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M i c r o b i o l o g y
NORMS, D.O. 1970.
The c o n t r i b u t i o n of research in legume
b a c t e r i o l o g y t o the development o f A u s t r a ­
l i a n p a s t u r e s . P r o c . X I I n t e r n a t . Grassl
a n d Cong. 13-23 A p r i l 1970. Queensland,
A u s t r a l i a . 2 2 - 3 0 . 832
Research in legume b a c t e r i o l o g y has played
a v i t a l r o l e i n A u s t r a l i a n p a s t u r e d e v e l o p ­
ment, which i s h e a v i l y dependent o n
i n t r o d u c e d legume s p e c i e s , both temperate
and t r o p i c a l . I n v e s t i g a t i o n s o f the
s y m b i o t i c a f f i n i t i e s of Trifolium and
Medicago spp. and a v a r i e t y of t r o p i c a l
legumes has l e d t o t h e s e l e c t i o n o f h i g h l y
e f f e c t i v e R h i z o b i u m s t r a i n s f o r use a s
i n o c u l a n t s and s e r o l o g i c a l techniques f o r
s t u d y i n g t h e i r f i e l d performance have been
developed and r e f i n e d . The s e t t i n g up of
the c o o p e r a t i v e o r g a n i z a t i o n U-DALS has
r e s u l t e d i n h i g h q u a l i t y commercial i n o c u ­
l a n t s . The development of seed p e l l e t i n g
procedures has g r e a t l y improved ease and
e f f i c i e n c y o f f i e l d e s t a b l i s h m e n t i n many
c i r c u m s t a n c e s .
OKE, O.L. 1967.
N i t r o g e n f i x i n g c a p a c i t y o f some N i g e r i a n
legumes. Expl A g r i c . 3 ( 4 ) : 3 1 5 - 3 2 1 . 833
The f i x a t i o n of N in r o o t nodules of
Cajanus aajan, Centrosema pubescens, and
S t y l o s a n t h e s gracilis grown in pots in
sand s u p p l i e d w i t h a N-free n u t r i e n t
s o l u t i o n was s t u d i e d i n N i g e r i a . N - f i x a -
t i o n i n these legumes a t t a i n e d maxima o f
1 4 . 5 , 1 0 . 3 , arid 4 . 6 mg per day per p l a n t ,
r e s p e c t i v e l y . Some 90% or more of the N
f i x e d was t r a n s f e r r e d from the nodules to
t h e r e s t o f t h e p l a n t soon a f t e r f i x a t i o n .
F i x a t i o n per g of nodules was h i g h e s t f o r
C. aajan d u r i n g the e a r l y development
phase.
PALACIOS, G . , and A. BARI. 1936.
A new microorganism a s s o c i a t e d w i t h the
nodule b a c t e r i a in Cajanus indicus. P r o c .
I n d i a n Acad. S c i . ( S e c t . B ) 3 ( 4 ) :
362-365. 834
A new organism ( B a c i l l u s concomitans nov.
s p . ) i s d e s c r i b e d which i s found f r e q u e n t l y
i n s i d e t h e nodules formed in Cajanus
i n d i a u s . When i s o l a t e d i n pure c u l t u r e
i t does n o t produce n o d u l e s . I t g i v e s a
congo-red n e g a t i v e r e a c t i o n and possesses
many o t h e r c h a r a c t e r i s t i c s which d i f f e r e n -
t i a t e it from Rhizobium radiaicola and
B. radiobacter.
RAJU, M.S. 1939.
Studies o n t h e b a c t e r i a l - p l a n t g r o u p s . V I .
V a r i a t i o n i n t h e e f f e c t i v e n e s s o f d i f f e r e n t
s t r a i n s of nodule b a c t e r i a of cowpea groups
( I I . I n f l u e n c e o f l i g h t o n the e f f e c t i v e ­
n e s s ) , Cajanus aajan and Dolichos biflorus.
Z b l . B a k t . 1 1 ( 9 9 ) : 4 4 9 - 4 6 0 . 835
RAMASWAMY, P . P . , and K.S. NAIR. 1965.
Symbiotic v a r i a t i o n o f Rhizobium from
nodules of redgram (Cajanus c a j a n ) . Madras
A g r i c . J . 52:239-240. 836
Among the Rhizobiwn i s o l a t e d from the
nodules of d i f f e r e n t hosts of the same
s p e c i e s , t h e r e i s wide v a r i a t i o n i n t h e
c a p a c i t y t o f i x atmospheric n i t r o g e n i n
the host legume. The n e c e s s i t y f o r s e l e c t ­
i n g s u i t a b l e s t r a i n s of Rhizobium to
b r i n g about maximum b e n e f i t to the legume
crop i s i n d i c a t e d .
SAXENA, M.C., K.V.B.R. TILAK, and
D.S. YADAV. 1975.
Response of pigeonpea to i n o c u l a t i o n and
p e l l e t i n g . I n d i a n J . Agron. 2 0 ( 4 ) :
321-324. 837
I n o c u l a t i o n i n c r e a s e d g r a i n y i e l d over t h a t
o f n o n - i n o c u l a t e d c o n t r o l . D u r i n g 1972,
g r a i n y i e l d was maximum in case of seed
p e l l e t i n g w i t h l i m e and i n o c u l a t e d w i t h
IARI c u l t u r e . Various t r e a t m e n t s d i d n o t
d i f f e r s i g n i f i c a n t l y i n g r a i n y i e l d d u r i n g
1973. Maximum n o d u l a t i o n o c c u r r e d d u r i n g
b o t h the years in case of seed p e l l e t e d
w i t h l i m e and i n o c u l a t e d w i t h Pantnagar
c u l t u r e . Maximum r h i z o b i a l number i n
r h i z o s p h e r e was a s s o c i a t e d w i t h l i m e -
p e l l e t e d seeds.
SETHUNATHAN, N. 1970. .
F o l i a r sprays of growth r e g u l a t o r s and
r h i z o s p h e r e e f f e c t in Cajanus aajan M i l l s p .
1 . Q u a n t i t a t i v e changes. P I . S o i l
3 3 ( l ) : 6 2 - 7 0 . 838
The response of r h i z o s p h e r e m i c r o f l o r a of
pigeonpea t o v a r i o u s growth r e g u l a t o r s
was s t u d i e d . The number of f u n g i s i g n i f i ­
c a n t l y i n c r e a s e d i n the r h i z o s p h e r e o f
s e e d l i n g s sprayed w i t h 25 ppm naphthalene
a c e t i c a c i d . S i g n i f i c a n t i n c r e a s e s i n
b a c t e r i a l numbers o c c u r r e d i n t h e r h i z o ­
sphere o f p l a n t s t r e a t e d w i t h 2 , 4-D (25
ppm). G i b b e r e l l i n (100 ppm) or 0.2X
m a l e i c h y d r a z i d e g e n e r a l l y depressed t h e
a c c u m u l a t i o n of m i c r o o r g a n i s m s . However,
no a d d i t i v e 111 e f f e c t s o c c u r r e d when they
were a p p l i e d i n c o m b i n a t i o n . The e f f e c t s
o f i n d o l e a c e t i c a c i d were i n c o n s i s t e n t .
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