Aims: To assess genetic variability for vegetative and reproductive traits in different seasons. Study Design: Field experimental design was used. Place and Duration of Study: The experiment was conducted in different seasons during 2019-20 at Department of Sericulture, University of Agricultural Sciences, GKVK, Bangalore. Methodology: The present study comprised of Seventy one mulberry accessions. Results: The mean performance of leaf moisture content (64.41 & 55.42%) and leaf yield (1268.71 & 872.21g) in rainy and winter season, respectively. There are large differences were observed between the minimum and maximum range leaf moisture content was varied from 45.16 to 78.51 per cent and leaf yield was varied from 235.90 to 29008.89 during rainy season. In winter season the range of leaf moisture content was varied from 15.28 to 72.35 per cent and leaf yield was varied from 94.43 to 2975.00 g. Phenotypic coefficient of variation (PCV %) was found to be higher than the respective genotypic coefficient of variation (GCV %) for all the characters denoting variability among genotypes in both the seasons. Estimates of phenotypic and genotypic coefficient of variations were high for leaf yield per plant (98.63, 98.49%) and (89.69, 89.62%) in rainy and winter season, respectively. Maximum heritability was observed for leaf yield per plant (99.71 %), (99.85 %) in rainy and winter season, respectively. High heritability coupled with high genetic advance as percent of mean in respect of number of days for first flower initiation, plant height and single leaf area at 45th, 60th, and 75th DAP, number of branches, leaf moisture content and leaf yield per plant was observed in rainy and winter seasons.
Aims: To identify the stable genotypes across the seasons for different yield and its contributing traits. Study Design: Field experimental design was used Place and Duration of Study: The experiment was conducted in different seasons during 2017-19 at Department of Sericulture, University of Agricultural Sciences, GKVK, Bangalore. Methodology: The present study comprised of six mulberry genotypes viz., MI-012, MI-79, MI-21, MI-139, MI-516, ME-05 and two popular check varieties V1 and M5. Results: The mean squares due to seasons was significant for total shoot length (cm), number of leaves per plant, leaf yield per plant (g), ten fresh leaf weight (g), leaf moisture content (%) at harvest, leaf moisture retention capacity (%) at 6 and 9 hrs after harvest. Analysis of variance indicated high significance of mean sum of squares due to season for number of branches per plant, number of leaves per plant, leaf yield per plant, single leaf area, moisture content and moisture retention capacity at 6 and 9 hrs after harvest of leaf. Further, it could be observed that variance due to seasons (linear) were highly significant for number of branches per plant, total shoot length, number of leaves per plant, ten fresh leaf weight, leaf yield per plant, single leaf area, moisture content and moisture retention capacity at 6 and 9 hrs after harvest of leaf. Whereas, variance due to G х S (linear) was non significant for shoot height, internodal distance, number of leaves per plant, ten fresh leaf weight, leaf yield per plant, moisture content and moisture retention capacity at 6 and 9 hrs after harvest of leaf. Variance due to pooled deviation was highly significant for shoot height, number of branches per plant, total shoot length, internodal distance, number of leaves per plant, ten fresh leaf weight, single leaf area, moisture content and moisture retention capacity at 6 and 9 hrs after harvest of leaf. Whereas, variance due to pooled deviation was non significant for leaf yield per plant.
In an aeroponic system, nutrients are directly delivered to the plant roots, which results in the faster growth of crops. Furthermore, aeroponics has been extensively used as a research tool for many difficult-to-propagate plant species. The present investigation shows that the plants grown under the aeroponic system were recorded maximum for all the growth parameters except leaf area which was found maximum under nursery conditions. Among treatments, T3 (three buds per cutting) recorded the maximum for all growth parameters followed by T2 (two buds per cutting) and T1 (one bud per cutting). The interaction effect between propagation systems and the number of buds per cutting showed significant results. S1T3 (three budded cuttings under aeroponic system) recorded maximum for growth parameters viz., intermodal length (4.27 cm), plant height (44.39 cm), number of leaves (16.91), leaf yield (10.79 g/plant), whereas least was recorded by S2T1 i.e., one budded cuttings under nursery (2.39 cm, 35.47 cm, 5.88, 4.84g /plant respectively) at 60 DAT. However, S2T3 recorded a maximum leaf area of 95.96 cm2. From these results, it can be concluded that the aeroponic system could be effectively used for the production of V-1 mulberry saplings.
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