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Plant Physiology 71:639-644 (1983)
© 1983 American Society of Plant Biologists

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Articles

Gibberellins and Heterosis in Maize 1

I. Endogenous Gibberellin-Like Substances

Stewart B. Rood2, Richard P. Pharis3, Masaji Koshioka and David J. Major

Department of Biology, University of Calgary, Calgary Alberta T2N 1N4 Canada, Agriculture Canada Research Station, Lethbridge, Alberta T1J 4B1 Canada

Under controlled environment and/or field conditions, vegetative growth (height, internode length, leaf area, shoot dry weight, grain yield) was greater in an F1 maize hybrid than in either parental inbred. Endogenous gibberellin (GA)-like substances in apical meristem cylinders were also higher in the hybrid than in either inbred, both on a per plant and per gram dry weight basis. There were no apparent qualitative differences in GA-like substances, however. Levels of GA-like substances in all genotypes were highest prior to tassel initiation. Chromatographic comparisons of the GA-like substances and authentic standards of GA native to maize on gradient-eluted SiO2 partition and reverse-phase C18 high-pressure liquid chromatography columns are described. No consistent differences in abscisic acid levels of the three genotypes were observed. This correlation of heterosis for endogenous GA-like substances with heterosis for growth suggests that amounts of endogenous GA may be related to hybrid vigor in maize.

2 Present address: Faculty of Forestry, University of Toronto, Toronto, Ontario M5S 1A1.

3 To whom requests for reprints should be sent.

1 Supported in part by Natural Sciences and Engineering Research Council Grant A-2585 to R. P. Pharis.




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S. B. ROOD, R. I. BUZZELL, L. N. MANDER, D. PEARCE, and R. P. PHARIS
Gibberellins: A Phytohormonal Basis for Heterosis in Maize
Science, September 2, 1988; 241(4870): 1216 - 1218.
[Abstract] [PDF]


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Copyright © 1983 by the American Society of Plant Biologists