TY  - BOOK
AU  - Biju S 
AU  - Radakrishnan V V (Guide)
TI  - Alternative sources of cytoplasmic male sterility and genetic analysis of fertility restoration in Rice (oryza Sativa L.)
U1  - 630.28 
PY  - 2001///
CY  - Vellanikkara
PB  - Department of Pnimal Breeding and Genetics, College of Horticulture
N2  - Investigation for alternative source of cytoplasmic male sterility suitable 
for warm humid tropical climatic conditions was conducted at Agricultural 
Research Station, Mannuthy and College of Horticulture, Vellanikkara (1998•• 
2001). The study included the evolution of alternative source of cytoplasmic male 
sterility, potential CMS lines, screening of genotypes for fertility restoration and its 
genetic analysis. From the backcross experiments conducted, sterile cytoplasmic 
source was confirmed to be that of Bhadra and saline tolerant rice variety Vytila-3. 
The cytoplasmic nuclear interaction exhibited by various crosses studied, resulted 
in the manifestation of male sterility. The four cross combinations with Vytila-3 
and Bhadra as cytoplasmic maternal sources exhibited increase in male sterility 
with each step of backcross. In the case of Vytila-3 x IR 36, 100 percentage male 
sterility was obtained in the F2BC3 generation. This points out the relevance of 
backcrossing to evolve fully male sterile line in other crosses also. With respect to 
grain yield and components, the highest positive gca effect was observed in Bhadra 
followed by Mattatriveni. Since the dominance variance of this character was 
greater than the additive genetic variance, there is scope for hybrid vigour 
exploitation. The estimation of heterosis in the case of hybrids produced was 
significant enough to explore the prospects of hybrid rice suited to warm humid 
tropics. Generation mean analysis revealed that the characters tillers at harvest, 
panicle length, spikelets per panicle, grain LIB ratio and pollen sterility percentage 
were controlled by both allelic contribution and its interactive effects and hence for 
improving the characters, hybridization followed by selection can be resorted to. 


UR  - http://krishikosh.egranth.ac.in/handle/1/5810015124
ER  -