Although high atmospheric temperatures suppress anthocyanin accumulation in most plant species,we show that high temperatures accelerate anthocyanin pigmentation in flower tepals of Asiatic hybrid lilies(Lilium spp.)....Although high atmospheric temperatures suppress anthocyanin accumulation in most plant species,we show that high temperatures accelerate anthocyanin pigmentation in flower tepals of Asiatic hybrid lilies(Lilium spp.).After incubation at high temperatures(35℃)for two days,anthocyanin color became deeper in the most of tepal parts of two Asiatic hybrid lily cultivars,although the basal parts of’Montreux’tepals and top parts of’Toronto’outer tepals were whitened.Environmental stimuli often affect the expression of R2R3-MYB positive regulators that control anthocyanin biosynthesis.Although their expression is often suppressed by hot temperatures in other species,the expression of lily MYB12 in tepals was upregulated by high temperatures.MicroRNA828(miR828),which suppresses the action of MYB12 post-transcriptionally,exhibited reduced accumulation levels under high temperature,indicating that miR828 regulation is involved in MYB12 upregulation.In addition,transcription levels of MYB12,estimated by unspliced MYB12 transcript accumulation,were also activated by high temperatures.Thus,both suppressed miR828 accumulation and increased MYB12 transcription are likely to be involved in MYB12 activation at high temperatures.In the whitened basal parts of’Montreux’tepals at 35℃,expression of bHLH2 was severely suppressed while that of MYB12 was not affected.The present results demonstrate that plants display diverse responses to hot climatic conditions and shed new light on anthocyanin regulation under various environmental conditions.展开更多
Dear Editor,In plants, the floral transition is flexibly controlled by various environmental conditions and endogenous developmental cues. In Arabidopsis, six major flowering pathways respond to changes in these facto...Dear Editor,In plants, the floral transition is flexibly controlled by various environmental conditions and endogenous developmental cues. In Arabidopsis, six major flowering pathways respond to changes in these factors （Fornara et al., 2010）. The photoperiod, vernalization, and ambient pathways monitor exogenous signals from the environment such as day length, minimum winter temperature, and ambient temperature （Fornara et al., 2010）. By contrast, the autonomous, gibberellin, and age pathways respond to endogenous cues linked to developmental status （Fornara et al., 2010）. Accumulating evidence indicates that the six flowering pathways converge in a network to regulate floral integrator genes FLOWERING LOCUS T （FT）, TWIN SISTER OF FT （TSF）, and SUPPRESSOR OF OVEREXPRESSION OF CONSTANS1 （Fornara et al., 2010）.展开更多
基金supported by a Grant-in-Aid for Scientific Research (Grant No.19H02945) from the Japan Society for the Promotion of Science。
文摘Although high atmospheric temperatures suppress anthocyanin accumulation in most plant species,we show that high temperatures accelerate anthocyanin pigmentation in flower tepals of Asiatic hybrid lilies(Lilium spp.).After incubation at high temperatures(35℃)for two days,anthocyanin color became deeper in the most of tepal parts of two Asiatic hybrid lily cultivars,although the basal parts of’Montreux’tepals and top parts of’Toronto’outer tepals were whitened.Environmental stimuli often affect the expression of R2R3-MYB positive regulators that control anthocyanin biosynthesis.Although their expression is often suppressed by hot temperatures in other species,the expression of lily MYB12 in tepals was upregulated by high temperatures.MicroRNA828(miR828),which suppresses the action of MYB12 post-transcriptionally,exhibited reduced accumulation levels under high temperature,indicating that miR828 regulation is involved in MYB12 upregulation.In addition,transcription levels of MYB12,estimated by unspliced MYB12 transcript accumulation,were also activated by high temperatures.Thus,both suppressed miR828 accumulation and increased MYB12 transcription are likely to be involved in MYB12 activation at high temperatures.In the whitened basal parts of’Montreux’tepals at 35℃,expression of bHLH2 was severely suppressed while that of MYB12 was not affected.The present results demonstrate that plants display diverse responses to hot climatic conditions and shed new light on anthocyanin regulation under various environmental conditions.
文摘Dear Editor,In plants, the floral transition is flexibly controlled by various environmental conditions and endogenous developmental cues. In Arabidopsis, six major flowering pathways respond to changes in these factors （Fornara et al., 2010）. The photoperiod, vernalization, and ambient pathways monitor exogenous signals from the environment such as day length, minimum winter temperature, and ambient temperature （Fornara et al., 2010）. By contrast, the autonomous, gibberellin, and age pathways respond to endogenous cues linked to developmental status （Fornara et al., 2010）. Accumulating evidence indicates that the six flowering pathways converge in a network to regulate floral integrator genes FLOWERING LOCUS T （FT）, TWIN SISTER OF FT （TSF）, and SUPPRESSOR OF OVEREXPRESSION OF CONSTANS1 （Fornara et al., 2010）.
