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Monosomic analysis was conducted to determine chromosomal locations of three new leaf rust resistance genes recently transferred to common wheat (Triticum aestivum) from T. monococcum. The resistance gene in wheat germplasm line KS92WGRC23 was transferred from T. monococcum ssp. monococcum. The resistance genes found in KS93U3 and KS96WGRC34 were transferred from T. monococcum ssp. aegilopoides. Allelism...
In crosses of B. napus × C. abyssinica and B. campestris × C. abyssinica, pre-fertilization incompatibility was observed. In crosses of B. juncea × C. abyssinica, pollen grains of C. abyssinica were compatible to the stigmas of all the B. juncea pistils, the pollen tube growth was normal and the pollen tube reached the micropyle in 3–4 days after pollination. Through comparative studies on embryo...
Seed samples of seventeen field pea cultivars grown at five locations, and nine grass pea lines grown at two locations, in western Canada during 1993 and 1994 were analysed for total phenolics and condensed tannins. Each location in each year was considered as one environment. Total phenolics in field pea differed significantly among cultivars, ranging from 162 mg/kg DM (dry matter) (CE, catechin...
Interspecific hybrid plants between Melilotus altissima (yellow flowers) and either M. alba (white flowers) or M. taurica (white flowers) and between M. suaveolens (yellow flowers) and M. wolgica (white flowers) which were inviable because of heavy chlorosis, were grown successfully by in vitro culture and reached the flowering stage. Pollen fertility of hybrid plants between M. altissima and M. alba...
Bunch orientation is an economically important trait in plantain (Musa spp. AAB group) and banana (Musa spp. AAA or ABB groups). Pendulous bunches are more symmetrical than subhorizontal, horizontal, or erect bunches and are, therefore, better adapted for transportation. Erect, horizontal, subhorizontal, and pendulous bunches were observed in segregating populations derived from crosses between plantains...
A study of the genetic diversity in coconut by RFLP analysis was performed in 100 individuals representing 10 Tall and seven Dwarf local populations or 'ecotypes' from various geographical origins. Nine cDNA clones from rice, one mitochondrial DNA clone (CoxI) and one genomic clone (rDNA) from wheat were used as probe for southern hybridization. The distribution of the 40 polymorphic bands revealed...
Substitution lines with reciprocal substitutions of chromosomes containing recessive alleles of the homoeologous group 5 chromosomeVrn genes between varieties of winter wheat with high vernalisation requirement (‘Mironovskaya 808’) and low vernalisation requirements (‘Bezostaya 1’) have been created. On this basis the genetic determination of vernalisation requirement was established. Substitution...
ISSR-PCR was carried out on 12 accessions of the grapevine (Vitis vinifera L.) variety 'Garnacha' and one accession of a related variety. The analysis had two objectives: to determine if ISSR-PCR could detect polymorphisms within a variety unable to be revealed previously with RAPDs, and to quantify the intralaboratory reproducibility of the assay. Two electrophoretic systems and staining procedures...
The embryo and seedling growth patterns of two Triticum polyploid species, namely the tetraploid, T. durum (AABB), and the hexaploid, T. aestivum (AABBDD), were compared. Two developmental phases were identified, an initial lag phase during embryo growth and an exponential phase during seedling growth. These developmental phases were distinctly different in the two species. The initiation of mitosis...
Alginate-coated meristems from in vitro-grown strawberry (Fragaria × ananassa Duch.) were successfully cryopreserved following dehydration by a vitrification solution. Excised meristems from cold-hardened plantlets at 4 °C for two weeks in the dark were encapsulated into alginate-gel beads containing a mixture of 2 M glycerol plus 0.4 M sucrose. These encapsulated and cryoprotected meristems were...
The dioecious genus Actinidia includes the kiwifruit, A. deliciosa. Currently, the kiwifruit industry is based predominantly on a single female cultivar, 'Hayward', with up to 13% of the orchard canopy in commercial blocks in New Zealand consisting of unfruitful males vines, necessary as pollinizers. The development of hermaphrodite cultivars became a possibility with the identification of inconstant...
Chromosome 5A of wheat carries several major genes of agronomic importance, including Vrn1 controlling spring/winter wheat difference, Q determining spike morphology and B1 inhibiting awn development. A population of single-chromosome recombinant lines from the cross between two chromosome substitution lines, 'Chinese Spring' (Cappelle-Desprez 5A) and 'Chinese Spring' (Triticum spelta 5A) was developed...
A polymerase chain reaction (PCR)-based co-dominant marker was developed which is tightly linked to Tm22. This dominant locus confers resistance to ToMV in tomato. Random-amplified-polymorphic DNA (RAPD) screening was carried out with DNA from ToMV-susceptible and resistant tomato near-isogenic lines. A polymorphic band linked to ToMV resistance was observed. The polymorphic fragment was cloned and...
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