Phenotypic Characterization of Jhum Rice (Oryza sativa L.) Landraces Collected from Rangamati District in Bangladesh

Abstract

Genetic diversity of 30 Jhum rice landraces was studied under irrigated condition through Mahalanobis D2 statistic for agro-morphological characters. The landraces were grouped into five clusters. The intercluster distances were higher than intra-cluster distances indicating wider genetic diversity among the landraces of different clusters. The intra-cluster distances were lower in all the cases reflecting homogeneity of the genotypes within the clusters. The principal component analysis exposed that the first five components with vector values > 1 contributed 81.14% of the total variations. The highest number (8) of landraces was observed in cluster IV and the lowest (4) in cluster II. The intra-cluster distance was maximum in cluster III (1.62) containing six landraces and minimum in cluster I (0.57) having six landraces. The highest inter cluster value was 23.44 (between cluster II and V) and the lowest was 7.29 (between cluster III and IV). The highest flag leaf length, leaf area index, filled grains per panicle were found in cluster V while the lowest culm diameter, short duration, low yielding genotypes were clubbed into cluster II. Dwarf stature and lower flag leaf length were recorded into cluster I whereas the highest plant height and panicle length were obtained from cluster IV. Based on canonical vector analysis, culm diameter, days to flowering, days to maturity and length-breadth ratio had maximum contribution towards genetic divergence. Selection of parents from the clusters II and V followed by hybridization would possibly result in desirable transgressive segregants. Finally, Jhum rice landraces need to be conserved in Genebank for future breeding programmeBangladesh Rice j. 2017, 21(1): 47-57

Agro-morphological Characterization and Genetic Diversity of Similar Named Aromatic Rice (Oryza sativa L.) Landraces of Bangladesh

“…The present study exhibited high variability in most of the observed qualitative traits of aromatic rice landraces. Similar types of work was also reported by other authors (Bisne and Sarawgi, 2008;Moukoumbi et al, 2011;Mau et al, 2017 andIslam et al, 2017). The unique and similar type aromatic landraces were found for different qualitative agro-morphological characters (Table 3) which could be used in hybridization programme regarding issues like distinctness of new variety and intellectual property rights.…”

Variability, Heritability and Diversity Analysis for Some Morphological Traits in Basmati Rice (Oryza sativa L.) Genotypes

“…Islam et al, (2014), Akter et al, (2016) and Ahmed et al (2010) reported six clusters each. Besides that, Islam et al (2017) and Siddique et al (2013) reported five clusters each in their experiment with rice genotypes. The distribution pattern revealed maximum number of genotypes in cluster IV (eight genotypes) followed by six genotypes in cluster I and four in cluster II, III and V.…”

Genetic Variability, Character Association and Path Analysis in Boro Rice (Oryza sativa L.) Germplasm from Bangladesh

“…Moreover, knowledge of correlation between yield and its contributing agro-morphological traits are basic requirement to find out guidelines for plant selection. In rice, large amount of genetic variability has been reported (Khatun et al, 2015;Ahmed et al, 2015;Islam et al, 2017;Akter et al, 2018;Islam et al, 2018) which indicates the potential for genetic improvement. Partitioning of total correlation into direct and indirect effect by path analysis helps in making the selection more meaningful way.…”