scholarly journals First Report of Southern Leaf Blight Caused by Cochliobolus heterostrophus on Corn (Zea mays) in Fujian Province, China

Plant Disease ◽  
2016 ◽  
Vol 100 (8) ◽  
pp. 1781 ◽  
Author(s):  
Y. L. Dai ◽  
X. J. Yang ◽  
L. Gan ◽  
F. R. Chen ◽  
H. C. Ruan ◽  
...  
Keyword(s):  
Zea Mays ◽  
Leaf Blight ◽  
Cochliobolus Heterostrophus ◽  
Fujian Province ◽  
First Report ◽  
Southern Leaf Blight

scholarly journals First Report of Northern Corn Leaf Blight Caused by Setosphaeria turcica on Corn (Zea mays) in Fujian Province, China

Plant Disease ◽  
2017 ◽  
Vol 101 (5) ◽  
pp. 831
Author(s):  
N. N. Shi ◽  
Y. X. Du ◽  
H. C. Ruan ◽  
X. J. Yang ◽  
Y. L. Dai ◽  
...  
Keyword(s):  
Zea Mays ◽  
Leaf Blight ◽  
Fujian Province ◽  
Setosphaeria Turcica ◽  
First Report ◽  
Northern Corn Leaf Blight ◽  
Corn Leaf Blight

Cochliobolus heterostrophus. [Descriptions of Fungi and Bacteria].

1971 ◽  
Author(s):  
M. B. Ellis
Keyword(s):  
Zea Mays ◽  
Geographical Distribution ◽  
Leaf Sheath ◽  
Leaf Blight ◽  
Disease Spread ◽  
Cochliobolus Heterostrophus ◽  
Sorghum Vulgare ◽  
Main Host ◽  
The Tropics ◽  
Diffuse Lesion

Abstract A description is provided for Cochliobolus heterostrophus. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Generally on leaves of Zea mays, the main host, Euchlaena mexicana, Sorghum vulgare and many species of Gramineae (41: 40; 45, 3084; 48, 414; 50, 2257i). During an epidemic in USA caused by race T in 1970 no important hosts apart from Z. mays were noted (50, 2257b). DISEASE: Southern leaf blight of maize, forming very numerous lesions up to 2.5 cm long, mostly on the leaves. They are at first elliptical, then longitudinally elongate, becoming rectangular as restriction by the veins occurs; cinnamon-buff (sometimes with a purplish tint) with a reddish-brown margin and occasionally zonate, coalescing and becoming greyish with conidia. Symptoms caused by race T show a less well defined, somewhat diffuse lesion, with marginal chlorosis leading to leaf collapse, and all parts of the plant can be attacked. Perithecia have been recently reported in the field at the junction of leaf sheath and blade (50, 2257j). GEOGRAPHICAL DISTRIBUTION: Widespread in the tropics and subtropics (CMI Map 346, ed. 3, 1969) but not reported from Australia. Records not yet mapped are: Brunei, Guatemala, Hawaii, Israel, Laos, Mexico, Salvador and Venezuela. TRANSMISSION: Presumably air-dispersed but no detailed studies seem to have been reported. During the recent USA outbreak the disease spread from Florida to Maine in c. 6 months (50, 2257c). Spread by seed occurs (50, 3690, 3692; Crosier & Boothroyd, Phytopathology 61: 427, 747).

scholarly journals First Report of Leaf Spot Caused by Cochliobolus eragrostidis on Corn (Zea mays L.) in Fujian Province, China

Plant Disease ◽  
2018 ◽  
Vol 102 (2) ◽  
pp. 439-439 ◽  
Author(s):  
L. Gan ◽  
Y. Dai ◽  
X. Yang ◽  
Y. Du ◽  
H. Ruan ◽  
...  
Keyword(s):  
Zea Mays ◽  
Leaf Spot ◽  
Zea Mays L ◽  
Fujian Province ◽  
First Report

Mapping quantitative trait loci associated with southern leaf blight resistance in maize ( Zea mays L.)

2019 ◽  
Vol 167 (10) ◽  
pp. 591-600 ◽  
Author(s):  
Maninder Kaur ◽  
Yogesh Vikal ◽  
Harleen Kaur ◽  
Lalit Pal ◽  
Kirandeep Kaur ◽  
...  
Keyword(s):  
Zea Mays ◽  
Quantitative Trait Loci ◽  
Quantitative Trait ◽  
Zea Mays L ◽  
Leaf Blight ◽  
Blight Resistance ◽  
Trait Loci ◽  
Southern Leaf Blight

scholarly journals First Report of Leaf Blight Caused by Limonomyces roseipellis on Maize (Zea mays L) in China

Plant Disease ◽  
2021 ◽  
Author(s):  
XI XU ◽  
Xilang Yang ◽  
Li Zhang ◽  
Hanshui Cao ◽  
Peng Cao ◽  
...  
Keyword(s):  
Zea Mays ◽  
Zea Mays L ◽  
Large Subunit ◽  
Morphological Characteristics ◽  
Small Subunit ◽  
Leaf Blight ◽  
Light Cycle ◽  
Tissue Samples ◽  
First Report ◽  
Maize Plants

