Lentisone, a New Phytotoxic Anthraquinone Produced by Ascochyta lentis, the Causal Agent of Ascochyta Blight in Lens culinaris

2013 ◽  
Vol 61 (30) ◽  
pp. 7301-7308 ◽  
Author(s):  
Anna Andolfi ◽  
Alessio Cimmino ◽  
Angel M. Villegas-Fernández ◽  
Angela Tuzi ◽  
Antonello Santini ◽  
...  
Keyword(s):  
Lens Culinaris ◽  
Ascochyta Blight ◽  
Causal Agent ◽  
Ascochyta Lentis

scholarly journals Defense responses of lentil (Lens culinaris) genotypes carrying non-allelic ascochyta blight resistance genes to Ascochyta lentis infection

PLoS ONE ◽  
2018 ◽  
Vol 13 (9) ◽  
pp. e0204124 ◽  
Author(s):  
Ehsan Sari ◽  
Vijai Bhadauria ◽  
Larissa Ramsay ◽  
M. Hossein Borhan ◽  
Judith Lichtenzveig ◽  
...  
Keyword(s):  
Resistance Genes ◽  
Lens Culinaris ◽  
Ascochyta Blight ◽  
Defense Responses ◽  
Blight Resistance ◽  
Ascochyta Lentis

scholarly journals First Report of Lentil Ascochyta Blight Caused by Ascochyta lentis in Italy

Plant Disease ◽  
1999 ◽  
Vol 83 (1) ◽  
pp. 77-77
Author(s):  
C. Cappelli ◽  
R. Buonaurio ◽  
R. Torricelli
Keyword(s):  
Lens Culinaris ◽  
Ascochyta Blight ◽  
Central Italy ◽  
Morphological Characteristics ◽  
Potato Dextrose Agar ◽  
Conidial Suspension ◽  
First Report ◽  
Ascochyta Lentis ◽  
Humidity Chamber ◽  
Dry Conditions

In May 1997, ascochyta blight incited by Ascochyta lentis Vassiljevsky was observed at an incidence of less than 5% in lentil (Lens culinaris Medik.) fields in Umbria (Central Italy). Symptoms appeared on leaves and stems as tan spots surrounded by a dark margin. Small black pycnidia that produced a pink exudate containing hyaline, 1 septate, 14.2 to 15.8 × 3.5 μm conidia under high humidity were visible in the center of the spots. The fungus was consistently isolated on potato dextrose agar from diseased leaves or stems. To satisfy Koch's postulates, a conidial suspension (106 conidia per ml) of the fungus was sprayed on leaves of 20-day-old lentil plants (landrace Castelluccio) that were maintained in a humidity chamber for 96 h after inoculation. Lesions resembling symptoms that occurred in the field were observed on plants 3 weeks after inoculation. Symptoms were not observed on control plants sprayed with water. The fungus reisolated from the diseased plants was identical to the original isolates. Based on morphological characteristics of pycnidia and conidia as well as pathogenicity, the fungus was identified as A. lentis. A deep-freeze blotter method (2) was used to detect A. lentis in lentil seeds of 20 local landraces used by Umbrian farmers and two accessions from Canada and Turkey, as well as in seed collected from infected fields. The fungus was present only in the two lentil accessions with an incidence of about 5%. Although the fungus had been isolated from Italian seed germplasm in 1986 (1), this is the first report of ascochyta blight occurring in lentil crops in Italy. The heavy rainfalls that characterize the first stage of lentil cultivation in Umbria are favorable for disease development while hot and dry conditions that usually occur during flowering and maturation prevent the dissemination of inoculum and the infection of the seeds. For these reasons, some Umbrian areas could be more suitable for production of ascochyta-free lentil seeds. References: (1) W. J. Kaiser and R. M. Hannan. Phytopathology 76:355, 1986. (2) T. Limonard. Proc. Int. Seed Test. Assoc. 33:343, 1968.

Screening of wild and cultivated lentil germplasm for resistance to stemphylium blight

2012 ◽  
Vol 11 (1) ◽  
pp. 26-35 ◽  
Author(s):  
Rajib Podder ◽  
Sabine Banniza ◽  
Albert Vandenberg
Keyword(s):  
Lens Culinaris ◽  
Ascochyta Blight ◽  
Severity Scores ◽  
Ascochyta Lentis ◽  
Stemphylium Blight ◽  
Cultivated Species ◽  
Lens Nigricans ◽  
Wild Lentil ◽  
Potential Use ◽  
Disease Severity Scores

Lens culinaris Medik. ssp. culinaris is the only cultivated species in the genus Lens. Intensive selection pressure to develop new cultivars, a narrow genetic base, co-evolution of pathogens to partially resistant cultivars and other factors have accelerated susceptibility to different fungal diseases in this species. Few sources for resistance to stemphylium blight (SB) caused by Stemphylium botryosum Wallr. exist among commercial lentil cultivars. A total of 70 accessions were selected from seven species of the genus Lens to screen for SB resistance. The L. culinaris accessions were screened in four different environments, and the accessions of Lens ervoides, L. culinaris ssp. orientalis, Lens tomentosus,Lens nigricans, Lens odemensis and Lens lamottei in growth chamber or greenhouse experiments to identify resistance sources for potential use in lentil breeding. A highly aggressive isolate of SB was used as an inoculum to screen them under controlled conditions. Lentil cultivars ‘Eston’ (resistant) and ‘CDC Glamis’ (susceptible) were used as checks with consistent results in all experiments. Most of the L. culinaris accessions were susceptible to SB, whereas more than 70% of the wild lentil accessions had disease severity scores equal to or significantly lower than that of the SB-resistant check ‘Eston’. Some wild species accessions previously identified with resistance to anthracnose (Colletotrichum truncatum) and ascochyta blight (Ascochyta lentis) were also highly resistant to SB. The highest frequency of resistance to SB was found in L. lamottei followed by L. ervoides of the secondary gene pool. These sources can potentially be used to develop new commercial cultivars with multiple or single disease resistance.

