Plant Growth Regulation

, 57:211 | Cite as

Role of cytokinin and salicylic acid in plant growth at low temperatures

Original Paper

Abstract

Low temperature restrains plant growth by inhibiting the cell cycle, and phytohormones play important roles in this case; however, the molecular mechanisms whereby phytohormones affect growth at low temperature are largely unknown. When grown at 23, 16, 10, and 4°C, we found that Arabidopsis thaliana could develop with normal morphology, but needed a prolonged period of cultivation. By screening mutants, we could implicate cytokinin and salicylic acid. At 4°C, both amp1 plants, which have an increased level of cytokinin, and wild-type plants treated with exogenous cytokinin, displayed relative growth rates greater than control by increasing total cell number. Additionally, transgenic NahG plants, which have lower salicylic acid content, grew faster than wild-type accompanied by larger cells. Expression of C-repeat binding transcription factors (CBFs), that mediate cold acclimation by stimulation of the expression of cold-inducible genes, was similar in all tested genotypes. Thus CBF expression did not correlate with the observed enhanced growth in mutants. The improved growth coincided with elevated expression of CYCD3;1, especially in NahG plants. At 4°C, enhanced endoreduplication took responsibility for larger cells in NahG plants, while enhanced cell division was observed in amp1 plants.

Keywords

Arabidopsis thaliana Cell cycle Low temperature amp1 NahG 

Notes

Acknowledgments

This work was supported by NSF of China (Grant No. 30328003), STM of China (Grant No. 2007CB948201) and PHR (IHLB) of Beijing Municipal Commission of Education to He. We are very grateful to Tobias I. Baskin (University of Massachusetts Amherst) for critical revision and comments on the manuscript and Ren Zhang (University of Wollongong, Australia) for invaluable discussions.

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Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  1. 1.College of Life ScienceCapital Normal UniversityBeijingChina
  2. 2.College of Life ScienceShanxi Normal UniversityLinfenChina

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