Maize (Zea mays L.) is one of the major crops in China. In July 2020, leaf blight was observed on approximately 18% of maize plants at the 852 Farm, Heilongjiang province. Symptoms appeared as yellow necrotic lesions on leaf tips and margins, which later expanded to the entire. The disease was first observed on the lower leaves of the plants and then progressed up the plant. Thirty symptomatic leaves were collected in 2020, and tissue samples between healthy and necrotic area (4 × 2 mm) were surface disinfected with 1% NaOCl for 3 min, 70% ethanol for 10 s, and washed three times with sterile water. Disinfected tissues were placed on potato dextrose agar (PDA) amended with streptomycin sulfate (50 mg/liter) and incubated at 25°C for 1 week. Cultures were purified using the hyphal-tip technique for morphological and molecular analyses. Morphological characteristics were observed on 1-week-old PDA cultures grown at 25°C. Mycelium changed from cream colored to pale pink or reddish, and the back of plate turned pink with time. Hyphae were hyaline, 2 to 7 μm wide, with clamps at primary septa. Hyaline basidiospores were sphere to ellipsoid, and ranged from 8 to 10 × 6 to 9 μm. Based on the presence of clamp connections and morphological features, the fungus was preliminarily identified as Limonomyces roseipellis (Stalpers et al. 1982). To confirm the identity of L. roseipellis, primers ITS1/ITS4 (White et al. 1990), MS1/MS2 (White et al. 1990), and LR0R/LR5 (Vilgalys and Hester 1990) were used to amplify the internal transcribed spacer (ITS) region, the partial mitochondrial small subunit rDNA (mtSSU) and nuclear large subunit rDNA (nuLSU), respectively. These sequences were deposited in GenBank (GenBank accession no.s MW067756, MW322806 and MW386178). The ITS sequence had 99.55% nucleotide identity (660 bp/668 bp) with L. roseipellis isolate EF82 (GenBank accession no. MK918632). The mtSSU sequence was 99.69% identical (634 bp/636 bp) to that of L. roseipellis strain SY-LQG101 (Genbank accession no. KF824718). The nuLSU sequence was 99.14% identical (924 bp/932 bp) to that of L. roseipellis (GenBank accession no. EU622844). A single basidiospore was isolated and cultured on PDA for pathogenicity testing. To fulfill Koch’s postulates, ten healthy, surface-disinfected maize plants grown in pots (four to five leaves stage) were sprayed with basidiospore suspension (1×106 spores/ml); another ten healthy surface-disinfected maize plants sprayed with distilled water to serve as controls. Plants were sealed in plastic bags immediately after inoculation and maintained at 90% relative humidity in a mist chamber for 24 h at 25°C with a 12-h light cycle (Nicoli et al. 2016). Plants were moved and maintained in the greenhouse and observed for disease development. The experiment was conducted twice. Leaf blight symptoms appeared on all inoculated plants 3 to 5 days postinoculation and were consistent with symptoms observed in the field. No disease symptoms were observed on control plants. The pathogen was reisolated from diseased plants, and species identification was confirmed by the morphological and molecular method described. L. roseipellis has been reported to infect Cynodon dactylon, Lolium perenne and Festuca arundinacea, respectively. To our knowledge, this is the first report of the identification of L. roseipellis as a pathogen of maize in China, and this report will assist with monitoring distribution of the disease to assist with developing management recommendations.

scholarly journals Identification and Mapping of Quantitative Trait Loci Conditioning Resistance to Southern Leaf Blight of Maize Caused by Cochliobolus heterostrophus Race O

2004 ◽  
Vol 94 (8) ◽  
pp. 862-867 ◽  
Author(s):  
M. L. Carson ◽  
C. W. Stuber ◽  
M. L. Senior
Keyword(s):  
Quantitative Trait Loci ◽  
Quantitative Trait ◽  
Leaf Blight ◽  
Chromosome 1 ◽  
Cochliobolus Heterostrophus ◽  
Phenotypic Variance ◽  
Polygenic Inheritance ◽  
Trait Loci ◽  
Southern Leaf Blight ◽  
Ri Lines

A random set of recombinant inbred (RI) lines (F2:7) derived from the cross of the inbred lines Mo17 (resistant) and B73 (susceptible) were evaluated for resistance to southern leaf blight (SLB) caused by Cochliobolus heterostrophus race O. The RI lines were genotyped at a total of 234 simple sequence repeat, restriction fragment length polymorphism, or isozyme loci. Field plots of the RI lines were inoculated artificially with an aggressive isolate of C. heterostrophus race O in each of two growing seasons in North Carolina. Lines were rated for percent SLB severity two (1996) or three (1995) times during the grain-filling period. Data also were converted to area under the disease progress curve (AUDPC) and analyzed using the composite interval mapping option of the PLABQTL program. When means of disease ratings over years were fitted to models, a total of 11 quantitative trait loci (QTLs) were found to condition resistance to SLB, depending upon which disease ratings were used in the analyses. When the AUDPC data were combined and analyzed over environments, seven QTLs, on chromosomes 1, 2, 3, 4, 7, and 10 were found to come from the resistant parent Mo17. An additional QTL for resistance on chromosome 1 came from the susceptible parent B73. The eight identified QTLs accounted for 46% of the phenotypic variation for resistance. QTL × environment interactions often were highly significant but, with one exception, were the result of differences in the magnitude of QTL effects between years and not due to changes in direction of effects. QTLs on the long arm of chromosome 1 and chromosomes 2 and 3 had the largest effects, were the most consistently detected, and accounted for most of the phenotypic variance. No significant additive × additive epistatic effects were detected. These data support earlier reports of the polygenic inheritance of resistance to SLB of maize.

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