89. 貧栄養ストレスはアオウキクサの花成と内生サリチル酸量の増加を誘導する(口頭発表,植物化学調節学会第46回大会)

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Plants can be induced to flower when stressed, and this flowering is called stress-induced flowering. The plants that flowered by stress reached anthesis, produced fertile seeds, and the progeny developed normally. The stress-induced flowering was accompanied by an increase in phenylalanine ammonia-lyase (PAL) activity. The flowering was inhibited by PAL inhibitors such as aminooxyacetic acid (AOA) and L-2-aminooxy-3-phenylpropionic acid (AOPP), and this inhibition was reversed by salicylic acid (SA). These facts suggest that SA is involved in the regulating mechanism of stress-induced flowering. The short-day plant Lemna paucicostata was induced to flower when cultured in tap water without any additional nutrient components under non-inductive, long-day conditions. Cultivation in tap water functioned as a stress factor, and therefore this flowering is categorized in stress-induced flowering. Flowering occurred in all three of the tested strains, but these stress-induced flowering response were weaker than those induced by short-day treatment in each strain. Strain 6746 was the most sensitive to poor-nutrition stress, ant its flowering was completely inhibited by PAL inhibitors. Significantly higher amounts of endogenous SA were detected in fronds that flowered under poor-nutrition conditions than in control fronds cultured under nutrient-rich conditions. SA may thus play a role in the regulating mechanism of stress-induced flowering.
2011-10-03