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Biology, pathotype, and virulence of Globodera rostochiensis populations from Kenya

James M. Mwangi
James M. Mwangi
, 
Grace N. Mwangi
Grace N. Mwangi
, 
Maria R. Finckh
Maria R. Finckh
 y 
Sebastian Kiewnick
Sebastian Kiewnick
   | 01 ene 2021
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Publicado en línea: 01 ene 2021
Páginas: 1 - 3
DOI: https://doi.org/10.21307/jofnem-2021-003
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© 2021 Authors, published by Sciendo.
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Figure 1:

Figure showing the mean number of different developmental stages of Globodera rostochiensis, ‘HAR1’ and ‘Ecosse’ populations in resistant cv. ‘Laura’ and susceptible cv. ‘Désirée’ in the glasshouse during the first experiment.
Figure showing the mean number of different developmental stages of Globodera rostochiensis, ‘HAR1’ and ‘Ecosse’ populations in resistant cv. ‘Laura’ and susceptible cv. ‘Désirée’ in the glasshouse during the first experiment.

Figure 2:

Figure showing the mean number of different developmental stages of Globodera rostochiensis, of ‘HAR1’ and ‘Ecosse’ populations in resistant cv. ‘Laura’ and susceptible cv. ‘Désirée’ in the glasshouse in the second experiment.
Figure showing the mean number of different developmental stages of Globodera rostochiensis, of ‘HAR1’ and ‘Ecosse’ populations in resistant cv. ‘Laura’ and susceptible cv. ‘Désirée’ in the glasshouse in the second experiment.

Figure 3:

Mean reproduction factor (±SE) of six populations of Globodera rostochiensis from Kenya on the susceptible cultivar ‘Désirée’ for three successive generations without diapause. Vertical bars show the standard error of the mean (n  = 6). Means within a population with the same small letter are not significantly different (p > 0.05).
Mean reproduction factor (±SE) of six populations of Globodera rostochiensis from Kenya on the susceptible cultivar ‘Désirée’ for three successive generations without diapause. Vertical bars show the standard error of the mean (n  = 6). Means within a population with the same small letter are not significantly different (p > 0.05).

Figure 4:

Percentage hatch of Globodera rostochiensis ‘HAR1’ population in PRD for three successive generations of cysts without diapause. Vertical bars are mean percentage ± standard error (n = 4).
Percentage hatch of Globodera rostochiensis ‘HAR1’ population in PRD for three successive generations of cysts without diapause. Vertical bars are mean percentage ± standard error (n = 4).

Response of seven potato cultivars to four populations of Globodera rostochiensis under greenhouse conditions.

Cultivar ‘Ecosse’ ‘HAR2’ ‘KIN1’ ‘TGN’
Experiment 1
‘Désirée’ 28.43d ± 12.0a,A 14.73 ± 9.6a,B 24.97 ± 10.5a,A 37.27 ± 22.7a,A
‘Connect’ 31.70 ± 9.3a,A 18.43 ± 5.2a,B 30.84 ± 15.3a,A 21.80 ± 9.4a,A
‘Performer’ 2.37 ± 1.3b,A 1.74 ± 1.3bA,B 2.45 ± 1.9b,AB 1.18 ± 0.9b,B
‘Rossini’ 0.02 ± 0.1c 0.00 ± 0.0c 0.00 ± 0.0c 0.01 ± 0.0c
‘Caruso’ 0.02 ± 0.1c 0.00 ± 0.0c 0.00 ± 0.0c 0.02 ± 0.1c
‘Amanda’ 0.00 ± 0.0c 0.01 ± 0.0c 0.02 ± 0.1c 0.05 ± 0.1c
‘Laura’e 0.00 ± 0.0 0.00 ± 0.0 0.00 ± 0.0 0.00 ± 0.0
Experiment 2
 ‘Désirée’ 10.07 ± 1.5a,A 8.11 ± 1.5a,A 3.53 ± 0.3a,B 12.92 ± 0.8a,A
 ‘Connect’ 7.47 ± 1.1a,A 13.31 ± 1.9a,A 2.42 ± 0.3a,B 12.25 ± 2.7a,A
 ‘Performer’ 0.53 ± 0.1b,AB 0.35 ± 0.1b,B 0.85 ± 0.2b,A 1.00 ± 0.3b,A
 ‘Rossini’ 0.00 ± 0.0c 0.00 ± 0.0c 0.04 ± 0.1c 0.01 ± 0.0c
 ‘Caruso’ 0.00 ± 0.0c 0.08 ± 0.3c 0.00 ± 0.0c 0.02 ± 0.1c
 ‘Amanda’ 0.00 ± 0.0c 0.00 ± 0.0c 0.00 ± 0.0c 0.05 ± 0.0c
 ‘Laura’e 0.00 ± 0.0 0.00 ± 0.0 0.00 ± 0.0 0.00 ± 0.0

Response of seven potato cultivars to ‘HAR1’ and ‘Ecosse’ populations of Globodera rostochiensis under glasshouse conditionsa.

‘HAR1’ ‘Ecosse’
Cultivars Rf ± se RS (%) Score Rf ± se RS (%) Score
‘Désirée’ 56.56 ± 8.51* 100 1 51.07 ± 4.37* 100 1
‘Albatros’ 0.09 ± 0.07 0.16 9 0.02 ± 0.02 0.04 9
‘Belana’ 0.10 ± 0.05 0.18 9 0.00 ± 0.00 0.00 9
‘Ribera’ 0.08 ± 0.03 0.14 9 0.00 ± 0.00 0.00 9
‘Amado’ 0.00 ± 0.00 0.00 9 0.00 ± 0.00 0.00 9
‘Seresta’ 0.00 ± 0.00 0.00 9 0.00 ± 0.00 0.00 9
‘Papageno’ 0.01 ± 0.02 0.02 9 0.00 ± 0.00 0.00 9

The reproduction factor (Rf) of Globodera rostochiensis populations ‘HAR1’ and ‘Ecosse’ on six differential potato clonesa.

Population Statusc
Potato clones Resistanceb ‘HAR1’ ‘Ecosse’ ‘HAR1’ ‘Ecosse’
S. tuberosum cv. ‘Désirée’ None 61.4 46.6 + +
S. tuberosum cv. ‘Laura’ Ro1,4 0.0 0.0 – –
S. kurtzianum, 60.21.19 Ro1,2 1.1 0.4 + –
S. vernei, 58.1642.4 Ro1,2,3 0.1 0.1 – –
S. vernei, 62.33.3 Ro1,2,3,4 3.2 2.4 + +
S. vernei, 65.346.19 Ro1,2,3,4,5 0.0 0.0 – –

Mean relative susceptibility (Rs %) of six potato cultivars to four G. rostochiensis populations: ‘Ecosse’, ‘HAR2’, ‘KIN1’, and ‘TGN’a.

‘Ecosse’ ‘HAR2’ ‘KIN1’ ‘TGN’
Cultivar Rs (%)a Score Rs (%) Score Rs (%) Score Rs (%) Score
‘Connect’ 92.9 2 144.6 1 96.1 2 76.7 2
‘Performer’ 6.8 6 8.1 6 17.0 4 5.5 6
‘Rossini’ 0.1 9 0.0 9 0.6 9 0.1 9
‘Caruso’ 0.1 9 0.5 9 0.0 9 0.2 9
‘Amanda’ 0.0 9 0.1 9 0.1 9 0.3 9
‘Laura’b 0.0 9 0.0 9 0.0 9 0.0 9
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