CDC Milestone lentil

2001 ◽  
Vol 81 (1) ◽  
pp. 113-114 ◽  
Author(s):  
A. Vandenberg ◽  
F. A. Kiehn ◽  
C. Vera ◽  
R. Gaudiel ◽  
L. Buchwaldt ◽  
...  
Keyword(s):  
Lens Culinaris ◽  
Ascochyta Blight ◽  
Western Canada ◽  
Crop Development ◽  
Ascochyta Lentis ◽  
Cultivar Description ◽  
Canadian Food Inspection Agency ◽  
Production Areas ◽  
Pale Green ◽  
Yield Trials

CDC Milestone is a high-yielding, yellow cotyledon lentil (Lens culinaris Medik.) cultivar developed by the Crop Development Centre, Saskatoon, Saskatchewan. It is intended for cultivation in all lentil production areas of western Canada. CDC Milestone was evaluated for yield, resistance to ascochyta blight (Ascochyta lentis Vassilievsky) and agronomic performance as breeding line 512-2 in the Lentil Co-operative Yield Trials in 1995 and 1996. It has small seeds with pale green seed coat and is acceptable in the small green market class of lentil. CDC Milestone was granted official registration (#4836) as a cultivar in Canada by the Variety Section, Plant Health and Plant Products Division, Canadian Food Inspection Agency on 8 December 1998. Key words: Lentil, cultivar description, Lens culinaris

Biochemical Basis of Resistance in Lentil (Lens culinaris Medik.) Against Ascochyta Blight: I Phenols

2000 ◽  
Vol 3 (7) ◽  
pp. 1141-1143 ◽  
Author(s):  
S.T. Sahi ◽  
M. A. Randhawa . ◽  
Nighat Sarwar . ◽  
S.M. Khan .
Keyword(s):  
Lens Culinaris ◽  
Ascochyta Blight ◽  
Biochemical Basis

Impact of tillage and crop rotation on ascochyta blight (Ascochyta lentis) of lentil

2003 ◽  
Vol 83 (2) ◽  
pp. 411-415 ◽  
Author(s):  
B. D. Gossen ◽  
D. A. Derksen
Keyword(s):  
Crop Rotation ◽  
Seed Quality ◽  
Block Design ◽  
Ascochyta Blight ◽  
Conventional Tillage ◽  
Crop Species ◽  
Ascochyta Lentis ◽  
Main Plot ◽  
The Impact ◽  
Rotation Study

Two trials were conducted from 1996 to 1999; one at Indian Head, SK, to examine the impact of tillage management on the severity of ascochyta blight of lentil, caused by Ascochyta lentis (teleomorph Didymella lentis), and a second at Saskatoon, SK, to assess the impact of crop rotation. In 1995, the blight-susceptible lentil cv. Eston was seeded across both sites and later inoculated with blight-infested lentil residue to provide a uniform level of infection. Treatments were initiated in the spring of 1996. Ascochyta blight severity was assessed on each lentil plot during the growing season. Seed quality and yield were assessed each year. A split-block design was used to minimize movement of inoculum among plots over years. In the tillage management trial at Indian Head, the main plot treatments were 0, 1, or 2 yr between lentil crops, with spring wheat as the alternate crop; the subplot treatments were zero-till vs. conventional tillage. Ascochyta blight severity was substantially higher under zero-till than under conventional tillage in the continuous lentil treatment when conditions were conducive to blight development. However, tillage management had little effect on severity when there were 2 yr between successive lentil crops. We conclude that tillage management is unlikely to have an important impact on blight severity, except in rotations with short re-cropping intervals. In the crop rotation study at Saskatoon, the main plot treatments were two rotation sequences and the subplot treatments were three crop species (canola, barley, pea) planted in 1996. Rotation 1 was seeded to cv. Eston in 1997 and barley in 1998; Rotation 2 was seeded to barley in 1997 and cv. Eston in 1998. Both rotations were seeded to cv. Eston in 1999. Also, a plot seeded continuously to cv. Eston was included at one end of each replicate block as a control. Blight was more severe in continuous lentil than in the other crop rotations, and ascochyta blight levels in 1999 were lowest where barley followed the 1996 lentil crop for both Rotation 1 and 2. However, the intervening nonhost crop had little impact on seed infection or seed yield. We conclude that at least two nonhost crops between successive lentil crops are required to substantially reduce inoculum of A. lentis following a disease outbreak. Key words: Didymella lentis, zero-till management, fusarium root rot, Lens culinaris, barley, canola, field pea

Host range investigation of Phoma koolunga, a causal agent of ascochyta blight of field pea

2020 ◽  
Vol 49 (6) ◽  
pp. 707-719
Author(s):  
E. C. Keirnan ◽  
J. A. Davidson ◽  
R. L. Correll ◽  
E. S. Scott
Keyword(s):  
Host Range ◽  
Ascochyta Blight ◽  
Causal Agent ◽  
Field Pea ◽  
Phoma Koolunga
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