By Melvyn F. Askew (auth.), Gad Loebenstein, Philip H. Berger, Alan A. Brunt, Roger H. Lawson (eds.)
Potatoes, an immense vegetatively-propagated crop, has been heavily associated with plant virus examine over the past eight a long time simply because, with no their potent regulate potato viruses may cause substantial losses of crop caliber and yield. Such study has ended in marked advances in analysis, from rather basic organic and serological exams to electron microscopy, refined serological strategies and, extra lately, using polymerase chain response (PCR) and nucleic acid hybridization equipment. linked tissue tradition examine in past times 40 years or so has led to the profitable construction of virus-free crops from potato cultivars that have been completely contaminated. however, in lots of nations the excessive prevalence of virus an infection nonetheless reasons huge yield losses. as a result of their significance, potato viruses have additionally lengthy been very important topics for learn; a lot is hence referred to now approximately their intrinsic organic and physico-chemical houses, genomes, gene services, virus-vector relationships (including particular websites of interplay among viral coat protein and the vector) and their capability as autos for transformation.
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Extra resources for Virus and Virus-like Diseases of Potatoes and Production of Seed-Potatoes
Sample text
1. Economic Importance if the Potato. 7 As reported earlier potato yields have increased over time. Initially, in the period post World War II, improvements in agronomy, allied to the introduction of good quality inorganic fertilisers and crop protection products, gave considerable enhancement of yield. Thereafter, improved understanding of irrigation and improved machinery brought higher absolute and exploitable yields. e. production without use of synthetic materials) the trend is more likely to be towards fewer but more specialist growers with close focus on market specifications.
Yet, a number of related species that lack stolons and tubers have been included in this taxon due to other morphological traits. The latter are included in the series Juglandifolia and Etuberosa. 3 Cytology With a base number of 12, most of the members of the Petota section are diploids, about 15% are tetraploids and the remaining 12% are tri-, penta- or hexaploids. All the diploids studied so far have shown regular pairing of homologous chromosomes at meiosis, and there are good indications that homologous chromosomes in polyploids also occur.
Yes No reliable information WhyMT? Reducing cost Improving quality concerning - virus diseases - fungal diseases bacterial diseases - %of Countries (rounded figures) 0 5 45 50 90 0 60 75 55 45 30 20 35 25 40 40 60 20 65 20 60 It is well proven that total biological yield of potato is a function of water availability, intercepted photosynthetically active radiation and the general nutrition and pest/pathogen complexes. Hence, comparing production or yield on an annual basis is likely to be misleading; longer term averages provide a more apt assessment.