Abstract:
The prescifi research vork s as ai med at to study the genetic divergence and
relationship between yield and yield conLriblttilg characters in 40 genotypes of
spring heat. The characters viz. plant heighL spikes/plant. spike length.
grains/spike. 1000 grain weight. harvest index, vegetative period, grain filling
period. days to nlaturit>:. and grainyield/ plant were investigated and significant
variations were observed among the genotpes. Divergence analysis ci ustered the
stud ed genotypes into 7 di verse eroups, he inaxinium number of genot) pes
were clubbed in cluster I Followed by Cluster II. IV. V and A. The cluster Ill
and \'ll contained IlliilifllUifl numbers 01 genotypes. Coniparisoii 01 cluster means
br all the characters indicated considerable eenetie di veruellee between the
groups. The highest intra-cluster distance was obtained For cluster VII followed
by ('luster VI and cluster III. The naxinun inter-cluster disiance was observed
heteen genotypes of cluster V and VI Followed In cluster VI and VII. and
cluster II and V. The scattered diagram revealed that the genotypes 02. 016.
019. 022. 028. 036 and 037 took positions at the periphery of the diagranl
.stmgs!esting that these varieties/lines were more diverged from rest of the
Ltenot\ pes. Considering yield and contributing characters it appears that the
genotypes (119 (6.54) and (337 (6.65) ere promising for high yield potentiality.
iherebore. these two genotypes could he selected for yield improveilteilt
program in spring wheat. Study of correlations showed that grain yieldplant
was significantly and posidvely correlated with grains per spike at both
phenotypic and genotvpic levels and with spikes/plant at phenotypic level.
Among the studied characters, spikes/plant showed tIle highest phenotypic
coefficient of \arialiomi bollowed by grain yield per plant. harvest index and
1000-uraiit weight. Study of heritability indicated that the characters
spikes/plant. 1000-grain weight. harvest index and grain yield/plant were highly
heritable. Path coefficient analysis also conhtrnled tllat spikes/plant. grains/spike.
spike IcilztIl. 1000-grain weight, and harvest index influenced grain yield
directly in positive direction. So. these characters shotild be taken int)
consideration in selection for yield improvement
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, 2014
