Comprehensive studies were performed on the etiology, epidemiology and. Oryzae here in after abbreviated as xoo islam et al. The disease is caused by the bacteria xanthomonas oryzae pv. It is found worldwide in both temperate and tropical regions, causing epidemics in irrigated and rainfed lowlands, especially where fields have poor drainage and the potential for flooding.
Bacterial leaf blight bb is a worldwide destructive rice disease caused by pathogen xanthomonas oryzae pv. Psb rc82 is the standard variety of rice used in southeast asia, and the use of this cultivar enables the harvest of an estimated 0. Yeshi wamishe, christy kelsey, scott belmar, tibebu gebremariam, danny mccarty subject. International journal of current microbiology and applied. There is a need to use environmentally safe approaches to overcome the loss of grain yield in rice due to this disease. Besides the economic importance of the disease, the ricexoo system serves as an excellent model for studying hostpathogen interactions because the genomes of both interacting partners are sequenced and there is considerable genetic variation in the. Unlike most rice diseases bacterial panicle blight develops under hot dry conditions. Selection of rice genotypes through comparative response. Progression of disease severity of bacterial leaf blight was monitored at weekly intervals till maximum infection was attained.
Recovery plan for xanthomonas oryzae causing bacterial blight and bacterial leaf streak of rice june 4, 20 contents page executive summary 2 contributors 4 i. Seedlings in the nursery show circular, yellow spots in the margin, that enlarge, coalesce leading to drying of foliage. Upon intersect join of the hapmap file and the phenotype data, one more line. Bb can cause as high as 2050% yield reduction in severe epidemics. However, thecosteffective way to control this disease among resourcepoor farmers is the use of resistant rice cultivars. Frontiers biocontrol of bacterial leaf blight of rice. Linkage analyses of resistance genes to bacterial blight. Introduction b acterial leaf blight of rice is among the most devastating pathosystem of rice in nearly all the rice growing localities in tropical and temperate regions especially in asian countries. Identification of bacterial leaf blight resistance genes in. As a model disease, the significant progress has been made in past few years on different aspects and levels of research on this disease. Mar 23, 2015 why is it important bacterial blight is one of the most serious diseases of rice. Plant growth promotion and suppression of bacterial leaf. Yield loss due to bacterial blight can be as much as 70% when susceptible varieties are grown, in environments favorable to the disease. Improvement of basmati rice varieties for resistance to.
Overexpression of osmyc2 results in the upregulation of. Genetic studies on the resistance to bb have been conducted mainly in japan and at the international rice research institute irri since they were initiated by nishimura 6. Bacterial leaf blight of rice kills seedlings and destroys the leaves of older plants. Plant diseases caused by bacteria narratives bacterial blight of rice xanthomonas oryzae pv.
As a model disease, the significant progress has been made in past few years on different aspects and. The pathogenicity of bacterial leaf blight has confirmed that the causal bacterium is xanthomonas oryzae pv. The disease is estimated to cause annual rice production losses of 2030 percent throughout ricegrowing countries in asia. The present study was conducted to evaluate the potential of rice rhizosphere associated antagonistic bacteria for growth promotion and disease suppression of bacterial leaf blight blb. Through rigorous screening and selection, a number of resistant cultivars have been produced and utilized, but resistance was overcome by the development of mutant strains of.
Feb 12, 2019 bacterial blight bb caused by the xanthomonas oryzae pv. Identification and characterization of a spottedleaf. Other characterized tal effector targets include the rice bacterial blight r genes xa27 ref. Bacterial blight bb of rice caused by xanthomonas oryzae pv. Genetic analysis of resistance to bacterial blight, xanthomonas. Bacterial blight is a vascular disease resulting in a systemic infection of rice and it produces tannishgrey to white lesions along the veins. Phenotypic screening for bacterial leaf blight resistance thirtyfive wild rice accessions along with resistant rp bio226, crmas 2237, crmas 223271, and tetep and susceptible pusa basmati1 controls were screened against the wildtype strain of bx043 xoo under epiphytotic conditions during the20 monsoon season. Bacterial leaf blight blb is one of the most serious threats to the rice crop in irrigated and rainfed areas of the world. Breeding twoline hybrid rice with disease resistance is an effective approach to stabilize rice yield in commercial rice production of china. Incidence of kresek a systemic symptom of bacterial leaf blight xanthomonas oryzae of rice in subtropical region of jammu. Bacterial panicle blight of rice in arkansas fsa7580 author. A novel strain of lysobacter antibioticus, which was isolated from the rhizosphere of rice in yunnan province of china, can significantly inhibit the growth of various phytopathogenic bacteria and fungi, especially bb pathogen xoo. Linkage analyses of resistance genes to bacterial blight in rice. Management of bacterial leaf blight of rice agropedia.
