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International Journal of Horticulture 2014, Vol.4, No.11, 53
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Table 2 Correlation coefficient (r) estimates between PDI at different physiological growth stages and various physiological
components of rust resistance
Characters
PDI at different physiological growth stages.
Seedling (20
DAS)
Flowering (30
DAS)
Pod formation (40
DAS)
Pod maturity (50
DAS)
Seed development
(60 DAS)
Stomata count (no.)
Upper
0.918**
0.940**
0.950**
0.926**
0.928**
Lower
0.986**
0.984**
0.980**
0.983**
0.983**
Stomata size (
m)
Length
0.936**
0.936**
0.932**
0.929**
0.926**
Breadth
0.971**
0.967**
0.961**
0.969**
0.968**
Stomata pore size (
m) Length
0.994**
0.996**
0.995**
0.997**
0.997**
Breadth
0.972**
0.959**
0.949**
0.968**
0.965**
Note: ** Significant at 1% level; All computed values are positive
Table 3 Correlation coefficient (r) estimates between rate of infection at different physiological growth stages with various
physiological components of rust resistance
Characters
Rate of infection at different physiological growth stages.
Seedling to
flowering
Flowering to pod
formation
Pod formation to pod
maturity
Pod maturity to seed
development
Stomata count (no.)
Upper
0.9788** 0.9714**
0.7435**
0.9778**
Lower
0.8941** 0.8888**
0.9158**
0.9545**
Stomata size (
m)
Length
0.8756** 0.8592**
0.8589**
0.9180**
Breadth
0.8567** 0.8570**
0.9153**
0.9276**
Stomata pore size (
m)
Length
0.9092** 0.9131**
0.9096**
0.9709**
Breadth
0.8002** 0.8042**
0.9567**
0.8951**
Note: ** Significant at 1% level; All computed values are positive
Table 4 Correlation coefficient estimates between various physiological components of rust resistance withAUDPC and contingency analysis
Characters
Correlation coefficient (r) with AUDPC
2
Value
Stomata count (no.)
Upper
+0.9330**
10.39**
Lower
+0.9840**
19.28**
Stomata size (
m)
Length
+0.9320**
11.68**
Breadth
+0.9680**
14.11**
Stomata pore size (
m)
Length
+0.9970**
21.54**
Breadth
+0.9630**
13.15**
Note: ** Significant at 1% level
Figure 2 Correlation coefficient estimates between various
physiological components of rust resistance with AUDPC and
contingency analysis
2
contingency results indicated the existence of
association of physiological components with AUDPC,
among the significant components, the level of
significance was higher for stomatal count (upper and
lower), stomatal size (length and width) and stomatal
pore size (length and width).
Discussion
The studies on number of stomata in resistant and
susceptible parents and F
1
have revealed significant
difference. However, parents IC
-
525236 and Arka
Anoop had considerably lower number of stomata
both on upper surface (11.50~11.56) and lower surface
(38.00~41.00). While susceptible parents recorded
fairly higher number of stomata on both surfaces
i.e.,
upper (15.20~17.10) and lower (59.30~63.30). As
Uromyces phaseoli
enters through the stomata, it was
possible to infer that the lower stomata number in