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Plant Physiology 55:90-93 (1975)
© 1975 American Society of Plant Biologists

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Articles

Cytokinin Effects on Growth of Quiescent Tobacco Pith Cells 1

George L. Hagen and Abraham Marcus

a The Institute for Cancer Research, Fox Chase Center for Cancer and Medical Sciences, Philadelphia, Pennsylvania 19111

Excised pith tissue from Nicotiana glauca or the tumor-prone hybrid N. glauca x N. langsdorffii has no growth requirement for exogenous cytokinins. Addition of kinetin to cultures of these lines results in growth inhibition at a kinetin concentration 1000-fold lower than the optimal level for kinetin-requiring lines. Cytological comparison of the kinetin-inhibited 2N hybrid and glauca tissues with pith from the kinetin-requiring N. tabacum var. Wisconsin 38 suggests that the nature of the cytokinin action is similar in both situations and that the primary function of cytokinin, when it stimulates growth, may be to curtail cell expansion, thereby facilitating a balance of cell expansion and division requisite for maximal growth.

1 This investigation was supported in part by Grant CA-04890 from National Institutes of Health, in part by Grant GB-35585X1 from National Science Foundation, in part by an Institutional Grant CA-06927 from National Institutes of Health, and in part by an appropriation from the Commonwealth of Pennsylvania.






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ASPB Publications PLANT PHYSIOLOGY THE PLANT CELL
Copyright © 1975 by the American Society of Plant Biologists