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| Articles
by
Khaleda Akter |
Total Records (
3 ) for
Khaleda Akter |
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K. M. Iftekharuddaula
,
Khaleda Akter
,
M. S. Hassan
,
Kaniz Fatema
and
Adil Badshah
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Genetic divergence, correlation and path coefficient analysis among 19 genotypes of
irrigated rice were studied for grain yield and yield contributing characters. The genotypes
under study fell into five clusters. The inter cluster distances were higher than the intra
cluster distances indicating wider genetic diversity among the genotypes of different
clusters. The intra cluster distances were lower in all the cases reflecting homogeneity of
the genotypes within each of the clusters. Regarding inter cluster distance, cluster II
showed high genetic distance from all other four clusters. The genotypes from cluster II
could be hybridized with the genotypes of any other clusters for producing transgressive
segregants. Clustering pattern was not influenced by the geographic origin rather it was
influenced by the pedigree of the breeding lines. Harvest index, panicle length and 1000
grain weight showed significant positive correlation with grain yield. Highest direct effect
on grain yield was exhibited by spikelets/panicle followed by plant height, harvest index,
1000 grain weight and panicle length respectively. Grains/panicle, spikelets/panicle, flag
leaf area, 1000 grain weight and plant height had highest contribution towards divergence
respectively. Considering the relative contribution of different characters towards diversity
and the effect of correlation and path coefficient all together; the characters like plant
height, spiklets/panicle, grains/panicle, 1000 grain weight, flag leaf area and grain yield
were found important. Genotypes having these characters of respective cluster would offer
a good scope for the improvement of irrigated rice through rational selection. |
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Khaleda Akter
,
M.K. Bashar
,
K.M. Iftekharuddaula
,
M.S. Ahmed
and
E.S.M.H. Rashid
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Forty five rice genotypes originating from Bangladesh, IRRI (Philippines), Japan and China were evaluated under irrigated ecosystem with a view to finding out genetic divergence for 10 characters including yield. The genotypes were constellated into five distinct groups with the range of three genotypes in cluster V and 16 genotypes in cluster III. The inter-cluster distances were larger than the intra-cluster distances in all cases except in cluster III, suggesting wider genetic diversity among the genotypes of different groups. The intra- cluster distance was highest in cluster III and least in cluster V. Maximum inter- cluster distance was observed between genotypes of cluster I and II followed by cluster I and III; II and IV; III and IV and the minimum was found between genotypes of cluster II and III. Plant height, grains/panicle and yield/hill were mainly responsible for genetic divergence while considering mean values. Though grains/panicle, days to flowering and grain length were positive contributors to genetic diversity based on the latent vectors. Clusters with small intra-cluster distances were considered less diverse than those with large distances. The mean yield, grains/panicle, plant height and days to flowering was lowest in cluster I and therefore, crosses involving the genotypes from this cluster with those from cluster II and III may exhibit high heterosis for earliness and grains/panicle. Crosses could also be made between clusters IV with that of II and III for evolving high yielding and early maturing varieties. Closer affinity of Bangladeshi traditional varieties was observed though some of them were in different clusters. Most of the breeding lines were included in cluster III indicating homogeneity in their pedigree. |
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M.K. Bashar
,
Khaleda Akter
,
K.M. Iftekharuddaula
and
M.S. Ali
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Leaf water potential (y leaf)
was measured in culture solution in hydroponic system under controlled
condition of the two crosses involving diverse rice genotypes to investigate
the inheritance pattern and heritability. Polygenes were involved in this
trait and theψleaf was governed
either by no-dominant or partial dominant alleles and that was controlled by
genes with additive effects in upland and hill rice. The heritability
estimates were low (25-28%). Leaf water potential was significantly and
positively correlated with root thickness, root volume, root length, plant
height and leaf area in one of the two crosses. Negative relationship was
found with shoot dry weight. |
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