Plant Totipotency and Tissue Culture — NEET Biology
✅ Asked in NEET 2025As traditional breeding techniques failed to keep pace with demand and to provide sufficiently fast and efficient systems for crop improvement, another technology called tissue culture got developed. What does tissue culture mean? It was learnt by scientists, during 1950s, that whole plants could be regenerated from explants, i.e., any part of a plant taken out and grown in a test tube, under sterile conditions in special nutrient media. This capacity to generate a whole plant from any cell/explant is called totipotency. You will learn how to accomplish this in higher classes. It is important to stress here that the nutrient medium must provide a carbon source such as sucrose and also inorganic salts, vitamins, amino acids and growth regulators like auxins, cytokinins etc. By application of these methods it is possible to achieve propagation of a large number of plants in very short durations. This method of producing thousands of plants through tissue culture is called micro-propagation. Each of these plants will be genetically identical to the original plant from which they were grown, i.e., they are somaclones. Many important food plants like tomato, banana, apple, etc., have been produced on commercial scale using this method. Try to visit a tissue culture laboratory with your teacher to better understand and appreciate the process.
Totipotency is the ability of any single plant cell or explant to regenerate into a complete whole plant under sterile laboratory conditions. NTA tests this concept because it's fundamental to biotechnology and appears in tissue culture questions. Students often confuse totipotency with regeneration or forget that it applies to ANY plant cell/tissue. The key trap: thinking only certain cells possess this ability, or mixing it up with differentiation. Remember: totipotency = one cell → whole plant. The nutrient medium must contain sucrose (carbon source), inorganic salts, vitamins, and growth regulators (auxins, cytokinins) for successful culture. Micro-propagation uses this principle to produce genetically identical plants (somaclones) commercially.
The capacity to generate a whole plant from any cell of the plant is called:
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