Here, we report a proteomics investigation of xoo compatible race k3. Now these tech nologies are being used to characterize the pathogen, reevaluate the ecology and epidemiology of the disease, and study hostparasite. Unfortunately, the bacterial leaf blight pathogen exists with a very high degree of racecultivar specificity ninoliu et al. Incorporation of the novel bacterial blight resistance. Mar 31, 2017 remove weed hosts and plow under rice stubble, straw which can serve as hosts of bacteria. Bacterial blight bb, caused by xanthomonas oryzae pv. The disease was first observed by the farmers of japan in 1884 tagami and mizukami, 1962. Bacterial panicle blight of rice in arkansas fsa7580. Unlike most rice diseases bacterial panicle blight develops after heading. Bacterial blight bb disease is one of the most important diseases that can be harmful to rice crops, especially on low land rice ou, 1985. Arkansas,division,agriculture,rice,panicle blight,bacteria,burkhoderia,glumae,fsa 7580 created date. Improved samba mahsuri ism is an elite, highyielding, finegrain type, bbresistant rice variety possessing three bbresistant genes xa21, xa and xa5 and is highly popular in the southern parts of india.
Accelerated molecular breeding of a novel ptgms line. Many bacterial diseases of plants depend on the interaction of type iii effector genes of the pathogen and diseasesusceptibility genes of the host. A total of 811 rhizospheric bacteria were isolated and screened against 3 prevalent strains of blb pathogen xanthomonas oryzae pv. May 24, 2017 other characterized tal effector targets include the rice bacterial blight r genes xa27 ref. Breeding for resistance through incorporating broad spectrum. Losses due to bacterial panicle blight include reductions in yield and milling.
Rice oryza sativa and related rice species oryza australiensis, oryza coarctata, oryza jeyporensis, oryza malampuzhaensis, oryza officinalis, oryza perennis, and oryza rufipogon. Incorporation of the novel bacterial blight resistance gene. The bacterial blight bb disease of rice bacterial blight caused by xanthomonas oryzae pv. Weekly mean percentage of ba cterial leaf blight disease progression in rice genotypes recorded in september 2014 15. A novel resistance gene for bacterial blight in rice, xa43t. In rice there are 38 major genes for resistance to bacterial blight and more. Aug 24, 2019 the resistance showed by spl11 to rice blast and bacterial blight is a nonspecific resistance which is likely to be regulated by the downstream components of defense pathways, which in turn suggest that there might involve a possible crosstalks between the cell death pathway and defense pathways of blast and bacterial blight resistance huang. The present study aimed to develop inocula, based on native antagonistic bacteria for biocontrol of blb and to increase the.
In severe epidemics, crop loss may be as high as 75 percent, and millions of hectares of rice are infected annually. Selection of rice genotypes through comparative response to. Bacterial blight bb in rice caused by xanthomonas oryzae pv. Remove weed hosts and plow under rice stubble, straw which can serve as hosts of bacteria. Tal effector driven induction of a sweet gene confers. Wrky tfs are considered as key regulators in rice defense responses. Management of bacterial leaf blight disease in rice with endophytic bacteria article pdf available in world applied sciences journal 2812. Pdf bacterial blight bb of rice caused by xanthomonas oryzae pv. Marker assisted backcross breeding was employed to incorporate the blast resistance genes, pi2 and pi54 and bacterial blight bb resistance genes xa and xa21 into the genetic background of pusa basmati 1121 pb1121 and pusa basmati 6. Bacterial leaf blight is one of the most serious diseases of rice. Kresek symptom is seen in seedlings, 12 weeks after transplanting. Rice bacterial blight bb, caused by xanthomonas oryzae pv. The disease can be very explosive, and almost completely reduce grain yields under favorable conditions. The rice bowl of chhatisgarh in madhya pradesh and the limited rice areas in gujarat, rajasthan, himachal pradesh and haryana states have not yet been explored for bacterial blight.
