[PDF] Assessment of genetic diversity and population structure of Xanthom*onas oryzae pv. oryzae with a repetitive DNA element | Semantic Scholar (2024)

FAQs

What is the colony morphology of Xanthom*onas oryzae PV oryzae? ›

Xanthom*onas oryzae pv. oryzae (Xoo) is a gram-negative bacterium. It is a non- sporeforming rod and is 0.55 to 0.75 x 1.35 to 2.17 µm in size. Colonies are light yellow, circular, convex, and smooth.

oryzae causes bacterial blight (BB) of rice which is one of the most important diseases of rice in most of the rice growing countries. Bacterial blight of rice has high epidemic potential and is destructive to high-yielding cultivars in both temperate and tropical regions especially in Asia.

The nucleotide sequence was determined for the genome of Xanthom*onas oryzae pathovar oryzae (Xoo) KACC10331, a bacterium that causes bacterial blight in rice (Oryza sativa L.). The genome is comprised of a single, 4 941 439 bp, circular chromosome that is G + C rich (63.7%).

bacterial leaf blight of rice, Xanthom*onas oryzae pv. oryzae Xanthom*onadales: Xanthom*onadaceae.

Bacterial Blight of Rice Symptoms

Primarily the plant is light green to greyish green and water-soaked streaks appear on the leaves but once it gets affected by the bacterial blight, they form larger yellowish lesions with uneven edges. Further, the leaves become yellow, gradually wilt and die.

Xanthom*onas oryzae is a species of bacteria. The major host of the bacterium is rice.

These data suggest that H₂O₂ is the lethal agent responsible for killing the bacteria as a result of these treatments.

Xanthom*onas oryzae pv.

Xanthom*onas oryzae is a Gram-negative, aerobic, plant pathogen that is the main cause of blight and leaf streak of rice. The hook is straight, and its length is much shorter than any other hooks. X. oryzae has a type III virulence secretion system (hrc, hrp, hpa).

M. oryzae is a haploid, filamentous Ascomycete with a relatively small genome of ~40 Mb contained in 7 chromosomes. The majority of fungal pathogens belong to this taxonomic class or exist as related asexual forms.

oryzae Y5 strain had raw data assembled into 2,271 Mbp with an N50 value of 10,563 bp. A genome sequence of 50.3 Mb was polished and assembled into 53 contigs with an N50 length of 1,785,794 bp, maximum contig length of 3,223,184 bp, and a sum of contig lengths of 51,182,778 bp.

How big is the genome of the JC virus? ›

The JCV genome is a circular, dsDNA genome, approximately 5.1 kb in size. The viral genome is divided into the early coding region and the late coding region, which are separated by the non-coding control region or regulatory region (RR).

Bacterial blight is caused by Xanthom*onas oryzae pv. oryzae. It causes wilting of seedlings and yellowing and drying of leaves.

Favorable Environmental Conditions

Development of bacterial blight is promoted by cool, wet weather (70 – 80°F). Infection can occur early but is most common at mid season and continues until hot and dry weather limits development. Disease outbreaks often follow windy, rainstorms.

As a general rule, bacterial infections are easier to treat than viral infections, since the armamentarium of antimicrobial agents with activity against bacteria is more extensive.

On blood agar, Aeromonas forms circular colonies that are 1-3 mm in diameter that start off grayish in color due to beta-hemolysis and after three days become dark green. DNase culture is positive. Maximal growth is seen when the temperature is between 37 and 44 蚓.

Morphology: Cell: spherical, elongated, swollen, club-shaped, curved, or filamentous;f ound as single cells, in pairs or in chains. Colony: smooth or rough spheroid to a flattened aggregate with a characteristic pillowed surface surrounded by a sheath of cellulose microfibrils.

Growth rates of Xanthom*onas vary widely across the genus; some strains grow quickly, producing visible colonies in 24–36 h at 25°C, while other strains take 2–3 days. Colonies are usually yellow, smooth, butyrous, and mucoid or viscid (Bradbury, 1984).

The diverse morphological feature is seen among the members of Actinobacteria. They display different cellular arrangements and branching. In general, they are rod-shaped, about 0.5 to 2.5 μm (some are even up to 5 μm) in length. Some like Micrococcus are cocci also.