| dc.description.abstract | An investigation was carried out with 25 wheat genotypes composed of land races and
cultivars to screening bread wheat genotypes using multivariate analysis. The experiment
was conducted at Hajee Mohammad Danesh Science and Technology University,
Dinajpur, Bangladesh during rabi season of 2016-17 in Split Plot Design with three
replications. The experiment was conducted in a plustic tunnel using control and drought
block. The results of analysis of variance revealed significant differences among the
genotypes and treatments for all the characters studied viz. plant height, flag leaf collar
height, flag leaf length, flag leaf breadth, chlorophyll a, chlorophyll b, proline content,
number of tillers per plant, root fresh weight, shoot fresh weight and root shoot ratio. The
genotype x treatment interaction was significant for most of the characters except
number of tillers per plant. Comparing the mean values, control blocks appeared superior
performances than drought blocks in most of the traits except proline content. High
heritability was observed for all the traits except flag leaf length, flag leaf breadth and
number of tillers per plant. High heritable characters can be further used for selection of
superior genotypes. Based on the genetic distance, all the 25 genotypes were grouped
under three different clusters. In control conditions, cluster number I holding most
tolerant genotypes (BARI21, BARI22, BARI23, BARI24, BARI25, BARI26, BARI27,
BARI28, BARI29, BARI30, SATYN2, SATYN4, SATYN11, SATYN12, SATYN18
and SATYN24) with the highest number of relative mean for plant height, flag leaf
collar height, chlorophyll b, proline content and shoot fresh weight. Among the three
clusters for drought condition, cluster number III holding most tolerant genotypes
(BARI27, SATYN19, SATYN24) with the highest number of relative mean value for
chlorophyll a, chlorophyll b, number of tillers per plant, shoot fresh weight, root fresh
weight. The results of the principal component analysis showed that the first 6 principal
component axes explained 97.22% in controls condition and 97.25% in drought
condition of the total variations in the wheat populations. Considering overall PCA, the
highest genetic diversity was contributed by PC1 and PC2 in both control and drought
conditions for plant height, flag leaf collar height, root fresh weight, shoot fresh weight
and root shoot ratio. Therefore, these characters should be given emphasis for further
selections in wheat breeding. The results of drought susceptibility index (DSI) indicated
the superiority in the genotype BARI24 closely followed by the genotypes SATYN12,
BARI27, BARI23, BARI25, SATYN17, SATYN4, SATYN2, SATYN24, BARI21,
BARI30 and SATYN26. The drought susceptibility index (DSI) indicated that the
genotype BARI24 and SATYN9 exhibited highly drought tolerant genotype in the
present piece of investigation. These genotypes might carry genes for drought tolerant
and might posses novel plant material for further drought tolerant breeding. | en_US |
