Mycoplasma-like organisms as causal agents of potato purple top wilt in Queensland

Harding, RM; Teakle, D. S.

doi:10.1071/ar9850443

Cited by 17 publications

(10 citation statements)

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“…Nagaich and Giri (1973) reported that purple top roll of potato in India was tuber transmitted to 6-33% of plants grown from tubers produced on infected plants. Similarly, Harding and Teakle (1985) reported tuber transmission rates of about 32% in purple top wiltaffected potatoes.…”

Section: Discussionmentioning

confidence: 94%

“…In recent years, emerging phytoplasma diseases of potato (Solanum tuberosum L.) have increasingly become important in many potato producing areas around the world. In potatoes, diseases associated with phytoplasma infections include purple top, purple top wilt, potato witches'-broom, stolbur, aster yellows, and others (MacLeod 1954;Harding and Teakle 1985;Klein 2001;Wright 1952). Phytoplasmas in at least four different taxonomic groups have been identified on potatoes in Mexico (Santos-Cervantes et al 2010).…”

Section: Introductionmentioning

confidence: 98%

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Transmission of Potato Purple Top Phytoplasma to Potato Tubers and Daughter Plants

Hamlin

Buchman²,

Munyaneza³

2011

Am. J. Pot Res

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, and 2008 Russet, Shepody, and Umatilla Russet potatoes were planted at a research farm near Moxee, WA. Plants were allowed to become infested with native populations of the beet leafhopper which are known vectors of the Columbia Basin potato purple top phytoplasma, a member of phytoplasma group 16SrVI, in this region. Symptomatic plants were tested by PCR for the presence of the phytoplasma and positive plants were identified with flags. Tubers were harvested from positive plants and tested for the presence of phytoplasma. A subset of phytoplasmapositive tubers was planted in a greenhouse and the resulting daughter plants were tested for phytoplasma. The frequency of tuber transmission ranged from 4% to 96% among the eight cultivars over the 3 year period. Transmission of the phytoplasma from infected tubers to daughter plants ranged from 0% to 50% depending upon cultivar and year. In two of the 3 years, Russet Burbank showed the lowest rate of tuber transmission among the eight cultivars. Across the eight cultivars an average of 22%, 15%, and 16% of infected tubers gave rise to infected daughter plants in 2006, 2007, and 2008, respectively. Resumen Se plantaron en un campo experimental cerca de Moxee, WA, en 2006, 2007, y 2008, papas de las variedades Alturas, RussetBurbank, FL1867, FL 1879, RussetNorkotah, RangerRusset, Shepody y UmatillaRusset. Se permitió que las plantas se infestaran con poblaciones nativas de chicharritas del betabel, que se sabe son vectores del fitoplasma de la punta morada de la papa, miembro del grupo de fitoplasmas 16SrVI, en la región de la rivera del Columbia. A las plantas sintomáticas se les hizo la prueba de PCR para la presencia del fitoplasma, y a las positivas se les identificó con banderas. Se cosecharon los tubérculos de las plantas positivas y se probaron para la presencia del fitoplasma. Se plantó un subgrupo de tubérculos positivos en invernadero y las plantas resultantes se probaron para fitoplasmas. La frecuencia de transmisión por tubérculo tuvo una amplitud entre el 4 y el 96% entre las ocho variedades a lo largo del periodo de los tres años. La transmisión del fitoplasma de tubérculos infectados a plantas hijas varió de 0 a 50% dependiendo de la variedad y del año. En dos de los tres años, RussetBurbank mostró el nivel más bajo de transmisión por tubérculo entre las ocho variedades. Considerando todas las variedades, se obtuvo un promedio de 22%, 15% y 16% de tubérculos infectados que dieron origen a plantas hijas enfermas en 2006 a 2008, respectivamente.

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Section: Discussionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 98%

Transmission of Potato Purple Top Phytoplasma to Potato Tubers and Daughter Plants

Hamlin

Buchman²,

Munyaneza³

2011

Am. J. Pot Res

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“…Furthermore, disease occurrence in beans and tobacco could be minimised by targeting herbicide applications to TbYDV host plants such as A. retroflexus and R. raphanistrum that were commonly found in and around crops at the two most disease-affected sites. Apart from TbYDV, O. orientalis also transmits phytoplasmas which cause a range of economically important phytoplasma-associated diseases in Australia such as legume little leaf (Hutton & Grylls, 1956), tomato big bud (Hill & Mandryk, 1954;Osmelak, 1986), lucerne witches broom (Helson, 1951), potato purple top wilt (Grylls, 1979;Harding & Teakle, 1985) and Australian lucerne yellows (Pilkington et al, 2004). Therefore, the results from this study will possibly lead to effective control strategies for not only TbYDV but also phytoplasma diseases vectored by O. orientalis.…”

