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Estimating yields of illicit opium poppy requires knowledge of how climate and geography affect the crop. This experiment provided part of the database needed to predict flowering time and shoot bioma...ss of poppy (Papaver somniferum L., 'album DC') for any geographical location. Plants were grown in chambers under a 12, 13, 14, or 24-h photoperiod and a 12-h thermoperiod of 25/20℃. Plants at 10 or 20 days after emergence (DAE) were transferred to separate chambers and treated for 48h with either (a) 10℃ and a 12-h photoperiod or (b) continuous light and a 12-h thermoperiod of 25/20℃. The 48-h interruption of each photoperiod treatment with continuous light decreased days to flower (DTF) for photoperiods<24h for both seedling ages, the effect being more pronounced at 10 DAE and for the 12-h photoperiod. The 48-h 10℃ interruption had no effect on DTF. The poppy flower was an increasingly larger proportion of the shoot biomass (from 6 to 15%) as photoperiod increased from 12 to 24h. DTF, plant height and shoot dry weight showed the same pattern of response to photoperiod, having minimum values in the 24-h photoperiod treatment and increasing in values with photoperiods≤14h. Critical photoperiod, P_c, was calculated as 14.8h, by plotting DTF against photoperiod as two straight lines and determining their point of intersection. A similar approach using the reciprocal of DTF gave a P_c of 16h. Shoot dry weights from all treatments were found to be an exponential function of DTF. Results indicate that plant biomass at flowering can be estimated simply by knowing how photoperiod and temperature affect DTF. This result presupposes that the number of photosynthetically active days between plant emergence and flowering is the primary determinant of biomass. If environmental conditions irretrievably limit photosynthetic activity during this period, biomass would be overestimated.続きを見る
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Mendeley出力
KJ00004506859