"SOC1" is a MADS-box-type gene, which integrates responses to photoperiod, vernalization and gibberellins. Murray cod spawn in spring, cued by rising water temperatures and increasing photoperiod (daylight length). Females of colonies living at high elevation enter estrus as the photoperiod increases. Initiation of flowering is sensitive to photoperiod and sesame variety. Hatching is triggered in response to specific stimuli such as increasing photoperiod and temperatures. Day-neutral cultivars produce flowers regardless of the photoperiod. Plants that flower in response to photoperiod may have a facultative or obligate response. Moulting is affected by the photoperiod. Token stimuli can consist of changes in photoperiod, thermoperiod, or allelochemicals from food plants. The photoperiod also significantly influences how fast the corms grow. Each plant has a different length critical photoperiod, or critical night length. Long-day plants flower when the night length falls below their critical photoperiod. Corms begin to develop much more slowly if the photoperiod exceeds 12 hours. Day-neutral plants are those that flower regardless of photoperiod. The wheat require a cold period before being able to respond to the photoperiod.