Since nutrition does not appear to limit plant growth but it is still unknown how temperature affects photosynthesis and rose growth, I will be looking into studies that examine how temperature could affect different factors of a rose plant including nutrient uptake focusing on nitrogen, photosynthetic capacity, and plant growth. Specifically in rose cultivation, many factors such as nutrition and temperature may have a significant effect on the growth of the plant and the photosynthetic capacity of rose leaves (Ushio,Mae, & Makino, 2008). The day-night cycle can be examined to determine if nutrient influx, specifically nitrogen, as well as overall plant growth changes depending on the time of day as well as with temperature (Cárdenas-Navarro et al., 2017). Two experiments were performed that were completely identical with the exception of difference in temperature, one at 25 degrees celsius and the other at 20 degrees celsius. The choice in low temperatures for this type of experiment could have been chosen due to the fact that low temperatures increase the activity of many photosynthetic enzymes and enhancement of total nitrogen content on the leaf (effects of temperature). In this experiment conducted by (fill in name), cuttings were made with two leaves and two buds on miniature rose plants. There was a dark period and a light period where researchers observed the influx rates of NO3- during these two periods at different temperatures. The first experiment which was conducted at 25 degrees celsius, revealed that influx rates were very variable. The overall peak of NO3- influx occured about 6 hours after the dark period was introduced and then decreased after that and throughout the light period. A similar pattern was seen in experiment two at 20 degrees celsius where NO3- influx rates increased during the dark period and decreased during the light period. Results from these two experiments revealed widely variable NO3- influx rates during the diurnal cycle, where influx rates peaked during the dark period and then decreased during the light period (Day night cycle). One of the theories that was presented due to these results was that there is greater influx during the dark period due to the fact that sugars could be more available to the roots during the night. They also found that plants that were grown under the conditions of 25 degrees celsius conditions experienced a higher relative growth and a “higher hourly accumulation rate” of 60% more than the plants grown in the 20 degrees celsius conditions. This means that although both temperatures revealed the same pattern, the plants grown under the 25 degree celsius conditions experienced more NO3- influx.
In conclusion, Roses have become one of the most common and profitable flowering plants in the world. Since nutrition is one of the most important aspects of plant growth, I looked into studies that investigated how the influx rates changed throughout the day and at different temperatures. It can be concluded that lower temperatures allow for more nitrogen content on the leaf and more photosynthetic activity. The day-night cycle also plays a role in the influx rate of NO3-, where there was a higher rate during the dark periods. This suggests that when a perennial plant, such as a Rose, is grown under controlled conditions, external signals such as day length and temperature may play a secondary role.