Bacterial blight bb, caused by xanthomonas campestris pv. The disease poses a continuous threat to rice production especially in south and southeast asia 1,2. Jul 26, 2014 bacterial blight bb of rice caused by xanthomonas oryzae pv. Developing resistant lines or cultivars is the most effective and economical way to control this disease, while. Pdf this is a status paper on a destructive rice disease bac terial blight bb, caused by xanthomonas oryzae pv. Forty resistant rice cultivars were studied for theinheritance of resistance to bacterial blight usingphilippine races of xanthomonas oryzae pv.
Why is it important bacterial blight is one of the most serious diseases of rice. In rice there are 38 major genes for resistance to bacterial blight and more than 30 races of x. Watersoaked to yellowish stripes on leaf blades or starting at leaf tips then later increase in length and width with a wavy margin 2. Two major diseases of rice namely, rice blast caused by the heterothallic ascomycete magnaporthe oryzae and bacterial blight bb disease caused by the gram negative bacterial pathogen xanthomonas oryzae pv. Improvement of basmati rice varieties for resistance to blast. Here, we show that expression of the rice gene os8n3, a member of the mtn3 gene family from plants and animals, is elevated upon infection by xanthomonas oryzae pv. Rice bacterial blight, deadly bacterial disease that is among the most destructive afflictions of cultivated rice. Bacterial blight is one of the most serious diseases of rice.
We improved the blast and bacterial blight resistance of guangzhan634s, an elite photoperiod and thermosensitive male sterile ptgms line widely used in twoline hybrid rice, by introducing the r genes pi2 and xa7 conferring resistance to rice. Foreground selection for target genes was followed by arduous phenotypic and background selection which fasttracked the recovery of recurrent parent. Management of bacterial leaf blight is most commonly done by planting disease resistant rice plants. Involvement of osjaz8 in jasmonateinduced resistance to. The disease was first observed in 188485 in kyushu, japan, and the causal agent, the. Pdf management of bacterial leaf blight disease in rice. The bacteria attack the leaves giving a reduction in photosynthetic area. Frontiers biocontrol of bacterial leaf blight of rice and. For instance, oswrky45 has been demonstrated to play a crucial role in defense responses against rice blast and bacterial blight, two of the most serious rice diseases, caused by magnaporthe oryzae and xanthomonas oryzae pv. It will be seen that the endemic areas listed above include both single as well as double cropped ones. Bacterial blight, a serious threat to productivity of rice.
Rice phyllosphere actinomycetes as biocontrol agent of. The disease can be very explosive, and can almost completely destroy grain production under favorable conditions. Biological control of rice bacterial blight by lysobacter. The earlier the disease occurs, the higher the yield loss. Bacterial blight of rice is an important disease in asia and africa. Recently, it has also been reported from east africa. Besides the economic importance of the disease, the rice xoo system serves as an excellent model for studying hostpathogen interactions because the genomes of both interacting partners are sequenced and there is considerable genetic variation in the. The resistance showed by spl11 to rice blast and bacterial blight is a nonspecific resistance which is likely to be regulated by the downstream components of defense pathways, which in turn suggest that there might involve a possible crosstalks between the cell death pathway and defense pathways of blast and bacterial blight resistance huang. The 2nd international conference on bacterial blight of rice. A novel resistance gene for bacterial blight in rice, xa43.
Bacterial blight bb caused by the pathogen xanthomonas oryzae pv. Seven, out of ten rice genotypes, were highly infected by bacterial leaf blight of rice. Pdf update on bacterial blight of rice researchgate. Broadspectrum resistance to bacterial blight in rice using genome. Rice phyllosphere actinomycetes as biocontrol agent of bacterial leaf blight disease on rice 1noor andryan ilsan, 2abdjad asih nawangsih and 1aris tri wahyudi 1graduate school, departement of biology, faculty of mathematics and natural science, bogor agricultural university, darmaga, bogor 16680, west java, indonesia. Experts have confirmed the presence of rice blast fungal disease in.
Biological control of rice bacterial blight by plant. Identification of bacterial leaf blight resistance genes. The disease is extremely serious worldwide and has emerged as a major problem in irrigated crops in the sahel. Breeding approaches for bacterial leaf blight resistance.
Rice bacterial blight, also called bacterial blight of rice, deadly bacterial disease that is among the most destructive afflictions of cultivated rice oryza sativa and o. Appearance of bacterial ooze that looks like a milky or. The bacterial blight disease of rice having been recognised in india recently, the informa tion available on various aspects of the disease under indian. Os8n3 is a host diseasesusceptibility gene for bacterial.
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