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Histo-physiological gradients and plant organogenesis (Part II)

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Conclusion

In the two parts of this memoir we have tried to present the complex subject of gradients in plants. In the first part (210) physico-chemical and physiological gradients have been described and their connections with growth (auxetic) gradients discussed. Correlations between them can be schematized as follows:

In the second part histological and anatomical gradients are examined, examples being chosen among grasses, pines, potatoes, etc. Dermograms of grasses have shown that some tissues strikingly reveal a network of isopotential lines giving evidence of the graded influences that govern their early differentiation. Finally the most interesting and also the most difficult point of our study—modifications of the gradient system by external factors —was approached. The influence of chemical, physical and biotic agents is discussed, with reference to the amazing case of galls. If man becomes able to modify at will the gradients of a plant, he will be endowed with the ability to mould living matter according to his needs. At present hundreds of biologists are independently working on the subject of gradients in animals and plants. Coordination of their efforts and convergence of the latter toward detecting all means of modifying growth and metabolic gradients would open an unlimited new field of applications for the future welfare of mankind.

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    Henri Prat

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Prat, H. Histo-physiological gradients and plant organogenesis (Part II). Bot. Rev 17, 693–746 (1951). https://doi.org/10.1007/BF02880965

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