Section: Discussionmentioning

confidence: 99%

Vectors and alternative hosts of Tobacco yellow dwarf virus in southeastern Australia

Trębicki

Harding

Rodoni³

et al. 2010

Annals of Applied Biology

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Factors that determine the epidemiology of Tobacco yellow dwarf virus (TbYDV), including alternative host plants and insect vector(s), were assessed over three consecutive growing seasons at four field sites in Northeastern Victoria in commercial tobacco growing properties. In addition, these factors were assessed for one growing season at three bean growing properties. Overall, 23 leafhopper species were identified at the 7 sites, with Orosius orientalis as the predominant leafhopper. Of the leafhoppers collected, only O. orientalis and Anzygina zealandica tested positive for TbYDV by polymerase chain reaction (PCR). The population dynamics of O. orientalis was assessed using sweep net sampling over three growing seasons and a trimodal distribution was observed. Despite large numbers of O. orientalis occurring early in the growing season (September-October), TbYDV was only detected in these leafhoppers between late November and end of January. The peaks in the detection of TbYDV in O. orientalis correlated with the observation of disease symptoms in tobacco and bean and were associated with warmer temperatures and lower rainfall. Spatial and temporal distribution of vegetation at selected sites was determined using quadrat sampling. Of the 40 plant species identified, TbYDV was detected only in four dicotyledonous species, Amaranthus retroflexus, Phaseolus vulgaris, Nicotiana tabacum and Raphanus raphanistrum. The proportion of host and non-host availability for leafhoppers was associated with climatic conditions.

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“…On April 24, 2007, for each cultivar, 100 tubers were planted in 26-m 2 plots in a randomised complete block design with four replications. Twelve weeks after planting, all plants were visually inspected for symptoms of potato stolbur such as stunting, rolling or yellowing of upper leaflets, proliferation of axillary buds, formation of aerial tubers or swollen stems, cortical necrosis on lower stems, and sloughing of tissue and premature death (Harding and Teakle 1985;EPPO/CABI 1996). Three leaves of all symptomatic potato plants per replication from each cultivar were collected, stored in a cool box and subjected to PCR diagnosis using the primers fStol/rStol (Maixner et al 1995) to confirm stolbur phytoplasmal infections.…”

Section: Field Cultivar Screening Trialsmentioning

confidence: 99%

Impact of Stolbur Phytoplasmas on Potato Tuber Texture and Sugar Content of Selected Potato Cultivars

Lindner

Haase²,

Roman³

et al. 2011

Potato Res.

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Potato stolbur is a phytoplasmal disease that seriously affects yield and tuber quality in South Eastern Europe, Russia and the Mediterranean areas. In 2007 and 2008, field experiments were carried out to determine stolbur resistance of processing potato cultivars at Sannicolau Mare (Romania) by determining consistency and concentration of reducing sugars (fructose and glucose), sucrose and phytoplasmas in potato tubers. In both years, non-symptomatic potato tubers showed sucrose levels in the range of 3,000 mg kg −1 fresh weight (FW). In contrast, sucrose concentrations were up to 11,820 mg kg −1 FW in 2007 and 19,560 mg kg −1 FW in 2008 in tubers showing severe symptoms. These high values severely affect suitability of tubers for processing as sucrose serves as substrate for the formation of reducing sugars that are the limiting factor in fried potato production for Maillard-related discolouration. The cultivars examined differed considerably in susceptibility to stolbur disease. Whereas cvs. 'Courage' and 'Lady Rosetta' showed high numbers of diseased tubers and high sucrose concentrations, 'Lady Claire' had a lower incidence of symptomatic tubers and lower sucrose concentrations. However, fully resistant cultivars were not observed. Across all cultivars examined, phytoplasmal concentration was significantly higher in symptomatic tubers than in non-symptomatic ones.

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Mycoplasma-like organisms as causal agents of potato purple top wilt in Queensland

Cited by 17 publications

References 0 publications

Transmission of Potato Purple Top Phytoplasma to Potato Tubers and Daughter Plants

Transmission of Potato Purple Top Phytoplasma to Potato Tubers and Daughter Plants

Vectors and alternative hosts of Tobacco yellow dwarf virus in southeastern Australia

Impact of Stolbur Phytoplasmas on Potato Tuber Texture and Sugar Content of Selected Potato Cultivars

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