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Figure 1:
Regressions to show the relationship between root biomass and log (nematodes per g of roots) in nine nematode trials.
Figure 2:
Regressions to show the relationship between shoot biomass and log (nematodes per g of roots) in seven nematode trials.
Pearson correlation coefficients among 15 accession lines to measure the repeatability among trials in relation to shoot and root biomass, and nematode resistance parameters.
Trial
By Trial
No. accessions commona
Shoot biomass
Root biomass
Nematodes/plant
Nematode/g root
Nep11-1
Nep12-1
8
‒0.15
‒0.52
0.45
‒0.01
Nep11-1
Nep13-1
7
0.36
‒0.84*
0.78*
‒0.35
Nep11-1
Nep14-1
8
‒0.17
0.19
0.33
0.38
Nep11-1
Nep16-2
8
–
‒0.24
0.38
‒0.53
Nep11-1
Nep17-1
6
0.56
‒0.69
0.57
‒0.52
Nep11-1
Nep18-1
8
0.51
‒0.11
‒0.1
0.45
Nep11-1
WFLN19-01
8
0.2
‒0.49
‒0.24
‒0.85**
Nep12-1
Nep13-1
9
0.69*
0.56
0.86**
0.79**
Nep12-1
Nep14-1
8
0.63
0.2
0.69
0.78*
Nep12-1
Nep16-2
8
–
0.57
0.75*
0.75*
Nep12-1
Nep17-1
6
0.1
0.56
0.97***
0.95**
Nep12-1
Nep18-1
8
0.52
‒0.5
0.7
0.59
Nep12-1
WFLN19-01
8
0.13
0.86**
0.7
0.77*
Nep13-1
Nep14-1
9
0.28
0.27
0.51
0.51
Nep13-1
Nep16-2
7
–
0.56
0.9**
0.74
Nep13-1
Nep17-1
5
0.12
0.2
0.89*
0.72
Nep13-1
Nep18-1
6
0.25
0
0.42
0.12
Nep13-1
WFLN19-01
6
0.63
0.47
0.45
0.44
Nep14-1
Nep16-2
9
–
0.86**
0.58
0.6
Nep14-1
Nep17-1
6
0.25
0.47
0.47
0.38
Nep14-1
Nep18-1
6
0.8
0.75
0.42
0.56
Nep14-1
WFLN19-01
7
0.13
0.61
0.4
0.01
Nep16-2
Nep17-1
7
–
0.72
0.91**
0.93**
Nep16-2
Nep18-1
8
–
0.3
‒0.02
‒0.1
Nep16-2
WFLN19-01
9
–
0.64
0.38
0.29
Nep17-1
Nep18-1
8
0.68
0.28
0.82*
0.75*
Nep17-1
WFLN19-01
9
0.58
0.81**
0.87**
0.85**
Nep18-1
WFLN19-01
10
0.09
0.16
0.89**
0.71*
List of 15 sugarcane accession lines used in multiple trials with root biomass, and nematode resistance parameters.
Accession
Type
No. of trialsa
Shoot biomass
Root biomass
Relative nematodes/plante
Relative nematodes/g root
IJ76-333
Erianthus sp.b
5
15.6abd
46.7ab
89.5f
74.0c
IJ76-370
Erianthus sp.
4
10.3b
53.8a
88.0f
67.3c
IJ76-388
Erianthus sp.
4
14.9ab
41.3abc
87.2f
72.7c
KQ228
Core
7
17.8ab
32.7abcd
95.3cde
91.2b
Q135c
Core
9
16.1ab
25cd
100.6a
101.8a
Q138
Core
6
15.9ab
28.4bcd
99.3abc
98.7ab
Q183
Core
4
15.0ab
24.6bcd
101.1ab
95.9ab
Q200
Core
7
15.5ab
17.4d
96.2bcd
98.3ab
Q208ac
Core
9
16.7ab
28.4bcd
99.3ab
98.3ab
Q232
Core
7
21.1a
28.9bcd
94.3de
90.5b
Q240
Core
5
17.9ab
33.6abcd
99.9abc
94.3ab
Q245
Core
6
17.1ab
26.6bcd
99.4abc
97.8ab
QBYC06-30376
Introgression
4
14.6ab
30.9abcd
92.1def
87.5b
QBYC06-30390
Introgression
4
14.2ab
20.3cd
90.4ef
89.6b
QBYN05-20563
Introgression
4
19.2ab
21.6cd
91.9def
90.2b
Coefficient of variance (%) among shoot biomass, root biomass, number of nematodes per plant and number of nematodes per g of roots in each trial.
Trial name
Shoot biomass
Root biomass
Nematodes/plant
Nematodes/g root
WFLN19-01
17.3
36.1
3.2
7.9
Nep18-1
20.0
30.9
5.4
17.6
Nep17-1
15.9
39.6
3.4
7.9
Nep16-1
–
38.5
4.1
8.5
Nep16-2
–
38.9
3.7
9.0
Nep14-1
25.7
44.1
4.5
8.1
Nep13-1
31.0
34.6
4.3
6.9
Nep12-1
26.6
36.5
5.7
8.7
Nep11-1
34.5
56.9
3.2
5.9
Trial codes, trial year, number of test lines and types of sugarcane population screened for root-lesion nematodes (Pratylenchus zeae) for resistance from 2011 to 2020.
Trial code
Year
Total
Remarks
WFLN19-01
2020
42
Core breeding program
Nep18-1
2018
55
Core breeding program
Nep17-1
2017
56
Core breeding program
Nep16-1
2016
60
Introgression population
Nep16-2
2016
86
Introgression population
Nep14-1
2014
157
Introgression population
Nep13-1
2013
153
Introgression population
Nep12-1
2012
148
Introgression population
Nep11-1
2011
118
Introgression population
Total
875
Pearson correlation coefficients to compare the relationship of number of root-lesion nematodes per plant and number of nematodes per g of roots with shoot biomass and root biomass.
