TY  - BOOK
AU  - Anu Mary C Philip 
AU  - Manju, P (Guide)
TI  - Genetic Evaluation of F4 and F5 Generations of Irradiated Interspecific Hybrids in Okra
U1  - 630.28 
PY  - 1998///
CY  - Vellayani
PB  - Department of Plant Breeding and Genetics, College of Agriculture 
N2  - A study was undertaken in the Department of Plant Breeding and 
Genetics, College of Agriculture, Vellayani during 1997-98 for the genetic 
evaluation of the F 4 and F 5 generations of irradiated interspecific hybrids 
between A. esculentus and A. manihot with the objective of isolating high 
yielding yellow vein mosaic disease resistant lines from the segregating 
generations. 
The families in the F 4M4 generation were found to be late flowering and 
recorded higher mean values for number of leaves, number of branches, 
number of flowers and number of fruits per plant compared to the cultivated 
parent. The fruit yield per plant was higher than the parents inspite of the 
reduction noticed in average fruit weight. The families recorded lesser values 
for fruiting phase and duration and higher values for plant height. The crude 
fibre content of the fruits, yellow vein mosaic incidence and shoot and fruit 
borer infestation were lower in the families. This provided scope for the 
selection of several high yielding and YVM disease resistant types from the 
F 4M4 generation 
Number of flowers per plant and incidence of YVM disease recorded 
high phenotypic and genotypic coefficients of variation. High heritability and 
genetic advance were observed for leaf number and weight of fruits per plant. 
Fruit yield per plant had high positive correlations with leaf number, number of 
branches, number of flowers and fruits per plant and plant height. Hence 
effective selection can be done for these characters for yield improvement. 
 
	
	
In the F sMs generation, the families were early flowering and recorded 
increase in leaf area, pollen sterility and number of branches per plant. The 
families also recorded higher mean values for leaf number, number of flowers 
and fruits per plant and plant height compared to the parents. The fruit yield 
per plant, average fruit weight and number of seeds per fruit were higher in the 
F sMs families. The fruiting phase and duration recorded an increase while the 
crude fibre content of fruits, incidence of YVM and incidence of shoot and 
fruit borer recorded lower mean values. 
Incidence of YVM disease had the maximum phenotypic and genotypic 
coefficients of variation. High heritability and genetic advance were observed 
for yield of fruits per plant. Weight of fruits per plant was significantly and 
positively correlated with leaf number, number of branches, number of flowers 
and fruits per plant, average fruit weight and plant height. Selection based on 
these characters will be effective in improving the yield of the crop. At the 
same time, high variation noted for YVM disease incidence offers more scope 
for selection based on disease incidence, in the process of selection for high 
yielding disease resistant types. 


UR  - https://krishikosh.egranth.ac.in/handle/1/5810101631
UR  - https://krishikosh.egranth.ac.in/displaybitstream?handle=1/5810101631&fileid=5a3ed789-7886-4c68-b39d-54c5e217585f
ER  -