Density effects on late flowering mutants of <i>Arabidopsis thaliana</i> under continuous light

• Yamamoto Kiwako

  Department of Natural Sciences, International Christian University (ICU)

• Takahashi Kei

  Department of Natural Sciences, International Christian University (ICU)

• Hara Miyuki

  Department of Natural Sciences, International Christian University (ICU) Gene Research Center, University of Tsukuba

• Miyata Kana

  Department of Natural Sciences, International Christian University (ICU)

• Hayama Ryosuke

  Department of Natural Sciences, International Christian University (ICU)

• Mizoguchi Tsuyoshi

  Department of Natural Sciences, International Christian University (ICU)

Bibliographic Information

Other Title

• Density effects on late flowering mutants of Arabidopsis thaliana under continuous light

Abstract

In general, plant growth is inhibited under high-density conditions, while it is promoted under low-density conditions. This is known as the “density effect”. Growing plants at high densities is often associated with an accelerated flowering time. Three major pathways [the long day (LD), gibberellic acid (GA), and autonomous/vernalization pathways] are known to play important roles in the control of flowering time. Circadian clock genes, namely, LHY, CCA1, GI, and ELF3, regulate the LD pathway. GAI and FCA control flowering via GA and autonomous pathways, respectively. The density effect on plant size is caused by specific factors such as the amount of nutrition obtained from the soil and touch frequency among plants. However, the molecular mechanism underlying the acceleration of flowering time due to density effects remains unclear. Here, we show the density effects on three Brassicaceae plants, namely, Brassica rapa var. nipposinica, Brassica napus, and Brassica chinensis f. honsaitai. They showed shorter stems and leaves when grown at high densities on soil under continuous light (LL). Shorter stems and leaves, as well as accelerated flowering times, were observed when a model plant, Arabidopsis thaliana, was grown under the same conditions. Unexpectedly, ethylene insensitive 2 (ein2) showed no differences in density effects in our experiments. The acceleration of flowering at higher densities was largely suppressed by gai, but not by gi, lhy;cca1, or fca. These results suggest that the promotion of flowering (as a density effect) is likely dependent on the GA pathway, but not the LD or autonomous pathways.

Journal

• Plant Biotechnology

  Plant Biotechnology 33 (4), 323-331, 2016

  Japanese Society for Plant Biotechnology

Keywords

• Arabidopsis
• density effects
• flowering time
• gibberellic acid
• law of constant final yield

Details

• CRID: 1390282679306226432
• NII Article ID: 130005281093
• NII Book ID: AA11250821
• DOI: 10.5511/plantbiotechnology.16.0622a
• ISSN: 13476114
• ISSN: 13424580
• NDL BIB ID: 027729180
• Web Site: http://id.ndl.go.jp/bib/027729180
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I027729180
• Web Site: https://www.jstage.jst.go.jp/article/plantbiotechnology/33/4/33_16.0622a/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed