Basic HTML Version
International Journal of Horticulture 2014, Vol.4, No.11, 53
-
57
http://ijh.biopublisher.ca
53
Research Report Open Access
Physiological Basis of Rust Resistance in French Bean (
Phaseolus Vulgaris
)
B. Divya , T. S. Aghora , A. Rekha , H.P. Sudeep , B. N. Radha
College of Horticulture, GKVK, Bengaluru- 560 065, University of Horticultural sciences, Bagalkot, Indian Institute of Horticultural Sciences, Bengaluru- 560 089,
India
Corresponding author email: divyabapuji04@gmail.com;
Authors
International Journal of Horticulture, 2014, Vol.4, No.11 doi: 10.5376/ijh.2014.04.0011
Received: 14 Apr., 2014
Accepted: 25 Apr., 2014
Published: 13 May, 2014
Copyright
© 2014 Divya et al., This is an open access article published under the terms of the Creative Commons Attribution License, which permits
unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Preferred citation for this article
:
Divya et al., 2014, Physiological Basis of Rust Resistance in French Bean (
Phaseolus Vulgaris
), International Journal of Horticulture, 2014, Vol.4, No.11 53-57
(doi: 10.5376/ijh.2014.04.0011)
Abstract
Two resistant parents Arka Anoop and IC-525236 , three susceptible parents IIHRPB-1, IIHRPB-2 and IIHRPB-7 and six
crosses IIHRPB-1×Arka Anoop, IIHRPB-2×Arka Anoop, IIHRPB-7×Arka Anoop, IIHRPB-1×IC-525236, IIHRPB-2×IC-525236
and IIHRPB-7×IC-525236 were screened for rust resistance under artificial epiphytotic conditions at Indian Institute of Horticultural
Research, Bengaluru, during rabi, 2012. Studies were made on the resistant components
viz.,
Stomata count both on upper and lower
surface, Stomatal size (length and breadth), stomatal pore size. Among the genotypes screened against rust under natural and artificial
epiphytotic conditions, all the resistant parents and crosses did not show disease symptom and had less no. of stomata, small stomatal
and narrow stomatal pore than all three susceptible parents which showed disease severity. The results indicated that the
physiological basis of resistance, the structural features of stomata, like small stomatal pore size, narrow stoma and reduced number
of stomata are highly related to impart rust resistance in french bean cultivars.
Keywords
French bean; Rust resistance; Physiological basis of resistance
Introduction
French beans vary in their susceptibility to bean rust
(1). The earlier studies on the genetics of rust
resistance in beans have suggested that the most rust
resistance was monogenic (2). Variation in pathogenicity
was also found and as many as 150 races of the
pathogen have been reported. As the pathogen has
wide variability, it can adapt to new bean cultivar with
monogenic resistance (3). Hence, the attention is
shifted to partial resistance in overcoming the disease
epidemics. Partial resistance is a type of resistance,
which can be expressed at different phases during the
life cycle of pathogen. Hence, experiment was carried
out in bean rust pathosystem to find out the
physiological components of resistance to rust in
french bean like stomatal size and stomatal pore size.
Results
Stomata count (no.) on upper surface
Among the parents the maximum number of stomata
on upper surface found to be in IIHRPB-7 (17.11)
followed by IIHRPB-1 (15.33), however, the minimum
number of stomata on upper surface was found in
IC-525236 (11.50) followed by Arka Anoop (11.56).
Whereas in F
1
combination maximum number of
stomata on upper surface was found to be in
IIHRPB-2×IC-525236 (12.33) and IIHRPB-1×Arka
Anoop (12.33) followed by IIHRPB-7×IC-525236
(11.89) and minimum noticed in IIHRPB-7×Arka
Anoop (11.33) followed by IIHRPB-2×Arka Anoop
(11.56) (Table 1).
Stomatal count (no.) on lower surface
The number of stomata on lower surface among the
parents was found maximum in IIHRPB-2 (63.33)
followed by IIHRPB-1 (62.67), however, the minimum
number of stomata on lower surface was found in
Arka Anoop (38.56) followed by IC-525236
(41.00).Whereas in F
1
combination maximum number
of stomata on lower surface was found to be in
IIHRPB-7×IC-525236 (41.40) followed by and
IIHRPB-2×Arka Anoop (39.67) and minimum noticed
in IIHRPB-1×Arka Anoop (36.44) followed by
IIHRPB-7×Arka Anoop (36.56) (Table 1).
Stomatal Length (
m)
The maximum stomatal length was found in IIHRPB-2
(0.035) followed by IIHRPB-7 (0.033) among the
parents, however, the minimum stomatal length was in
Arka Anoop (0.021) followed by IC-525236 (0.022).
Whereas, in F
1
combination maximum length of
stomata was found to be in IIHRPB-2×IC-525236
(0.025) followed by and IIHRPB-1×Arka Anoop
(0.024) and minimum was noticed in IIHRPB-2×Arka