Abstract:
The investigation was carried out with 24 F
3
white maize populations to study
the genetic variability, character association and finally to select the short
duration and dwarf promising populations based on yield and yield contributing
traits at Sher-e-Bangla Agricultural University, Dhaka during November 2017
to March 2018. Significant variations were observed among the F
3
populations
for all the traits studied. The F
3
population of KS-510-F
3
-S
2
showed the
maximum mean performance in plant height (220.61 cm), cob length (19.65
cm), number of grains per row (33.83), while the population of Youngnuo-7F
3
-S
1
showed the minimum mean performance in plant height (122.33 cm), cob
height (53.00 cm), base diameter (6.10 cm). The population PSC-121-F
3-
showed the maximum yield per plant (97.67), while Youngnuo-7-F
3
showed
the minimum yield per plant (46.94). In analysis of different genetic parameters
the highest genotypic coefficient of variation (GCV) and phenotypic coefficient
of variation (PCV) values were observed for cob height (20.99, 21.55), leaf
blade area (19.20, 20.31), yield per plant (19.04, 22.59). High heritability
coupled with high genetic advances in percent mean were obtained for plant
height, cob height, number of cob bearing node, leaf blade area, number of
grains per row and yield per plant. Correlation studies revealed that yield per
plant positively and significantly associated with plant height, base diameter,
number of leaves per plant, cob length, cob diameter and number of grains per
row at both genotypic and phenotypic levels. Path coefficient analysis indicated
positive direct contribution towards yield per plant through plant height, base
diameter, branches of tassel, leaf blade area, cob length, cob diameter, number
of rows per cob, number of grains per row and 100 grain weight. Based upon
the mean performance among the 24 F
3
-S
1
segregating population, PSC-121-F
3
and KS-510-F
3
-S
1
would be selected for high grain yield per plant. Again
Youngnuo-7-F
3
-S
2
and Changnuo-1-F
3
-S
1
might be selected as promising for
both of the traits short duration and dwarf plant stature.
S
2
-S
2
Description:
A Thesis
submitted to the Faculty of Agriculture,
Sher-e-Bangla Agricultural University, Dhaka,
in partial fulfillment of the requirements for the degree of
MASTER OF SCIENCE
IN
GENETICS AND PLANT BREEDING
SEMESTER: JANUARY-JUNE, 2018
