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In breeding for resistance to rhizomania, breeding material was routinely examined for resistance to the rhizomania virus over several years. This study was performed in order to investigate the value of virological examination of sugarbeet breeding material in breeding for resistance to the rhizomania virus. Tests were conducted with varieties susceptible or partially resistant to rhizomania, as well as with several new and more-resistant hybrids. A test on young plants showed that all genotypes contained beet necrotic yellow-vein virus (BNYVV), but that the virus content differed widely. Plants of two commercially used partially resistant varieties had, on average, only half the virus content of susceptible varieties in their roots, and plants of eight new hybrids still in the process of registration contained less than one third of that amount. There was a significant negative correlation between the quantity of BNYVV in young plant roots and final yield under disease conditions in the field. Opportunities for further improvement in the level of the resistance to BNYVV in sugarbeet by means of conventional breeding programmes are discussed. 相似文献
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R. Amiri M. Moghaddam M. Mesbah S. Yaghoub Sadeghian M.R. Ghannadha K. Izadpanah 《Euphytica》2003,132(3):363-373
In this study, the inheritance of resistance to Beet necrotic yellow vein virus (BNYVV) in accessions Holly-1-4and WB42 was investigated. Crosses between both resistant sources and susceptible parents
were carried out and F1F2 and BC1 populations were obtained. Virus concentrations in WB42and its F1 populations were lower than in Holly-1-4. Observed ratios of susceptible and resistant plants in segregating populations
of Holly-1-4 as well as WB42 were in agreement with hypothesis of one dominant major gene. Segregation of plants in F2 populations obtained from crosses betweenHolly-1-4 and WB42 revealed that the resistance genes in Holly-1-4 and WB42 were
nonallelic and linked loci.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
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通过比较生理学研究表明,丛根病病毒侵染甜菜后引起了体内氨基酸总量及各种氨基酸代谢的改变。以无病地为对照,病地上各品种叶丛和根中总氨基酸量及各氨基酸相对含量较高;抗病品种较感病品种块根和叶丛中均有相对较高的ASP、SER、GLY、VAL、LYS、PRO,其中PRO增加明显,故这些氨基酸特别是PRO累积量可以作为病地选育的生理指标。病地较无病地上的各品种具有较强的氨基酸代谢,以及相对较多的氨基酸参与到植株抗病中去。 相似文献
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Ryo Nakagami Sotaro Chiba Naoto Yoshida Yoshiteru Senoo Minako Iketani-Saito Satoru Iketani Hideki Kondo Tetsuo Tamada 《Plant pathology》2022,71(3):715-728
Beet necrotic yellow vein virus (BNYVV) is the causal agent of rhizomania, the most serious sugar beet disease worldwide. Since the first finding in Japan in 1969, BNYVV became widespread throughout Hokkaido in a few decades and led to the introduction of Rz1-resistant sugar beet cultivars in the 1990s. Here, we report the historical progress of the BNYVV epidemic in Hokkaido from 1969 to 2019. Previous analysis on samples from 1991 showed that BNYVV isolates were classified into three strains (named O, D, and T) based on the RNA3-encoded p25 gene. The O-type viruses were widely detected in Hokkaido, while the D- and T-type viruses were detected in limited areas. The RNA5, encoding the p26 gene, was initially contained in some D- and O-type isolates but not in any T-type isolates. Interestingly, recent sample analysis revealed that RNA5-containing T-type viruses, seemingly more virulent than the other two strains, were widely detected in Hokkaido. Additionally, a small group of virus isolates harbouring a new p25 gene (named C) was found in limited areas. These results suggest that the T-type viruses, which accompanied RNA5, have been preferentially spread from a limited area to other districts over the last few decades and that this spread might be strongly associated with the recent introduction of Rz1-resistant sugar beet cultivars. BNYVV-positive samples also contained mainly beet soil-borne virus and traces of beet virus Q, both of which are the first to be recorded in Japan. 相似文献
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