期刊
PLANT SIGNALING & BEHAVIOR
卷 6, 期 4, 页码 467-470出版社
TAYLOR & FRANCIS INC
DOI: 10.4161/psb.6.4.14305
关键词
Zea mays; maize; phytochrome; shade avoidance syndrome; twilight; dusk; end-of-day far-red
资金
- Fonds Quebecois de la Recherche sur la Nature et les Technologies
- National Science Foundation [DBI-0501713]
Correlations were established between plant height and Cartesian position in a field of diverse maize (Zea mays) germplasm. The influence of the shade avoidance syndrome (SAS), a series of responses to lower photosynthetically active radiation (PAR) and red to far-red light ratio (R:FR) at high planting density, was detected by a steep increase of plant height from the edge to interior rows of the field. In addition, a gradual increase in height was observed across the field from east to west. We attribute this result to a R:FR gradient caused by sunlight laterally penetrating the stand at dusk. Furthermore, we hypothesize that the increased height of west-positioned plants may be analogous to responses induced by end-of-day FR (EOD-FR) treatments used by photobiologists to induce SAS in controlled environments. While preliminary, these results nevertheless suggest that a plant's position in a field will influence the impact of daily fluctuations in PAR and R:FR in modulating plant height and, potentially, other agronomically relevant traits.
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