropical
forage legume from Southern Africa. Seeds from nine different
geographical origins were grown and subsequently hand-crossed. Ninety
crosses were generated and their variability was used to improve
disease resistance, and forage and seed yield. Fusarium
oxysporum,
a fungal pathogen responsible for crown and stolon rot, is common in
Uruguayan soils and the only public cultivar available is reported to
be susceptible to this pathogen. In winter 2001, a seedling screening
method was used that allowed seeds to grow in Petri plates in the
presence of the fungus. The resistant plants of each of the 90 crosses
were transplanted into trays in a naturally lit glasshouse and
subsequently divided into three sets with equal representation. Two of
them were transplanted as spaced plant nurseries into each of two sites
with distinct soil types in the basaltic region of Uruguay. The third
set was transplanted into 10-litre pots to select for seed production.
The best 17 crosses were selected based on their performance in forage
and seed yield evaluations. In this paper we present the breeding
methodology used in developing the cultivar ‘INIA Glencoe’ with
improved disease resistance and improved forage and seed production.
Preliminary tests conducted in 2003 to compare the new cultivar (‘INIA
Glencoe’) with the public one (‘Miles’) demonstrated that ‘INIA
Glencoe’ has superior disease resistance as well as enhanced forage and
seed yield.
Keywords Lotononis
bainesii Baker; Fusarium
oxysporum; disease resistance;
forage production; seed production
A04004; Received 22 January
2004; accepted 13 July 2004; Online
publication date 21 March 2005
New Zealand Journal of
Agricultural Research, 2005, Vol. 48:
93–100
0028–8233/05/4801–0093 © The Royal Society of New Zealand 2005
PDF file of entire paper: Print-quality
(270K) | screen-quality
(299K)
This year's abstracts
|
Journal
home page |
All abstracts
|
Publishing
home page
