منابع مشابه
Haploids and Doubled Haploids in Plant Breeding
Haploids are plants (sporophytes) that contain a gametic chromosome number (n). They can originate spontaneously in nature or as a result of various induction techniques. Spontaneous development of haploid plants has been known since 1922, when Blakeslee first described this phenomenon in Datura stramonium (Blakeslee et al., 1922); this was subsequently followed by similar reports in tobacco (N...
متن کاملDoubled Haploids versus Conventional Breeding in CIMMYT Wheat Breeding Programs
Doubled haploid (DH) technology has been used in breeding programs for several decades and is currently the method of choice in a number of crop species, including barley (Hordeum vulgare L.), rapeseed (Brassica napus L.), maize (Zea mays L.), and wheat (Triticum aestivum L.). In this study we investigated via computer simulation the benefit of using DHs compared with the conventional wheat bre...
متن کاملThe Use of Doubled-haploids in Cassava Breeding
Cassava breeding is difficult and, compared with other crops, inefficient. The problems in cassava breeding relate to the length of the breeding cycle, the large genetic load present in the crop, and the heterozygous nature of the parents and progenies evaluated. The production of doubled haploids, through tissue culture techniques, offers interesting advantages. By definition, any process that...
متن کاملBiochemical and Molecular Genetics in Breeding for Quality in Barley
To this day plant breeding is most successfully carried out emperically by crossing promising lines and by selecting high yielding plants with improved quality. Biochemical genetics provides increasing possibilities to determine the metabolic pathways leading to storage proteins, enzymes, flavonoids and fatty acids, compounds which give favourable or unfavourable quality characteristics to the ...
متن کاملAssessment of the value of doubled haploids as progenitors in cocoa (Theobroma cacao L.) breeding.
In order to evaluate twelve doubled haploids (DHs) of Theobroma cacao L. used as parents, a trial was set up in Côte d'Ivoire. Several traits were observed, such as yield, vigour, yield/vigour ratios, resistance to the black pod disease caused by Phytophthora, percentage of flat beans and mean weight of 100 cocoa beans. Out of the three progenies derived from crosses between two DHs, two showed...
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ژورنال
عنوان ژورنال: South African Journal of Plant and Soil
سال: 1988
ISSN: 0257-1862,2167-034X
DOI: 10.1080/02571862.1988.10634278