The effect of water stress on the energy use and growth of Cassia bicapsularis

The effects of water stresses on the energy utilization and growth of two-year-old seedlings of Cassia bicapsularis were studied in order to reduce the use of water during maintenance. The results showed that the growth of Cassia bicapsularis was not affected by mild drought (soil water content between 15 and 25%) for 5 days. There were no significant differences in the biomass, pigment and growth between the mild drought group and the control group after 19 days. In garden maintenance, mild drought not only ensures the growth of Cassia bicapsularis, but also saves the cost of irrigation. Moderate drought (soil water content between 10 and 15%) for 5 days had little effect on plant growth. After a 19-day moderate drought, the growth of Cassia bicapsularis was significantly inhibited, the energy transfer and fixation decreased slightly, and the energy consumption increased. Moderate drought for 20 days was the tolerable range for Cassia bicapsularis. Severe drought (soil water content less than 10%) seriously threatened the plants. The plants died after 23 days of severe drought. After flooding for 31 days, there were many aerial roots floating on the water surface of the stem base. The energy transfer, transfer and fixation of the water-flooded stem base decreased slightly, and the energy consumption increased. The plants could adopt to flood for over 90 days. During the course of the maintenance, the light drought did not affect the growth of Cassia bicapsularis, the moderate drought could not exceed 19 days, and the severe drought could not exceed 13 days. Flooding for 90 days did not affect plant growth.