Abstract
Rice (Oryza sativa L.) plants in experimental plots in Beaumont, TX developed symptoms on leaf blades similar to white leaf streak caused by Mycovellosiela oryzae (Deighton & Shaw) Deighton (synonym Ramularia oryzae Deighton & Shaw) (1,3,4) during the late summer of 2009. Symptoms were observed on several rice cultivars and breeding lines including Cocodrie, Cypress, and Lemont. Lesions usually appeared on lower leaves and were approximately 2 to 7 mm long and linear with whitish or grayish centers surrounded by a narrow brown-or-dark brown margin. Symptoms were similar to narrow brown leaf spot caused by Cercospora janseana (Racib.) O. Const. (synonym C. oryzae Miyake) (3,4), but the centers of lesions were slightly wider (up to 2 mm). Symptoms were visible on the upper and lower leaf surfaces. Some lesions on heavily infected leaves were long (10 to 15 × 0.5 to 2 mm) whitish streaks parallel to the midrib. Leaves with typical symptoms were collected and incubated in a petri dish lined with moistened filter paper for 3 to 4 days at room temperature under a 12-h fluorescent photoperiod. Conidiophores were produced on external mycelium growing out through stomata on the lesion surface. Conidiophores were hyaline, straight, and 7 to 22 μm long and 2 to 3 μm wide with conidial scars. Conidia were washed from the lesions, diluted in sterilized distilled water, and placed on acidified potato dextrose agar. After 6 to 7 days of incubation at room temperature, slow-growing colonies were transferred onto potato dextrose agar (PDA). Three isolates were obtained from single-spore cultures. The colonies of these isolates grew similarly and very slowly on PDA and their radial growth averaged 0.8 mm/day at room temperature. The colonies were dense, grayish, and did not produce any pigments. Conidia were formed singly or in chains and measured 12 to 30 μm long. They were hyaline, straight, cylindrical, typically with no or one septum, a few with two to three septa, and had a hilum and tapered ends. Pathogenicity of these three isolates was assessed in greenhouse tests by spraying a conidial suspension (10 5 conidia/ml) onto 12 plants of each of the cvs. Cocodrie, Cypress and Lemont at the late tillering stage. Inoculum was obtained by harvesting conidia from the colonies grown on PDA for 3 weeks at room temperature under a 12-h fluorescent photoperiod. Plants sprayed with sterilized distilled water served as the controls. All plants were maintained in a humid chamber for 2 days and then grown in a greenhouse at 20 to 31°C. After 15 days, early lesions appeared on inoculated leaf blades; after 4 weeks, typical symptoms similar to those observed in the field developed. Control plants did not exhibit any symptoms. M. oryzae was reisolated from symptomatic plants, confirming that the disease was caused by this pathogen. To our knowledge, this is the first report of white leaf streak on rice in Texas and the second report after Louisiana (2). This disease has been reported in Papua New Guinea, the Solomon Islands, North Borneo, Sierra Leone, and Nigeria (3,4). References: (1) F. C. Deighton and D. Shaw. Trans. Br. Mycol. Soc. 43:515, 1960. (2) A. K. M. Shahjahan et al. Plant Dis. 82:1282, 1998. (3) B. C. Sutton and A. K. M. Shahjahan. Nova Hedwigia 25:197, 1981. (4) R. K. Webster and P. S. Gunnell. Compendium of Rice Diseases. The American Phytopathological Society, St. Paul, MN, 1992.
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Claims 9
Claim · model-written summary
Rice developed white leaf streak like lesions in Beaumont, Texas.
- Taxon
- Rice (Oryza sativa L.)
Oryza sativae0 - Organ / stage
- leaf bladese0
- Interactor
- Mycovellosiela oryzaee0pathogen
- Outcome
- symptoms on leaf blades similar to white leaf streake0
- Setting
- Beaumont, TXe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice (Oryza sativa L.) plants in experimental plots in Beaumont, TX developed symptoms on leaf blades similar to white leaf streak caused by Mycovellosiela oryzae”
Claim · model-written summary
Symptoms were observed on Cocodrie, Cypress, and Lemont rice.
- Taxon
- riceOryza sativae0
- Material
- Cocodrie, Cypress, and Lemonte0
- Outcome
- Symptomse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Symptoms were observed on several rice cultivars and breeding lines including Cocodrie, Cypress, and Lemont.”
Claim · model-written summary
Rice lesions on lower leaves were linear, 2 to 7 mm long, with pale centers and dark margins.
- Taxon
- RiceOryza sativat0
- Organ / stage
- lower leavese0
- Outcome
- Lesionse0
- Value
- 2 to 7 mme0
- Qualifier
- linear with whitish or grayish centers surrounded by a narrow brown-or-dark brown margine0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lesions usually appeared on lower leaves and were approximately 2 to 7 mm long and linear with whitish or grayish centers surrounded by a narrow brown-or-dark brown margin.”
t0“Rice”
Claim · model-written summary
Symptoms occurred on both surfaces of rice leaves.
- Taxon
- RiceOryza sativat0
- Organ / stage
- upper and lower leaf surfacese0
- Outcome
- Symptomse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Symptoms were visible on the upper and lower leaf surfaces.”
t0“Rice”
Claim · model-written summary
Some heavily infected rice leaves bore long whitish streaks parallel to the midrib.
- Taxon
- RiceOryza sativat0
- Organ / stage
- heavily infected leavese0
- Outcome
- whitish streakse0
- Value
- 10 to 15 × 0.5 to 2 mme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Some lesions on heavily infected leaves were long (10 to 15 × 0.5 to 2 mm) whitish streaks parallel to the midrib.”
t0“Rice”
Claim · model-written summary
Inoculated rice leaf blades developed early lesions after 15 days.
- Taxon
- RiceOryza sativat0
- Organ / stage
- leaf bladese0
- Treatment
- inoculatede0
- Outcome
- early lesions appearede0
- Qualifier
- After 15 dayse0
- Comparator
- Control plantse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After 15 days, early lesions appeared on inoculated leaf blades; after 4 weeks, typical symptoms similar to those observed in the field developed. Control plants did not exhibit any symptoms.”
t0“Rice”
Claim · model-written summary
Inoculated rice developed typical field like symptoms after four weeks while controls remained symptom free.
- Taxon
- RiceOryza sativat0
- Treatment
- inoculatede0
- Outcome
- typical symptoms similar to those observed in the field developede0
- Qualifier
- after 4 weekse0
- Comparator
- Control plantse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After 15 days, early lesions appeared on inoculated leaf blades; after 4 weeks, typical symptoms similar to those observed in the field developed. Control plants did not exhibit any symptoms.”
t0“Rice”
Claim · model-written summary
The pathogen was reisolated from symptomatic rice, confirming the causal agent.
- Taxon
- RiceOryza sativat0
- Interactor
- M. oryzaee0pathogen
- Outcome
- M. oryzae was reisolated from symptomatic plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“M. oryzae was reisolated from symptomatic plants, confirming that the disease was caused by this pathogen.”
t0“Rice”
Claim · model-written summary
The authors report white leaf streak on rice in Texas for the first time.
- Taxon
- riceOryza sativae0
- Outcome
- white leaf streake0
- Setting
- Texase0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“this is the first report of white leaf streak on rice in Texas”
The same questions in other papers
inoculation · disease · Oryza sativa (rice)Positive and negative results
51 papers in the same direction as this paper · 106 in the opposite direction
- positive
- positive
- positive
154 papers more in this group
See all 158 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.