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Pathology
sucrose l e v e l s were n o t s i g n i f i c a n t l y
d i f f e r e n t . I n c r e a s e d l e v e l s o f r e d u c i n g
sugars and n o n f e r m e n t a b l e r e d u c i n g s u b s t a n ­
ces were observed in d i s e a s e d l e a v e s over
h e a l t h y l e a v e s .
NAMBIAR, K . K . N . , and K. RAMAKRISHNAN.
1969.
S t u d i e s o n plgeonpea s t e r i l i t y mosaic
d i s e a s e . V I I . E f f e c t o n m i n e r a l m e t a b o l i s m .
P r o c . I n d i a n Acad. S c i . ( S e c t . B ) 70:
3 7 - 4 1 . 1007
Ca, K, Na, and Mn c o n t e n t s were lower in
diseased than in h e a l t h y p l a n t s , Ca decreas
i n g w i t h t h e age o f t h e l e a v e s .
NAMBIAR, K . K . N . , and K. RAMAKRISHNAN.
1969.
S t u d i e s o n plgeonpea s t e r i l i t y mosaic
v i r u s . V I I I . E f f e c t o n p h o t o s y n t h e s i s and
n u c l e i c a c i d s o f plgeonpea l e a v e s .
P h y t o p a t h . 6 6 : 9 1 - 9 4 . 1008
A s i g n i f i c a n t r e d u c t i o n i n p h o t o s y n t h e s i s
and r a t e o f H i l l r e a c t i o n was recorded i n
diseased l e a v e s , p h o t o s y n t h e s i s b e i n g l e a s t
in t h e y e l l o w p a t c h e s . RNA and DNA l e v e l s
were h i g h e r i n d i s e a s e d leaves o f a l l ages.
RNA f r a c t i o n s presumably c o n t a i n e d v i r a l
as w e l l as p l a n t RNA.
NAMBIAR, K . K . N . , and K. RAMAKRISHNAN.
1969.
S t u d i e s o n plgeonpea s t e r i l i t y m o s a i c .
I X . E f f e c t o n n i t r o g e n m e t a b o l i s m .
P r o c . I n d i a n Acad. S c i . ( S e c t . B ) 7 0 :
200-207. 1009
T o t a l N was h i g h e r i n diseased t h a n i n
h e a l t h y leaves a t a l l ages. A l l forms o f
N, except ammoniacal and n o n p r o t e i n , were
i n c r e a s e d . Free amino a c i d s , v i z . , v a l i n e ,
l e u c i n e , and a r g i n i n e were a t h i g h e r c o n ­
c e n t r a t i o n s i n younger than i n o l d e r
diseased l e a v e s . The h i g h c o n c e n t r a t i o n s
o f amino a c i d s i n t h e bound form i n d i s ­
eased l e a v e s suggests t h e i r p r o b a b l e
i n c o r p o r a t i o n i n t o t h e v i r u s p r o t e i n .
NARAYANASWAMY, P. 1964.
S t u d i e s o n t h e s t e r i l i t y mosaic d i s e a s e o f
r e d gram. Ph.D. (1964) T h e s i s . U n i v e r s i t y
of Madras, Madras, Tamil Nadu,
I n d i a . 1010
NARAYANASWAMY, P . , and T. JAGANATHAN.
1975.
A n o t e on powdery mildew d i s e a s e of p i g e o n -
pea (Cajanus c a j a n ( L . ) M i l l s p . ) .
S c i . C u l t . 4 1 ( 3 ) : 1 3 3 - 1 3 4 . 1011
The disease was g e n e r a l l y seen on young
l e a v e s . Stems and p e t i o l e s a l s o showed
symptoms. I n severe c a s e s , the a f f e c t e d
leaves t u r n e d y e l l o w , e x h i b i t i n g c r i n k l i n g .
This s p e c i e s , Oidiopsis taurica, d i d n o t
produce t h e p e r f e c t s t a g e . Plgeonpea was
r e p o r t e d as a new h o s t f o r t h i s f u n g u s .
NARAYANASWAMY, P . , and K. RAMAKRISHNAN.
1965.
S t u d i e s o n t h e s t e r i l i t y mosaic d i s e a s e o f
plgeonpea. I . T r a n s m i s s i o n o f the d i s e a s e .
P r o c . I n d i a n Acad. S c i . ( S e c t . B ) 6 2 :
7 3 - 8 6 . 1012
The plgeonpea s t e r i l i t y mosaic was n o t
t r a n s m i t t e d by sap or i n s e c t s . There were
i n d i c a t i o n s to show t h a t t h e d i s e a s e was
p r o b a b l y s o i l - b o r n e . Decrease i n nematode
p o p u l a t i o n reduced d i s e a s e i n c i d e n c e , t h e
r e d u c t i o n being greater i n D D - t r e a t e d p l o t s
than i n Nemagon-treated p l o t s . I t i s
surmised t h a t the disease i s p r o b a b l y
t r a n s m i t t e d by Rotylenahulus r e n i f o r m i s
a n d / o r Tylenahorhynahus spp. A n e g a t i v e
c o r r e l a t i o n was o b t a i n e d between the
p o p u l a t i o n o f p l a n t s and percentages o f
i n f e c t i o n .
NARAYANASWAMY, P . , and K. RAMAKRISHNAN.
1965.
S t u d i e s o n s t e r i l i t y mosaic d i s e a s e o f
plgeonpea. I I . Carbohydrate metabolism o f
i n f e c t e d p l a n t s . P r o c . I n d i a n Acad. S c i .
( S e c t . B) 6 2 : 1 3 0 - 1 3 9 . 1013
The r e d u c t i o n i n t h e c h l o r o p h y l l c o n t e n t
v i r u s - d i s e a s e d plgeonpea leaves was as h i g h
as 60.9%. Carotene and x a n t h o p h y l l conterts
of diseased leaves a l s o showed a decrease
as d i d the t o t a l c a r b o h y d r a t e c o n t e n t . The
a c t i v i t y o f c h l o r o p h y l l a s e was i n c r e a s e d
due to v i r u s i n f e c t i o n . The s y n t h e s i s of
sucrose in diseased leaves was at a lower
r a t e than i n h e a l t h y ones and r e s u l t e d i n
derangement o f p h o t o s y n t h e t i c a c t i v i t y i n
diseased p l a n t s . The t r a n s l o c a t i o n o f
sugars was reduced and t h e n a t u r e of sugars
t r a n s l o c a t e d was a l t e r e d i n t h e diseased
p l a n t s .
NARAYANASWAMY, P . , and K. RAMAKRISHNAN.
1966.
S t u d i e s o n t h e s t e r i l i t y mosaic d i s e a s e o f
plgeonpea. I I I . N i t r o g e n metabolism o f
i n f e c t e d p l a n t s . P r o c . I n d i a n Acad. S c i .
( S e c t . B) 6 3 : 2 8 8 - 2 9 6 . 1014
A decrease i n t h e c h l o r o p l a s t l c p r o t e i n and
a s l i g h t i n c r e a s e i n t h e c y t o p l a s m i c p r o ­
t e i n was seen i n t h e diseased l e a v e s . There
was n o a p p r e c i a b l e q u a n t i t a t i v e d i f f e r e n c e
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