scholarly journals Systemic movement of Pseudomonas syringae pv actinidiae in kiwifruit vines in New Zealand

2014 ◽  
Vol 67 ◽  
pp. 41-47
Author(s):  
J.L. Tyson ◽  
C.L. Curtis ◽  
M.A. Manning ◽  
J. Rees-George ◽  
W.P. Snelgar ◽  
...  
Keyword(s):  
New Zealand ◽  
Pseudomonas Syringae ◽  
Actinidia Chinensis ◽  
Graft Union ◽  
Systemic Movement

Systemic movement of Pseudomonas syringae pv actinidiae (Psa) was investigated in inoculated potted kiwifruit vines in a greenhouse and in naturally infected mature vines in the orchard In the potted vine experiment trunks of 2yearold Actinidia chinensis Hort16A on the rootstock A deliciosa Bruno were woundinoculated with Psa After 151 days Psa was detected up to 95 cm from the point of inoculation Psa moved upwards and downwards within the trunks and through the scion and the rootstock at similar rates In the orchard experiments samples were taken from mature kiwifruit vines at intervals along the vines during autumn winter and spring Psa moved systemically throughout mature Hort16A and A deliciosa Hayward kiwifruit vines and was detected in symptomless tissues In both greenhouse and field situations Psa was not inhibited by the graft union and was able to move into the rootstock and down to the base of the vine

scholarly journals Insights into kiwifruit bud rot

2017 ◽  
Vol 70 ◽  
pp. 329
Author(s):  
M.S. Kabir ◽  
B.E. Parry ◽  
J.L. Tyson ◽  
M.A. Manning
Keyword(s):  
New Zealand ◽  
Pseudomonas Syringae ◽  
First Year ◽  
Actinidia Chinensis ◽  
Successful Management ◽  
Flower Buds ◽  
Detection Rates ◽  
Detailed Understanding ◽  
Lower Detection ◽  
Winter Buds

Bud rot caused by Pseudomonas syringae pv. actinidiae biovar 3 (Psa) is a severe issue for the kiwifruit industry in New Zealand, particularly within green-fleshed cultivars. Successful management of this disease requires a detailed understanding of the disease cycle, such as identifying when and where Psa is present in/on winter- and flower-buds, the timing of bud-rot initiation, incidence and progression, and any varietal/seasonal/environmental differences. Relevant data is being collected on two green-fleshed cultivars: Actinidia chinensis var. deliciosa ‘Hayward’ and A. chinensis var. chinensis x A. chinensis var. deliciosa ‘Zesh004’ (commonly known as Green14), at four sites where bud rot had been noticed previously. Winter buds are sampled fortnightly and flower buds are sampled weekly from each site. Results from the first year, 2016, indicate that bud-rot incidence was higher in ‘Hayward’ than in Green14. Psa was detected in dormant and sprouted winter buds but its presence was inconsistent. Psa was detected in all parts of dissected ower buds, with the highest incidence in sepals, then in stalks, and gradually lower detection rates in petals, anthers and ovaries respectively.

Pseudomonas syringae pv. actinidiae. [Distribution map].

2012 ◽  
Author(s):  
Keyword(s):  
New Zealand ◽  
South America ◽  
Geographical Distribution ◽  
Pseudomonas Syringae ◽  
Actinidia Chinensis ◽  
Distribution Map ◽  
New Distribution ◽  
Distribution In Europe

Abstract A new distribution map is provided for Pseudomonas syringae pv. actinidiae Takikawa et al. Hosts: Chinese gooseberry (Actinidia chinensis), kiwifruit (A. deliciosa), tara vine (A. arguta) and kolomikta vine (A. kolomikta). Information is given on the geographical distribution in Europe (Mainland France and Corsica, France; Italy; Portugal; Spain; and Switzerland), Asia (Anhui, Shaanxi, Shanxi and Sichuan, China; Hokkaido, Honshu, Kyushu and Shikoku, Japan; Korea Republic; and Turkey), South America (Chile) and Oceania (Victoria, Australia, and New Zealand).

