The aim of this study was to develop and validate growth and photosynthetic models of Kimchi cabbages under extreme temperature conditions at different growth stages. Kimchi cabbage plants were subjected to low and high air temperatures 7–10 days after transplanting (DAT) and 40–43 DAT using extreme weather simulators. Except during these periods, the air temperature, relative humidity, solar radiation, and precipitation were set according to previous meteorological data. The experiments were performed over two years: in the first year, data were used to develop the models; the second-year experimental data were used for validation. The growth parameters and relative growth rate of Kimchi cabbage decreased due to low and high air temperature treatments. Photosynthetic CO₂ response curves, which were measured using a portable gas exchange system, were used to calculate three biochemical parameters from measured data: photochemical efficiency, carboxylation conductance, and dark respiration. These parameters were used to develop the photosynthetic models (modified Thornley’s models) representing predictions of net photosynthetic rate by CO₂ concentration and growth stage. The simulated photosynthetic rate with extreme high temperature treatment (35/31 °C) was 19.7 μmol m⁻² s⁻¹ which was evaluated approximately 3% deduction compared with control. Results of this study indicate that the growth and photosynthetic models developed here could be applied to evaluate retarded growth and net photosynthetic rate under extreme temperature conditions.

中文翻译：

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根据极端天气条件评估泡菜白菜的生长和光合作用

这项研究的目的是开发和验证泡菜在不同生长阶段的极端温度条件下的生长和光合作用模型。使用极端天气模拟器，将泡菜白菜植株在移植后（DAT）7–10天和40–43 DAT置于高低温下。除此期间外，气温，相对湿度，太阳辐射和降水是根据以前的气象数据设定的。实验进行了两年：第一年，使用数据开发模型；第二年的实验数据用于验证。由于低温和高温空气处理，泡菜白菜的生长参数和相对生长速率降低。光合CO ₂使用便携式气体交换系统测量的响应曲线用于从测量数据中计算三个生化参数：光化学效率，羧化电导率和暗呼吸。这些参数用于建立光合作用模型（修改后的Thornley模型），该模型表示通过CO ₂浓度和生长期预测净光合速率。极端高温处理（35/31°C）的模拟光合作用速率为19.7μmolm ^-2 s ^-1与对照组相比，其扣除率约为3％。这项研究的结果表明，这里开发的生长和光合作用模型可以用于评估在极端温度条件下的延迟生长和净光合速​​率。