Morpho-biometric and Cytogenetic analysis of Clone-selected Mulberry Cultivars (Morus Spp.)

Ravi Kumara R¹, HL Ramesh² and HB Manjunatha¹*

¹Department of Studies in Sericulture Science, University of Mysore, Mysuru, Karnataka, India
²Department of Sericulture, Visveswarapura College of Science, Bengaluru, Karnataka, India

*Corresponding Author: HB Manjunatha, Department of Studies in Sericulture Science, University of Mysore, Mysuru, Karnataka, India.

Received: May 03, 2021; Published: May 26, 2021

Abstract

  Genetic variation is uncommon in mulberry (Morus spp.) cultivars due to its asexual propagation and shows the considerable phenotypic plasticity to adopt different agro-climatic conditions. These open an ample scope for the selection of superior clones for better leaf yield and quality. To uncover this cryptic feature, we have selected clonally evolved mulberry cultivars TG-1, Anantha, and Vishala and compared them with their putative mother plants M-5, RFS-135, and S-1635 respectively. Interestingly, significant variations are obvious in all clonally-selected mulberry cultivars with their respective putative mother plants. Comparatively, the plant height, the number of branches, leaf yield, and survival percentage were higher in TG-1, Anantha, and Vishala over M-5, RFS-135, and S-1635 cultivars respectively. Furthermore, altered anatomical structures - thick cuticle, fewer and smaller stomata in TG-1, Anantha, and Vishala leaves are positively correlated with moisture conservation and drought adaptation. Besides, clonally-selected mulberry cultivars had significantly higher leaf moisture, soluble protein, and sugar contents. The cytological evidence shows that RFS-135 and Anantha have 2n=2x=28 (Diploids), M-5 and TG-1 also exhibit 2n=2x=28; but Vishala and S-1635 possess 2n=3x=42 (Triploids). We hypothesize that discrete morphological, anatomical, and biochemical variations in clonally-selected mulberry cultivars compared to their putative mother plants are due to no gain or loss in chromosomal complements, rather to repetitive DNA sequence or related epigenetic modifications.

Keywords: Mulberry; Chromosome; Clonal Selection; TG-1; Anantha; Vishala

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Citation

Citation: HB Manjunatha., et al. “Morpho-biometric and Cytogenetic analysis of Clone-selected Mulberry Cultivars (Morus Spp.)". Acta Scientific Agriculture 5.6 (2021): 92-101.

Copyright

Copyright: © 2021 HB Manjunatha., et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.