PNABD246.pdf

P. atropurpureus, D. lablab, D. biflorus and Ficus religiosa. All the 24
mungbean varieties tested were susceptible. [ASJ
*0316 Jindal, J.K. ; Patel, P.N. 1980. Variability in xanthomonads of grain
legumes. 1. Pathogenic behaviour and taxonomy. JOURNAL OF PHYTOPATHOLOGY,
v.99:332-356. [EnJ [En De Abstj (A:PS)
Comparative host-range of ten xanthomonads isolated from nine pulse crops
[including mungbean and blackgramj was studied using five inoculation methods.
Typ; oi reaction and the presence or absence of bacterial ooze in the infected
tissuE were noted to indicate compatibility or noncompatibility. Degrees of
compatibility (susceptibility) could be noted on the basis of intensity of
bacterial ooze and severity in the symptoms. The results revealed that some of
these pathogens were cross-infective, and had overlapping host-range but all
were more aggressive on their natural host. These findings suggest close
evolutionary relationship among the pulse xanthomonads and form a distinct
group among the legume xanthomonads. Compatibility of pulse xanthomonads to
bean is considered a good criterion for taxonomic revision at subspecies level.
It is proposed that X. phaseoli var. fuscans and X. phaseoli from Dolichos
lablab be considered as strains of X. phaseoli, and X. cyamopsidis, X. phaseoli
var. sojense, X. vignicola, X. phaseoli from V. radiata (Syn. P. aureus), V.
mungo and V. aconitifolia be given a status of forma specialis in X. phaseoli.
X. phaseoli isolates from V. mungo and V. radiata, which do not cross infect,
were highly virulent on P. sublobatus. This suggests that evolution in these
xanthomonads towards the specialized pathogenic forms occurred simul'aneously
with the evolution of their hosts. Similarly, among the pulse xanthomonads only
the ones from V. mungo, V. radiata and V. unguiculata (Syn. V. sinensis)
produced susceptible reaction on attached V. unguiculata pods, suggesting close
evolutionary relationships among these hosts and these pathogens, and give
indirect support to the recent transfer of P. aureus and P. mungo to the genus
Vigna. LAS]
*0317 Jindal, J.K. ; Patel, P.N. ; Khan, A.M. 1981. Variability in
zanthomonads of grain legumes. 2. Pathogenic variability in Xanthononas
phaseoli aungbean strain, X. vignicola and X. phaseoli var. sojense. JOURNAL
OF PHYTOPATHOLOGY, v.100(1):1-9. [En] [En De Abst] (A:PS)
Pathogenic variability in three pulse xanthomonads has been inveptigated.
Out of the 45 mungbean genotypes tested using rub-inoculation method, 32
reacted as resistant, 6 as susceptible and the remaining 7, viz., P-23, P-28,
P-125, P-161, P-10875, PLM-95 and PLM-141 showed differential reactions to the
11 isolates of the leaf spot pathogen (X. phaseoli mungbean strain). On the
basis of these studies six distinct races were identified. Cowpea blight
pathogen (X. vignicola) showed differences in virulence and attackability
(Pathogenic races) when 12 resistant and 23 susceptible cowpea genotypei; were
inoculated with 11 isolates using stem-stab method. Of the resistant Ites,
nine rpaced as resistant to all the isolates and three, P-370, P-1325 r'd
P-1418 differentiated these isolates into five races. On susceptible vazteties
isolate XC-3 proved to be the most virulent, whereas XC-9 was least viru,ent.
Soybean pustule organism (X. phaseoli var. sojense) showed no pathogenic
variability when 15 resistant and 5 susceptible g¢enotypes were spray-inoculated
with eight isolates. [AS]
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