Abstract
To examine the impact of regional and seasonal variations on the incidence and severity of sheath rot, a major seed-borne disease of rice caused by Sarocladium oryzae, data on incidence and severity were collected from 27 selected fields in the Gazipur, Rangpur, Bogra, Chittagong, Comilla, Gopalgonj, Jessore, Manikgonj, and Bhola districts of Bangladesh in rain-fed and irrigated conditions. Cultural variability of 29 pathogen isolates obtained from 8 different locations was studied on potato dextrose agar (PDA) and genetic variability was determined by DNA fingerprinting using variable number tandem repeat-polymerase chain reaction markers. Overall, disease incidence and severity were higher in irrigated rice. Disease incidence and severity were highest in the Bhola district in rain-fed rice and lowest in irrigated rice. Mycelial growth of 29 representative isolates was found to vary on PDA and the isolates were divided into 6 groups. The range of the overall size of conidia of the selected isolates was 2.40-7.20 x 1.20-2.40 μm. Analysis of the DNA fingerprint types of the 29 isolates of S. oryzae, obtained from the amplification reactions, revealed 10 fingerprinting types (FPTs) that were 80% similar. FPT-1 was the largest group and included 13 isolates (44.8%), while FPT-2 was the third largest group and included 3 isolates. Each of FPT-3, 4, 5, and 6 included only 1 isolate. We observed no relationship between cultural and genetic groupings.
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Claims 9
Claim · model-written summary
Rice sheath rot incidence and severity were higher under irrigation than rain-fed conditions.
- Taxon
- rice
Oryza sativat0 - Interactor
- Sarocladium oryzae
Sarocladium oryzaet0pathogen - Outcome
- disease incidence and severitye0
- Direction
- highere0
- Setting
- irrigated ricee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Overall, disease incidence and severity were higher in irrigated rice.”
t0“rice caused by Sarocladium oryzae”
Claim · model-written summary
In Bhola, rice sheath rot incidence and severity were highest in rain-fed rice and lowest in irrigated rice.
- Taxon
- riceOryza sativat0
- Interactor
- Sarocladium oryzaeSarocladium oryzaet0pathogen
- Outcome
- Disease incidence and severitye0
- Direction
- higheste0
- Setting
- Bhola districte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Disease incidence and severity were highest in the Bhola district in rain-fed rice and lowest in irrigated rice.”
t0“rice caused by Sarocladium oryzae”
Claim · model-written summary
Growth of 29 Sarocladium isolates varied on PDA and formed six groups.
- Taxon
- Sarocladium oryzaeSarocladium oryzaet0
- Outcome
- Mycelial growthe0
- Value
- 6 groupse0
- Setting
- PDAe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mycelial growth of 29 representative isolates was found to vary on PDA and the isolates were divided into 6 groups.”
t0“Sarocladium oryzae”
Claim · model-written summary
Selected Sarocladium isolates had conidia sized 2.40-7.20 x 1.20-2.40 μm.
- Taxon
- Sarocladium oryzaeSarocladium oryzaet0
- Outcome
- size of conidiae0
- Value
- 2.40-7.20 x 1.20-2.40 μme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The range of the overall size of conidia of the selected isolates was 2.40-7.20 x 1.20-2.40 μm.”
t0“Sarocladium oryzae”
Claim · model-written summary
DNA fingerprinting distinguished ten Sarocladium types at 80% similarity.
- Taxon
- S. oryzaeSarocladium oryzaee0
- Outcome
- fingerprinting types (FPTs)e0
- Value
- 10 fingerprinting typese0
- Qualifier
- 80% similare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Analysis of the DNA fingerprint types of the 29 isolates of S. oryzae, obtained from the amplification reactions, revealed 10 fingerprinting types (FPTs) that were 80% similar.”
t0“Sarocladium oryzae”
Claim · model-written summary
FPT-1 included 13 isolates, or 44.8%.
- Taxon
- Sarocladium oryzaeSarocladium oryzaet0
- Outcome
- FPT-1 was the largest groupe0
- Value
- 13 isolates (44.8%)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“FPT-1 was the largest group and included 13 isolates (44.8%)”
t0“Sarocladium oryzae”
Claim · model-written summary
FPT-2 included three isolates.
- Taxon
- Sarocladium oryzaeSarocladium oryzaet0
- Outcome
- FPT-2 was the third largest groupe0
- Value
- 3 isolatese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“FPT-2 was the third largest group and included 3 isolates”
t0“Sarocladium oryzae”
Claim · model-written summary
FPT-3, FPT-4, FPT-5 and FPT-6 each included one isolate.
- Taxon
- Sarocladium oryzaeSarocladium oryzaet0
- Outcome
- FPT-3, 4, 5, and 6e0
- Value
- 1 isolatee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Each of FPT-3, 4, 5, and 6 included only 1 isolate.”
t0“Sarocladium oryzae”
Claim · model-written summary
Cultural and genetic isolate groupings were unrelated.
- Taxon
- Sarocladium oryzaeSarocladium oryzaet0
- Outcome
- relationship between cultural and genetic groupingse0
- Comparator
- cultural and genetic groupingse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“We observed no relationship between cultural and genetic groupings.”
t0“Sarocladium oryzae”