Measurements of OJIP–SMT patterns of fluorescence induction (FI) in Synechocystis sp. PCC 6803 (Synechocystis) cells on a time scale up to several minutes were mathematically treated within the framework of thylakoid membrane (T-M) model (Belyaeva et al., Photosynth Res 140:1–19, 2019) that was renewed to account for the state transitions effects. Principles of describing electron transfer in reaction centers of photosystems II and I (PSII and PSI) and cytochrome b₆f complex remained unchanged, whereas parameters for dissipative reactions of non-radiative charge recombination were altered depending on the oxidation state of Q_B-site (neutral, reduced by one electron, empty, reduced by two electrons). According to our calculations, the initial content of plastoquinol (PQH₂) in the total quinone pool of Synechocystis cells adapted to darkness for 10 min ranged between 20 and 40%. The results imply that the PQ pool mediates photosynthetic and respiratory charge flows. The redistribution of PBS antenna units responsible for the increase of Chl fluorescence in cyanobacteria (qT_{2 → 1}) upon state 2 → 1 transition or the fluorescence lowering (qT_{1 → 2}) due to state 1 → 2 transition were described in the model by exponential functions. Parameters of dynamically changed effective cross section were found by means of simulations of OJIP–SMT patterns observed on Synechocystis cells upon strong (3000 μmol photons m⁻²s⁻¹) and moderate (1000 μmol photons m⁻²s⁻¹) actinic light intensities. The corresponding light constant values kL_ΣAnt = 1.2 ms⁻¹ and 0.4 ms⁻¹ define the excitation of total antenna pool dynamically redistributed between PSII and PSI reaction centers. Although the OCP-induced quenching of antenna excitation is not involved in the model, the main features of the induction signals have been satisfactorily explained. In the case of strong illumination, the effective cross section decreases by approximately 33% for irradiated Synechocystis cells as compared to untreated cells. Under moderate light, the irradiated Synechocystis cells showed in simulations the same cross section as the untreated cells. The thylakoid model renewed with state transitions description allowed simulation of fluorescence induction OJIP–SMT curves detected on time scale from microseconds to minutes.

集胞藻中荧光诱导 (FI) 的 OJIP-SMT 模式的测量。在类囊体膜 (TM) 模型（Belyaeva 等人，Photosynth Res 140:1–19, 2019）的框架内对时间尺度长达几分钟的PCC 6803（集胞藻）细胞进行数学处理，该模型已更新以解释状态转换效果。描述光系统 II 和 I（PSII 和 PSI）和细胞色素b ₆ f复合物反应中心电子转移的原理保持不变，而非辐射电荷复合耗散反应的参数根据 Q _B的氧化态而改变-位点（中性，减少一个电子，空的，减少两个电子）。根据我们的计算，在适应黑暗 10 分钟的集胞藻细胞的总醌库中，质体醌 (PQH ₂ )的初始含量介于 20% 和 40% 之间。结果意味着 PQ 池介导光合作用和呼吸电荷流。PBS 天线单元的重新分布负责蓝藻中 Chl 荧光增加 (qT _{2 → 1} ) 在状态 2 → 1 转换或由于状态 1 → 2 转换导致的荧光降低 (qT _{1 → 2} ) 在模型中描述为指数函数。通过模拟观察到的 OJIP-SMT 图案，找到了动态变化的有效截面参数集胞藻细胞在强（3000 μmol 光子 m ^-2 s ^-1）和中等（1000 μmol 光子 m ^-2 s ^-1）光化光强度下。相应的光常数值 kL _ΣAnt  = 1.2 ms ^-1和 0.4 ms ^-1定义了在 PSII 和 PSI 反应中心之间动态重新分配的总天线池的激励。虽然模型中没有涉及 OCP 引起的天线激励猝灭，但已经令人满意地解释了感应信号的主要特征。在强光照的情况下，辐照后的集胞藻的有效截面减少约 33%细胞与未经处理的细胞相比。在中等光照下，受照射的集胞藻细胞在模拟中显示出与未处理细胞相同的横截面。用状态转换描述更新的类囊体模型允许模拟在从微秒到分钟的时间尺度上检测到的荧光诱导 OJIP-SMT 曲线。