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The evolution of apical dominance in maize

Author

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  • John Doebley

    (University of Minnesota)

  • Adrian Stec

    (University of Minnesota)

  • Lauren Hubbard

    (USDA Plant Gene Expression Center
    University of California)

Abstract

The domestication of crop plants has often involved an increase in apical dominance (the concentration of resources in the main stem of the plant and a corresponding suppression of axillary branches)1. A striking example of this phenomenon is seen in maize (Zea mays spp. mays), which exhibits a profound increase in apical dominance compared with its probable wild ancestor, teosinte (Zea mays ssp. parviglumis)2. Previous research has identified the teosinte branched1 (tb1) gene as a major contributor to this evolutionary change in maize3. We have cloned tb1 by transposon tagging and show here that it encodes a protein with homology to the cycloidea gene of snapdragon4. The pattern of tb1 expression and the morphology of tb1 mutant plants suggest that tb1 acts both to repress the growth of axillary organs and to enable the formation of female inflorescences. The maize allele of tb1 is expressed at twice the level of the teosinte allele, suggesting that gene regulatory changes underlie the evolutionary divergence of maize from teosinte.

Suggested Citation

  • John Doebley & Adrian Stec & Lauren Hubbard, 1997. "The evolution of apical dominance in maize," Nature, Nature, vol. 386(6624), pages 485-488, April.
    • Handle: RePEc:nat:nature:v:386:y:1997:i:6624:d:10.1038_386485a0
    DOI: 10.1038/386485a0
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    Cited by:

    1. Jingqiu Lan & Ning Wang & Yutao Wang & Yidan Jiang & Hao Yu & Xiaofeng Cao & Genji Qin, 2023. "Arabidopsis TCP4 transcription factor inhibits high temperature-induced homeotic conversion of ovules," Nature Communications, Nature, vol. 14(1), pages 1-19, December.
    2. Jiguo Cao & Liangliang Wang & Zhongwen Huang & Junyi Gai & Rongling Wu, 2017. "Functional Mapping of Multiple Dynamic Traits," Journal of Agricultural, Biological and Environmental Statistics, Springer;The International Biometric Society;American Statistical Association, vol. 22(1), pages 60-75, March.
    3. Xiaofeng Cai & Xuepeng Sun & Chenxi Xu & Honghe Sun & Xiaoli Wang & Chenhui Ge & Zhonghua Zhang & Quanxi Wang & Zhangjun Fei & Chen Jiao & Quanhua Wang, 2021. "Genomic analyses provide insights into spinach domestication and the genetic basis of agronomic traits," Nature Communications, Nature, vol. 12(1), pages 1-12, December.

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