BR 18-Terena: cultivar de trigo para o Brasil

Sousa, P. G.

doi:10.1590/s0100-204x2002000700019

Cited by 10 publications

(5 citation statements)

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“…BR‐18, susceptible to X. translucens pv. undulosa (Sousa, 2002), were surface sterilized in 2% (v/v) NaOCl for 5 min, rinsed in tap water, and sowed at the rate of six seeds per pot. Five days after emergence, each pot was thinned to three plants.…”

Section: Methodsmentioning

confidence: 99%

Wheat Resistance to Bacterial Leaf Streak Mediated by Silicon

Silva¹,

Rodrigues²,

Oliveira³

et al. 2010

Journal of Phytopathology

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Leaf streak, caused by Xanthomonas translucens pv. undulosa, is the major bacterial disease of wheat in Brazil and other countries worldwide. This study aimed to evaluate the effect of silicon (Si) on disease development and the biochemical mechanisms possibly involved in resistance potentialized by this element. Plants of cv. BR-18, susceptible to leaf streak, were grown in plastic pots containing Si-deficient soil amended with either calcium silicate (+Si) or calcium carbonate ()Si). The content of Si increased (P £ 0.05) by 96.5% for the +Si when compared with )Si treatment. There was no difference (P ‡ 0.05) between Si treatments for calcium content on leaf tissue, so variations in Si accounted for differences in the level of resistance to leaf streak. There was no difference (P ‡ 0.05) between Si treatments for incubation period, latent period, necrotic leaf area, and severity estimated by the software quant. However, chlorotic leaf area was reduced (P £ 0.05) by 50.2% for the +Si when compared with )Si treatment. There was no difference (P ‡ 0.05) between Si treatments for the bacteria population on leaf tissue; however, the values seemed to be somewhat lower in the +Si treatment from 4 to 8 days after inoculation (d.a.i.) on leaves from plants supplied with Si. There was no difference (P ‡ 0.05) between Si treatments for electrolyte leakage. The concentration of total soluble phenolics and lignin-thioglycolic acid (LTGA) derivatives did not show any apparent signs of increase during the course of infection and seemed to be slightly higher on plants not supplied with Si at the most advanced stages of bacterial infection. Chitinase activity was high at the most advanced stages of bacterial infection on leaves from +Si treatment and probably affected bacterial growth on leaf tissue. Peroxidase activity following bacterial infection was not increased by Si, but can be linked with the highest concentration of LTGA derivatives at 12 d.a.i. of plants supplied with Si. Polyphenoloxidase activity did not affect wheat resistance to leaf streak regarding of the Si treatments. The results clearly suggest that supplying Si to wheat plants can increase resistance to leaf streak possibly through an increase in tissue lignification and the participation of chitinases and peroxidases.

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Section: Methodsmentioning

confidence: 99%

Wheat Resistance to Bacterial Leaf Streak Mediated by Silicon

Silva¹,

Rodrigues²,

Oliveira³

et al. 2010

Journal of Phytopathology

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“…Few sources of resistance to wheat blast have been identified in Brazil until now. Amongst these sources, the Brazilian wheat cultivars BRS 229 and BR 18‐Terena have been regularly used in breeding programmes because of their higher levels of field resistance to head blast (Brunetta et al ., ; Goulart et al ., ; Goulart and Paiva, ; Sousa, ). However, these resistant cultivars have shown susceptibility in some environments, probably as a result of the emergence of new Pygt races in these areas (Urashima et al ., , ).…”

Section: Strategies For the Management Of Wheat Blastmentioning

confidence: 99%

Wheat blast: from its origins in South America to its emergence as a global threat

Ceresini

Castroagudín

Rodrigues

et al. 2018

Molecular Plant Pathology

110

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Wheat blast was first reported in Brazil in 1985. It spread rapidly across the wheat cropping areas of Brazil to become the most important biotic constraint on wheat production in the region. The alarming appearance of wheat blast in Bangladesh in 2016 greatly increased the urgency to understand this disease, including its causes and consequences. Here, we summarize the current state of knowledge of wheat blast and aim to identify the most important gaps in our understanding of the disease. We also propose a research agenda that aims to improve the management of wheat blast and limit its threat to global wheat production.

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“…In particular, BR 18-Terena displayed broad spectrum seedling resistance when inoculated with 72 blast isolates by Urashima et al [ 22 ], and also moderate resistance when inoculated with 69 isolates at the seedling stage and 27 isolates at the heading stage by Maciel et al [ 24 ]. Due to this consistent, moderate resistance, BR 18-Terena has been frequently used in Brazilian breeding programmes since its release in 1986 [ 25 ], and many Brazilian wheat cultivars contain BR 18-Terena within their pedigree [ 26 ]. However, whilst the durable resistance of BR 18-Terena has been widely utilised, the underlying genetics of this resistance are still unknown.…”

Section: Introductionmentioning

confidence: 99%

Dissecting the genetic basis of wheat blast resistance in the Brazilian wheat cultivar BR 18-Terena

et al. 2020

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Background Wheat blast, caused by Magnaporthe oryzae Triticum (MoT) pathotype, is a global threat to wheat ( Triticum aestivum L.) production. Few blast resistance ( R ) genes have been identified to date, therefore assessing potential sources of resistance in wheat is important. The Brazilian wheat cultivar BR 18-Terena is considered one of the best sources of resistance to blast and has been widely used in Brazilian breeding programmes, however the underlying genetics of this resistance are unknown. Results BR 18-Terena was used as the common parent in the development of two recombinant inbred line (RIL) F 6 populations with the Brazilian cultivars Anahuac 75 and BRS 179. Populations were phenotyped for resistance at the seedling and heading stage using the sequenced MoT isolate BR32, with transgressive segregation being observed. Genetic maps containing 1779 and 1318 markers, were produced for the Anahuac 75 × BR 18-Terena and BR 18-Terena × BRS 179 populations, respectively. Five quantitative trait loci (QTL) associated with seedling resistance, on chromosomes 2B, 4B (2 QTL), 5A and 6A, were identified, as were four QTL associated with heading stage resistance (1A, 2B, 4A and 5A). Seedling and heading stage QTL did not co-locate, despite a significant positive correlation between these traits, indicating that resistance at these developmental stages is likely to be controlled by different genes. BR 18-Terena provided the resistant allele for six QTL, at both developmental stages, with the largest phenotypic effect conferred by a QTL being 24.8% suggesting that BR 18-Terena possesses quantitative resistance. Haplotype analysis of 100 Brazilian wheat cultivars indicates that 11.0% of cultivars already possess a BR 18-Terena-like haplotype for more than one of the identified heading stage QTL. Conclusions This study suggests that BR 18-Terena possesses quantitative resistance to wheat blast, with nine QTL associated with resistance at either the seedling or heading stage being detected. Wheat blast resistance is also largely tissue-specific. Identification of durable quantitative resistances which can be combined with race-specific R gene-mediated resistance is critical to effectively control wheat blast. Collectively, this work facilitates marker-assisted selection to develop new varieties for cultivation in regions at risk from this emerging disease.

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BR 18-Terena: cultivar de trigo para o Brasil

Cited by 10 publications

References 0 publications

Wheat Resistance to Bacterial Leaf Streak Mediated by Silicon

Wheat Resistance to Bacterial Leaf Streak Mediated by Silicon

Wheat blast: from its origins in South America to its emergence as a global threat

Dissecting the genetic basis of wheat blast resistance in the Brazilian wheat cultivar BR 18-Terena

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