Effect of In Vitro Calcium Fortification on Regeneration and Microtuberization of Three Selected Irish Potato Varieties

Document Type : Research paper

Authors

1 Department of Horticulture and Food Security, Jomo Kenyatta University of Agriculture and Technology, Juja, Kenya

2 College of Agriculture and Natural Resources, Jomo Kenyatta University of Agriculture and Technology, Juja, Kenya

Abstract

Potato is an important tuber crop that has a unique role in the food security of sub-Saharan Africa. Potato production faces several challenges, including limited sources of clean seed and the occurrence of nutrient deficiencies in plants. The availability of clean and viable seeds is the most prevalent challenge which necessitates the development of new strategies for enhancing production. Understanding the link between in vitro nutrient enhancement and seedling vigor in field conditions can assist in mitigating the adverse effects of these challenges after micro plant transplanting. In vitro experiments were set up to investigate the effects of calcium (Ca) fortification on several potato varieties, i.e. ‘Shangi’, ‘Unica’, and ‘Dutch Robjyn’ regeneration and microtuberization. Cuttings were subcultured onto modified MS media containing five levels of CaCl2 8.8 g L-1, 10.4 g L-1, 12 g L-1, 13.6 L-1, and 15.2 g L-1. Microtubers were initiated on media with 60 g L-1 brown sugar and 6 mg L-1 6-Benzylaminopurine. The experiment was set up in a completely randomized design with three replications. The regeneration capacity of the tested varieties differed significantly, as evidenced by shoot (p=0.0002) and root count (p=<.0001). The response of plants to fortification was variably dependent. The application of 10.4-13.6 g L-1 led to a significant increase (p<0.05) in root count in all three varieties. Furthermore, 13.6 g L-1 CaCl2 led to an increase in root-zone and mid-stem Ca content by 45%, 202%, and 165% in ‘Shangi’, ‘Unica’, and ‘Dutch Robjyn’, respectively, compared to the control. The ‘Dutch Robjyn’ and ‘Shangi’ performed optimally in terms of regeneration and microtuberization, compared to ‘Unica’, under the
effect of 10.4-13.6 g L-1 CaCl2. The results confirmed the optimization of MS regeneration by Ca enhancement as a potential technology for scaling up the production of clean quality seeds. 

Keywords

References

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International Journal of Horticultural Science and Technology
Volume 10, Issue 4
October 2023
Pages 433-444

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History

  • Receive Date: 30 August 2022
  • Revise Date: 21 October 2022
  • Accept Date: 28 October 2022

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