Response of callus culture and seedlings of a salt tolerant
rice variety, pokkali, was compared to that of a salt
sensitive variety, hrswa, under conditions of salinity stress
induced by incorporating different quantities of sea water
in the culture media. Seedlings of pokkali showed minimal
symptoms of salt stress under conditions of low salinity and
more severe symptoms including dry of older leaves under
high salinity Conditions. However, seedlings of hrswa
showed severe stress symptoms even under low salinity and
plant death under high salinity conditions. This superior
character of salt tolerance of pokkali over hrswa was,
however, not observed in callus cultures. In both the
cultivars, the severity of symptoms depended on the
intensity of stress. Accumulation of free proline in callus
cultures and seedlings under stress conditions was
monitored. Both pokkali and hrswa accumulated proline
in response to stress to the same level. The response was
same in callus cultures and in seedlings of both cultivars and
the rate of proline accumulation was dependent on the
intensity of stress. This, study, thus, indicates that
accumulation of proline is not indicative of salt tolerance
character in rice.
Shreedevi,T T; Padayatti,P S; Kala,M S; Philip,J; Paulose,C S(Department of Biotechnology, May 25, 1994)
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Abstract:
Optical absorption characteristics of rat blood
affected by diabetes has been studied using photoacoustic
(PA) technique. PA spectrum of blood
depends on the molecular structure of haemoglobin.
The peak value ratio ylQ increases with increase in
the diabetic state. Externally added glucose to
normal blood does not show any increase in y//3 ratio
as seen in the diabetic condition . The increase in yl,8
ratio may be due to the decrease in DPG level and
the resultant shift from R -> T conformation of
majority of diabetic haemoglobin.