This study was performed to investigate how changing the period of light and dark influences the vegetative growth and the photosynthesis of Doritaenopsis Queen Beer ‘Mantefon’. Clones of Dtps. Queen Beer ‘Mantefon’ at 4-month-old stage were grown in a closed-plant factory system with four different light/dark cycles; 06/06 h, 08/08 h, 10/10 h, and 12/12 h. Temperature and relative humidity were set at 28oC and 80%, respectively, with a photosynthetic photon flux density of 160 ± 10 μmol·m-2·s-1. Repetitive measurements showed that the leaf length and the leaf width were the longest under 12/12 h closely followed by 10/10 h. The fresh weight and the dry weight of leaves and roots were the heaviest at 10/10 h treated samples. Different CO2 uptake patterns were observed from different light/dark cycles. Under 10/10 h and 12/12 h treatments, the CO2 uptake started at early dark period. When the light/dark cycles were shortened to 06/06 h and 08/08 h, the CO2 uptake started at the middle of dark period. Total CO2 uptake amounts were the highest under 12/12 h treatment followed by 10/10 h, 06/06 h, and 08/08 h treatments. Quantitative measurements showed that the vegetative growths under 10/10 h treatment were comparable with that of 12/12 h treatment. These studies indicated that manipulating light/dark can modify the photosynthesis patterns and vegetative growth of Dtps. Queen Beer ‘Mantefon’, resulting in the reduction of the production period.

China, the largest country of beer production and sales, has been seeing a continuous decline in annual sales in the past five years. As the main marketing body, beer producers should pay more attention to the research on consumer buying behavior. Using data from an online survey of 550 Chinese consumers, the author used binary logistic regression to empirically analyze consumers’ willingness to purchase dark beer. The factors affecting consumers’ purchase intentions regarding dark beer were divided into two aspects: individual characteristics and environmental factors. The results showed that in terms of individual characteristics, the consumer’s knowledge level and attitude toward beer had a significant positive impact on their willingness to buy dark beer. In terms of external environmental factors, the degree of consumer attention to the brand and scale of sales had a significant positive impact on the willingness to purchase dark beer, and the degree of consumer emphasis on product prices was significantly negatively correlated with the willingness to purchase. The influence of the other factors was not significant. In view of this situation, the author proposed four reasonable suggestions for beer companies, in order to improve consumers’ willingness to buy dark beer.