Effect of a protectant copper application on Psa infection of kiwifruit trap plants

2017 ◽  
Vol 70 ◽  
pp. 310-314
Author(s):  
J.L. Tyson ◽  
S.J. Dobson ◽  
M.A. Manning
Keyword(s):  
New Zealand ◽  
Disease Control ◽  
Pseudomonas Syringae ◽  
Low Risk ◽  
Bacterial Canker ◽  
Complete Protection ◽  
Leaf Spots ◽  
Copper Compounds ◽  
Trap Plants

Pseudomonas syringae pv. actinidiae (Psa) causes bacterial canker of kiwifruit, which is an ongoing threat to New Zealand kiwifruit production. Disease control depends on orchard practices such as removal of visibly diseased material, pruning during low-risk periods, and the application of foliar bactericides. Although the use of copper compounds on Actinidia species (kiwifruit) can cause phytotoxicity, copper-based formulations remain a key component of Psa control in New Zealand. The effect of single copper applications on Psa infection of ‘Hort16A’ trap plants was studied over the Spring of 2014 (Sept—Nov). Psa leaf spots were observed at the beginning of October, appearing first on the untreated plants. Although the copper sprays did not achieve complete protection, particularly as the inoculum built up during November, the copper-sprayed plants always had less disease than the untreated plants.

Pseudomonas syringae pv. pisi. [Distribution map].

1993 ◽  
Author(s):  
Keyword(s):  
South Africa ◽  
New York ◽  
New Zealand ◽  
Pisum Sativum ◽  
Pseudomonas Syringae ◽  
New South ◽  
South Australia ◽  
Distribution Map ◽  
South Wales ◽  
New Distribution

Abstract A new distribution map is provided for Pseudomonas syringae pv. pisi (Sackett) Young, Dye & Wilkie. Hosts: Pea (Pisum sativum) and other Apiaceae. Information is given on the geographical distribution in Africa, Kenya, Malawi, Morocco, South Africa, Tanzania, Zimbabwe, Asia, India, Rajasthan, Himachal Pradesh, Indonesia, Israel, Japan, Lebanon, Nepal, Pakistan, Russia, Armenia, Kirghizistan, Australasia & Oceania, Australia, New South Wales, South Australia, Western Australia, Queensland, Tasmania, Victoria, New Zealand, Europe, Bulgaria, Denmark, France, Germany, Greece, Hungary, Italy, Netherlands, Romania, Russia, Ukraine, Voronezh, Moldavia, Switzerland, UK, England, Yugoslavia, North America, Bermuda, Canada, Alberta, British Columbia, Manitoba, Ontario, Quebec, Saskatchewan, Mexico, USA, New York, South America, Argentina, Colombia, Uruguay.

Pseudomonas syringae pv. coronafaciens. [Distribution map].

1987 ◽  
Author(s):  
Keyword(s):  
New Zealand ◽  
North America ◽  
South America ◽  
Geographical Distribution ◽  
Pseudomonas Syringae ◽  
Western Australia ◽  
Distribution Map ◽  
Irish Republic ◽  
New Distribution

Abstract A new distribution map is provided for Pseudomonas syringae pv.coronafaciens (Elliott) Young, Dye & Wilkie. Hosts: Oats (Avena). Information is given on the geographical distribution in Africa, Ethiopia, Kenya, Zimbabwe, Asia, Japan, USSR, Uzbekistan, Siberia, Australasia, Australia, Western Australia, New Zealand, Europe, Denmark, Germany, Irish Republic, Norway, Poland, Romania, UK, Yugoslavia, North America, Canada, Alberta, Manitoba, Quebec, Mexico, USA, South America, Argentina, Chile.

Pseudomonas syringae pv. passiflorae. [Distribution map].

