Articles
GENERATING AND DELIVERING NOVELTY IN ORNAMENTAL CROPS THROUGH INTERSPECIFIC HYBRIDISATION: SOME EXAMPLES
Article number
836_13
Pages
97 – 103
Language
English
Abstract
The generation of novelty is a key focus for breeders of ornamental crops.
This paper reviews outcomes of the application of in vitro breeding techniques to generate novel genetic combinations from which new varieties can be selected in a range of genera.
Interspecific hybridisation between Limonium sinuatum and L. perezii resulted in range of hybrids and back-cross hybrids.
All F1 hybrids were sterile and through oryzalin-induced chromosome doubling fertility was restored.
The tetraploid forms of the interspecific hybrids were used to generate back-cross hybrids with a low level of fertility. Sandersonia is a flower crop well known to New Zealand growers.
Very little variation has been observed despite the crop being entirely seed propagated.
Attempts to increase variation in this crop have included hybridisation with Littonia and Gloriosa. There are considerable differences in the growth and agronomic performance of the various Sandersonia hybrids, with some lines almost impossible to grow and others extremely vigorous.
Hybrids have all been infertile and attempts to double chromosomes have not been successful in any of the lines tested. Gentiana is a relatively poorly known cut flower crop.
Ten years ago the colour range was blue, pink and white.
Red-flowered varieties are now available to commerce.
Yellow-flowered interspecific hybrids have been developed between G. triflora and G. lutea. These hybrids have proven difficult to grow out of in vitro culture.
Chromosome doubling has been carried out to overcome the anticipated infertility of these hybrids, and work is underway to develop a strategy for producing back-cross hybrids.
This paper reviews outcomes of the application of in vitro breeding techniques to generate novel genetic combinations from which new varieties can be selected in a range of genera.
Interspecific hybridisation between Limonium sinuatum and L. perezii resulted in range of hybrids and back-cross hybrids.
All F1 hybrids were sterile and through oryzalin-induced chromosome doubling fertility was restored.
The tetraploid forms of the interspecific hybrids were used to generate back-cross hybrids with a low level of fertility. Sandersonia is a flower crop well known to New Zealand growers.
Very little variation has been observed despite the crop being entirely seed propagated.
Attempts to increase variation in this crop have included hybridisation with Littonia and Gloriosa. There are considerable differences in the growth and agronomic performance of the various Sandersonia hybrids, with some lines almost impossible to grow and others extremely vigorous.
Hybrids have all been infertile and attempts to double chromosomes have not been successful in any of the lines tested. Gentiana is a relatively poorly known cut flower crop.
Ten years ago the colour range was blue, pink and white.
Red-flowered varieties are now available to commerce.
Yellow-flowered interspecific hybrids have been developed between G. triflora and G. lutea. These hybrids have proven difficult to grow out of in vitro culture.
Chromosome doubling has been carried out to overcome the anticipated infertility of these hybrids, and work is underway to develop a strategy for producing back-cross hybrids.
Publication
Authors
E.R. Morgan, G.K. Burge, G. Timmerman-Vaughan, J.E. Grant
Keywords
Limonium sinuatum, L. perezii, Gentiana lutea, G. triflora, Sandersonia aurantiaca, Littonia modesta, Gloriosa, interspecific hybrid, polyploid
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