Variability, heritability and genetic advance in mulberry (<i>Morus</i> spp.) for growth and yield attributes

Abstract

Genetic improvement of crop plants is brought about by manipulating the genetic makeup through systematic breeding techniques or by employing modern biotechnological tools. Application of systematic breeding technique to a large extent is decided by the knowledge on the genetic control of the traits. Keeping this in view, nine mulberry genotypes were evaluated for different growth and yield attributing traits viz., number of tillers (NT), plant height (PH), total shoot length (TSL), nodal distance (ND), leaf fall % (LF), number of leaves/plant (NLP), weight of 100 fresh leaves (WFL), weight of 100 dry leaves (WDL), single leaf area (LA), leaf area index (LAI), aboveground biomass (AGB), leaf harvest index (LHI) and leaf yield (LY) and estimated the magnitude of genotypic and phenotypic variation, heritability, genetic advance and correlation coefficients. The broad sense heritability for these traits ranged from 63.942 (WFL) to 13.261 (PH). High heritability coupled with high genetic advance was recorded for the characters WFL, LF, LA, WDL and LY suggesting the higher genetic control over these traits. Leaf yield showed significantly positive phenotypic and genotypic correlations with all other growth traits except PH and LF. Leaf fall had significant negative correlations with all the highly heritable yield attributes viz., ND (-0.379), WDL (-0.225), LA (-0.346), LAI (-0.233) at 1% level and AGB (-0.148), LHI (-0.122) and LY (-0.146) at 5% level. Likewise, it showed positive correlations with TSL (0.558), NLP (0.264) and PH (0.221). Since mulberry is mainly cultivated for leaf yield, genotypes having higher WFL, LA, WDL and LY and less LF must be given importance during parent selection to evolve high yielding varieties with less leaf fall across different seasons in mulberry

Genetic variability and correlation studies of mulberry (Morus alba L.) genotypes in Bangladesh

“…Moderate genetic advance as percentage of mean coupled with high heritability noticed for the characters total branch number per plant, nodes per meter, internodal distance and leaf yield per plant indicated the presence of intra and inter allelic interactions in the expression of these characters. These result agreed well with the observation made by Goel et al (1998), Tikader et al (2004, Banerjee et al (2007), Mallikarjunappa et al (2008), Tikader and Kamble (2008), Doss et al (2012), Biradar et al (2015) and Suresh et al (2017). Previously similar findings of high h 2 and GA% were reported for the characters viz., leaf yield, weight of 10 fresh leaves and SLA among 9 different species of mulberry (Doss et al 2006).…”

“…The plants are cultivated under both tropical and temperate climatic conditions of different regions in Bangladesh. As leaf productivity is one of the principal factors that decide the sustainability and profitability of sericulture, good quality mulberry leaf increases the cocoon productivity and quality of silk (Ashiru 2002, Doss et al 2012. It is grown as small bushes and 60% of cost involved in total production of silkworm cocoon production goes to mulberry cultivation only (Das and Swami 1965).…”

Genetic diversity analysis based on morphological characters in mulberry (Morus spp.)

“…The plants are cultivated under both tropical and temperate climatic conditions of different regions in Bangladesh. As leaf productivity is one of the principal factors that decide the sustainability and profitability of sericulture, good quality mulberry leaf increases the cocoon productivity and quality of silk (Ashiru 2002, Doss et al 2012. To develop high yielding with superior cultivars is a major challenge and goals for the breeders.…”

Caractérisation de la diversité phénotypique et génotypique du Sorgho pluvial dans la zone soudano sahélienne du Cameroun

“…Les paramètres génétiques estimés ont montré que la variance génotypique est inférieure à la variance phénotypique de tous les caractères étudiés. Ces résultats concordent avec ceux de (Nerbéwendé et al, 2014) sur le sorgho à tiges sucrées, (Drabo et al, 2013) sur le mil, (Hosseini et al, 2012) sur le riz et (Doss et al, 2012) sur le mûrier. Les écarts entre ces deux variances (Variances génotypique et phénotypique) sont assez faibles.…”