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This work was done to quantify, evaluate and preserve the genetic variation of the olive (Olea europaea L.) from Tuscany and to look for ready-to-use valuable characters. Principal component analysis (PCA) was used to compare fruit, pit, leaf and growth habit characteristics among 83 accessions. Clustering of cultivars would suggest the existence of a strictly related genetic base with little morphological...
The relative value of haploid Tuberosum-Solanum chacoense (TCH) vs. Solanum phureja-haploid Tuberosum (PTH) hybrids as male parents in 4x–2x crosses was estimated under two distinct crop management systems. The first experiment (E#1) was carried out with supplementary irrigation (three times a week) at Hancock-Wisconsin (WI) with 27 families derived from a sub-set of crosses involving 11 tetraploid...
We investigated the genetic diversity of 42 plum varieties by RAPD analysis. Twenty primers discriminated all plum varieties excepting two synonymous pairs: 'Botankyou and ‘Kelsey’, and ‘Chairn’ and ‘Tragedy’. Two North American plums, ‘Beach Plum’ and ‘Glow’, were genetically distinct from the other plums by cluster analysis. Overlaps observed between the ‘European plum group’ and the ‘Japanese plum...
A cross was made between rice cultivars Katy and Lemont. F3 families were produced from individual F2 plants. Approximately 25 plants of each F3 family were inoculated with each of 8 different strains of Magnaporthe grisea. Each strain of the pathogen was known to have different genes for avirulence on Katy or Lemont. Each F3 family was recorded as having all plants resistant, segregating for resistance,...
Frost is one of the main climatic stresses which has to be overcome by a winter pea crop. Some forage lines show a delayed floral initiation, which helps them to escape the main winter freezing periods, as a higher susceptibility to frost is observed after floral initiation commences. Frost tolerant forage peas have been used in all winter pea breeding programs in France and our main purpose was to...
The genetic relationships among 32 white grapevine varieties (Vitis vinifera L.) grown in different French and Spanish regions were surveyed by using RAPD markers. Two hundred and eight clear and unambiguous RAPD markers were amplified by using 33 primers previously selected. Genetic relationships were established by UPGMA cluster analysis and also by studying RAPD low frequency bands. Three groups...
Hordeum chilense is resistant to common bunt. Addition lines of H. chilense in wheat were utilized in field experiments to determine which H. chilense chromosomes carry resistance genes. Resistance is conferred by gene(s) on chromosome 7 and to a minor extent by such on chromosome 6 of H. chilense. Expression of resistance was quantitative.
Resistance to many arthropods, including Liriomyza species, is known to be present in accessions of Lycopersicon hirsutum (f. typicum or f. glabratum). From the cross L. esculentum cv. Moneymaker and L. hirsutum f. glabratum G1561 100 F2 plants were screened in a no-choice test for resistance to Liriomyza trifolii. The Bulked Segregant Analysis approach was used to find Random Amplified Polymorphic...
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