1996 ◽  
Author(s):  
Keyword(s):  
South Africa ◽  
New Zealand ◽  
Geographical Distribution ◽  
Pseudomonas Syringae ◽  
Western Australia ◽  
Passion Fruit ◽  
Distribution Map ◽  
Passiflora Edulis ◽  
New Distribution

Abstract A new distribution map is provided for Pseudomonas syringae pv. passiflorae (Reid) Young, Dye & Wilkie. Hosts: Passion fruit (Passiflora edulis). Information is given on the geographical distribution in Africa, South Africa, Natal, Australasia, Australia, Western Australia, New Zealand.

scholarly journals Draft Genome Resources Sequences of Six Pseudomonas syringae pv. actinidiae Strains Isolated from Actinidia chinensis var. deliciosa Leaves in Portugal

2020 ◽  
pp. PHYTO-05-20-018
Author(s):  
Aitana Ares ◽  
Marta Tacão ◽  
Daniela Figueira ◽  
Eva Garcia ◽  
Joana Costa
Keyword(s):  
Genetic Diversity ◽  
Pseudomonas Syringae ◽  
Draft Genome ◽  
Clonal Expansion ◽  
Average Nucleotide Identity ◽  
Actinidia Chinensis ◽  
Valuable Resource ◽  
Genetic Population ◽  
Evolutionary Studies ◽  
Reference Strains

Pseudomonas syringae pv. actinidiae is a quarantine bacterium affecting all the Portuguese main areas of kiwifruit production. We report the draft genome of six P. syringae pv. actinidiae strains isolated from symptomatic leaves of Actinidia chinensis var. deliciosa in a study that determined the genetic population structure of the endophytic and epiphytic populations in two consecutive seasons. Average nucleotide identity values were above 99% similarity with reference strains from P. syringae pv. actinidiae biovar 3. The genomic differences found between these strains confirm the genetic diversity described for P. syringae pv. actinidiae population in Portugal. Furthermore, data provide evidence that the initial clonal expansion of P. syringae pv. actinidiae in Europe was followed by a genomic diversification constituting a valuable resource for epidemiological and evolutionary studies, namely when adopting strategies for epidemics management.

scholarly journals An Anatomical Study of Prune Brown Line Disease and Immuno-localization of Tomato Ringspot Virus in Plum Bark

Plant Disease ◽  
1997 ◽  
Vol 81 (8) ◽  
pp. 855-861 ◽  
Author(s):  
K. V. Kommineni ◽  
D. C. Ramsdell
Keyword(s):  
Protein A ◽  
Anatomical Study ◽  
Wound Response ◽  
Ringspot Virus ◽  
Graft Union ◽  
Systemic Movement ◽  
Tomato Ringspot Virus ◽  
Living Tissues ◽  
Plum Tree ◽  
Wound Tissue

Bark from the graft union of tomato ringspot virus (ToRSV) infected plum, symptomatic for brown line disease, showed anatomical changes characteristic of the wound response process. The wound tissue consisted of necrotic cells demarcated by pinkish purple necrophylactic periderm, whose function is to protect living tissues from detrimental effects associated with necrosing cells. However, formation of gray exophylactic periderm led to the sloughing off of the wound tissue and the necrophylactic periderm, resulting in discontinuity of the exophylactic periderm and secondary virus invasion into the wound site. The changes seen in the bark suggest that the hypersensitive response in plum rootstock bark to ToRSV is slow, allowing a systemic movement of the virus and development of a brown line (BL) along the scion and rootstock union. Necrophylactic periderm was not seen in the bark from the graft union of a healthy plum tree. In the graft union of a plum tree without a BL, but testing ToRSV-positive in the roots, localized areas of wound tissue with pinkish purple necrophylactic periderm developed only in the rootstock portion of the tree. Silver-enhanced protein A-colloidal gold immunolabeling was seen on the cell wall and in the cytoplasm of bark tissue from the BL region of scion and rootstock and leaves from the rootstock suckers.

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