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Science in China Series C: Life Sciences

, Volume 52, Issue 8, pp 693–700 | Cite as

Strigolactones are a new-defined class of plant hormones which inhibit shoot branching and mediate the interaction of plant-AM fungi and plant-parasitic weeds

  • CaiYan Chen
  • JunHuang Zou
  • ShuYing Zhang
  • David Zaitlin
  • LiHuang ZhuEmail author
Review

Abstract

Because plants are sessile organisms, the ability to adapt to a wide range of environmental conditions is critical for their survival. As a consequence, plants use hormones to regulate growth, mitigate biotic and abiotic stresses, and to communicate with other organisms. Many plant hormones function pleiotropically in vivo, and often work in tandem with other hormones that are chemically distinct. A newly-defined class of plant hormones, the strigolactones, cooperate with auxins and cytokinins to control shoot branching and the outgrowth of lateral buds. Strigolactones were originally identified as compounds that stimulated the germination of parasitic plant seeds, and were also demonstrated to induce hyphal branching in arbuscular mycorrhizal (AM) fungi. AM fungi form symbioses with higher plant roots and mainly facilitate the absorption of phosphate from the soil. Conforming to the classical definition of a plant hormone, strigolactones are produced in the roots and translocated to the shoots where they inhibit shoot outgrowth and branching. The biosynthesis of this class of compounds is regulated by soil nutrient availability, i.e. the plant will increase its production of strigolactones when the soil phosphate concentration is limited, and decrease production when phosphates are in ample supply. Strigolactones that affect plant shoot branching, AM fungal hyphal branching, and seed germination in parasitic plants facilitate chemical synthesis of similar compounds to control these and other biological processes by exogenous application.

Keywords

strigolactone shoot branching AM symbioses parasitic weed 

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Copyright information

© Science in China Press and Springer Berlin Heidelberg 2009

Authors and Affiliations

  • CaiYan Chen
    • 1
    • 2
  • JunHuang Zou
    • 1
    • 3
  • ShuYing Zhang
    • 1
  • David Zaitlin
    • 4
  • LiHuang Zhu
    • 1
    Email author
  1. 1.State Key Laboratory of Plant Genomics & National Plant Gene Research Centre (Beijing), Institute of Genetics and Developmental BiologyChinese Academy of SciencesBeijingChina
  2. 2.Department of Plant and Soil SciencesUniversity of KentuckyLexingtonUSA
  3. 3.Department of BiologyUniversity of UtahSalt Lake CityUSA
  4. 4.Kentucky Tobacco Research and Development Center (KTRDC)University of KentuckyLexingtonUSA

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