Thesis on bacterial leaf blight of rice


thesis on bacterial leaf blight of rice

Sindhan (1997) reported that the phylloplane organisms isolated from rice leaves, Pseudomonas acidovorus, Aspergillus ochraceus,. Economic Importance of Bacterial Leaf Blight Disease of Rice: advertisements: The disease is a typical vascular wilt , leaf blight being only the mild phase resulting from secondary infection. By signing up, you agree to thesis on bacterial leaf blight of rice our Privacy Notice. Sixteen isolates produced susceptible reaction on IR8, IR 20, Cempo selak and Java 14 and resistant reaction on. Oryzoides, Zizania latifolia and Phalaris arundincicea can become severely infected with bacterial blight. Perpetuation : The pathogen perpetuates in diseased stubbles in double cropped areas of rice in India and it cannot survive from season to season in single cropped areas. The isolates of the cfmsal bacterium vary in the rate of utilization of different carbon and nitrogen source. Seed infection occurs through the vascular system and 90 per cent of seed infection is observed immediately after harvesting. Longistaminata in Mali, Cameroon and Niger and. Use of Natural Products/Botanicals: Mary (1986) observed that a foliar spray of cowdung extract (20 g/lit) was as effective as Penicillin, Pushamycin and Streptomycin in controlling Xanthomonas campestris. Oryzae isolates in vitro showed that 7 isolates were sensitive to Achromycin, Agrimycin-100 to varying degrees.

Thesis On Bacterial Leaf Blight Of Rice

Oryzae in vitro (Balaraman and Rajagopalan, 1978Some synthesized organic arsine xanthate, had an antagonistic effect on the growth of the bacterium. Oryzae in glasshouse, representing 25 endemic locations in India, using clip inoculation on a selected set of rice differential varieties. Various mechanisms of disease, including quorum sensing and biofilm formation, have been observed in rice bacterial blight and Xoo. This is thesis on bacterial leaf blight of rice direct relationship of root injury and the kresek phase of the disease. Whereas, Valluvaparidasan and Mariappan (1988) demonstrated that sucrose was the most preferable carbon source for.


Hong (1999) studied that Bacillus subtilis B56 showed antagonistic activity against Xanthomonas oryzae. What it does, bacterial blight is caused by, xanthomonas oryzae. Colonies of all species of Xanthomonas are normally yellow, smooth, round, entire and butyrous, at least when young, but may show surface markings such as striations and become lobed when older. Yields were also increased by 250 ppm Agrimycin and 50 to 100 ppm Erythromycin. It cannot tolerate more than 3 per cent concentration of sodium chloride.


Bacterial Leaf Blight Disease of Rice- Discussed!

Oryaze by paper thesis on bacterial leaf blight of rice disc diffusion and food poison methods. Agrimycin 100 copper oxychloride and Agrimycin 100 alone gave equal control and were significantly superior to control the disease with treatments involving Paushamycin and Streptomycin. Lesion length, kresek incidence and foliage blight in inoculated seedling decreased with increasing proportions. The thermal death point is 51 to 53C. In 1990, the pathogen was elevated to a species status and was named Xanthomonas oryzae. Thesis detecting durable resistance TO rice of my thesis. The lesion may also extend to the leaf sheath where they may reach to the lower and on these cultivars. Meena and Gopalakrishnan (2004) evaluated 14 plants extract against Xanthomonas oryzae. Although not commonly found in the United States, a bacterial strain related to Xoo has been listed as an agricultural select agent by the.S.


The bacterial ooze later on dries up and becomes small yellowish beads underneath the leaf. MSc Thesis on the Management of Bacterial Blight of Sesame Asfaw As member of the Board of Examiners of the MSc Thesis Open Defense Examination,. Reitsma and Schure (1950) reported a disease called Kresek in Indonesia. The primers OPA-03, OPA-04, OPA-10, OPA-11, OPK-7, OPK-12 and OPK-17 generated simple, specific and reproducible fingerprint patterns, indicating usefulness of rapd markers in differentiating. Oryzae by dual culture method revealed that Bacillus subtilis,. Oryzae and confirmed that kresek is one of the symptoms of the bacterial blight syndrome. Symptomatology of Bacterial Leaf Blight Disease of Rice: Bacterial blight has three significant symptoms viz. In the quest for increasing rice production, man has resorted to intensive methods of rice cultivation involving high-yielding susceptible cultivars with reduced genetic variability, higher plant population per unit area, high doses of nitrogenous fertilizers and staggered sowing and planting. Oryzae followed by glucose, mannose, galactose and maltose. The disease caused substantial decrease of 50-75 per cent in head rice recovery. Among the major diseases of rice, bacterial leaf blight causes substantial loss in quality and quantity of the. Hsu (1966) reported L-glutamic acid, L-aspartic acid as the best source of nitrogen and cystine supported some growth at low concentration. Pale yellow leaves can be found on 3 week old seedlings when artificially inoculated in the field on plants that are tillering.


Bacterial blight - irri Rice Knowledge Bank

Demonstrated that loss of effectiveness of one rice bacterial blight R gene. Varietals Resistance: As a result of efforts on breeding and thesis on bacterial leaf blight of rice selection by various workers, some resistance donating lines and a few commercial varieties have been identified. After the introduction and cultivation over a large acreage of new high yielding but susceptible rice cultivars, the disease has become one of the most serious problems on rice in India. On the basis of the consensus of three clustering statistics, the collection formed five clusters. After invasion, the bacteria multiply in the intercellular spaces of parenchyma without showing any symptoms. Duter (fentin hydroxide) was next to mercuric chloride in effectiveness against. Jaya, the most popular in the region. On tetrazolium chloride agar medium, the growth of the bacterium was restricted and the colonies developed pink centers with white margins. The 48 hours old colonies were round, deep yellow, raised muciod measuring.1-0.2 cm in diameter. The bacteria coming in contact with the surface of rice seedlings become activated and multiply. Buffalo urine at 10 per cent concentration was found to completely inhibitory to the mycelium of Macrophomina phaseolina and Fusarium oxysporum lycopersicae. Showed a curative effect against. Narasimhan (1995) studied inhibitory effect of Curcuma longa and Azadirachta indica against Xanthomonas oryzae.


Smiths concept and subsequently to Xanthomonas oryzae (Uyeda and Ishiyama) Dowson. Several groups of fungicides have been tested against. Advertisements: Potential losses in grain yield to the disease was 65 per cent and 10 per cent in highly susceptible Karyona and moderately susceptible IR-8, respectively and insignificant in IR-22 under field conditions. Lecithinase is not produced. Thesis On Bacterial Leaf Blight Of Rice. The causal organism was called Xanthomonas kresek Schure (1953). As a result of reduction in the number of filled grains in diseased panicle, a loss in weight.38 per cent was obtained. Two DNA sequences from. Yield loss simulation (YLS) model was used to simulate the effect of bacterial leaf blight on the growth and yield of rice cultivar IR-64. Preventive spray of Fentiazon gave better control than curative ones. Resistance genes can be specific for different causal.



Sitemap