Journal
SCIENCE
Volume 340, Issue 6136, Pages 1097-1100Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1234340
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Funding
- National Natural Science Foundation of China [31222029, 912173023]
- State Key Basic Research Program of China [2013CB127000]
- Shanghai Pujiang Program [12PJ1409900]
- Recruitment Program of Global Experts (China)
- NKLPMG (SIPPE, SIBS)
- Open Project Program of NKLPMG (SIPPE, SIBS)
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Plants flower in response to many varied cues, such as temperature, photoperiod, and age. The floral transition of Cardamine flexuosa, a herbaceous biennial-to-perennial plant, requires exposure to cold temperature, a treatment known as vernalization. C. flexuosa younger than 5 weeks old are not fully responsive to cold treatment. We demonstrate that the levels of two age-regulated microRNAs, miR156 and miR172, regulate the timing of sensitivity in response to vernalization. Age and vernalization pathways coordinately regulate flowering through modulating the expression of CfSOC1, a flower-promoting MADS-box gene. The related annual Arabidopsis thaliana, which has both vernalization and age pathways, does not possess an age-dependent vernalization response. Thus, the recruitment of age cue in response to environmental signals contributes to the evolution of life cycle in plants.
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