Effect of Temperature and Illuminance on the Growth of Brassica
The effect of temperature on the growth of Brassica is more studied. Wu Hongxi and other studies have shown that in the temperature of 10 ~ 30 °C seawater, Brassica can maintain normal growth, the optimum temperature is 15 ~ 25 °C, while the Brassica can not survive in the temperature of 40 °C seawater, at 35 °C Can not maintain normal growth for a long time. Sun Xiutao and other small meteorological stations, studies have shown that at 40 °C cultured 40 h, part of the algae tuber body began to turn yellow. Studies by Ren Song et al. showed that Brassica oleracea died at 3 d higher than 32 °C. The results showed that in the range of temperature 5 to 15°C and light intensity of 4 to 40 μmol (/m2·s), the light intensity decreased as the temperature decreased, the specific growth rate of B. pelleri showed a downward trend, and its fluorescence activity was also corresponding Changes occurred at 5°C and 4 μmol/(m2·s), the growth rate of the algae was the lowest, but the specific growth rate of about 5% could still be maintained, and the maximum light quantum yield was also the lowest in the experimental group.
Brassica usually lives in a well-lit intertidal zone and grows well at a water depth of 2.5m. It is mainly attached to various substrates such as rock and gravel. It cannot actively adapt to changes in light intensity through vertical movement. Therefore, the light intensity is also one of the main factors that determine the distribution area of ​​Brassica. Through hand-held meteorological stations, studies have shown that Brassica oleracea dies at a low light intensity of 0 to 1 μmol/(m2·s) for 7 days, and at a light intensity of 20 μmol/(m2·s) or more, algae can grow. However, it grows fastest under light intensity of 100-120 μmol/(m2·s). Under strong light conditions of more than 200 μmol (/m2·s), the growth turns slow, but the algae growth still increases. The data shows that there is no significant influence of light intensity on the growth of B. campestris without temperature. When the light intensity is 20-30 μmol (/m2·s), the B. campestris can maintain a good growth state in the case of slow growth. When the light intensity exceeds 30 μmol (/m2·s), a rapid growth tendency is exhibited.
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