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Plant Physiology 98:166-173 (1992)
© 1992 American Society of Plant Biologists

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Development and Growth Regulation

Rejuvenation of Sequoia sempervirens by Repeated Grafting of Shoot Tips onto Juvenile Rootstocks in Vitro 1

Model for Phase Reversal of Trees

Li-Chun Huang, Suwenza Lius, Bau-Lian Huang, Toshio Murashige, El Fatih M. Mahdi2 and Richard Van Gundy

Institute of Botany, Academia Sinica, Nankang, Taipei, Taiwan, Department of Botany and Plant Sciences, University of California, Riverside, California 92521

Repeated grafting of 1.5-centimeter long shoot tips from an adult Sequoia sempervirens tree onto fresh, rooted juvenile stem cuttings in vitro resulted in progressive restoration of juvenile traits. After four successive grafts, stem cuttings of previously adult shoots rooted as well, branched as profusely, and grew with as much or more vigor as those of seedling shoots. Reassays disclosed retention for 3 years of rooting competence at similar levels as originally restored. Adventitious shoot formation was remanifested and callus development was depressed in stem segments from the repeatedly grafted adult. The reversion was associated with appearance and disappearance of distinctive leaf proteins. Neither gibberellic acid nor N6-beneyladenine as nutrient supplements duplicated the graft effects.

2 Present address: Department of Horticulture, Faculty of Agriculture, University of Khartoum, Sudan.

1 Research supported in part by grants NSC-77-0201-B001-16 and NSC-78-0211-B001-08 to L.-C.H. from the Republic of China National Research Council and INT-8711887 to T.M. from the U.S. National Science Foundation.




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M. Onate and S. Munne-Bosch
Influence of plant maturity, shoot reproduction and sex on vegetative growth in the dioecious plant Urtica dioica
Ann. Bot., October 1, 2009; 104(5): 945 - 956.
[Abstract] [Full Text] [PDF]


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Copyright © 1992 by the American Society of Plant Biologists