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Characteristics of Gas Exchange and Chlorophyll Fluorescence in Different Position Leaves at Booting Stage in Rice Plants

机译：水稻孕穗期不同部位叶片气体交换和叶绿素荧光特性。

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摘要

To investigate the senescence of rice leaves at different positions at booting stage, gas exchange and chlorophyll fluorescence properties in leaves at different positions were examined by using six rice materials. The net rates of photosynthesis (P_n), stomatal conductance (g_s), transpiration rate (E) and water use efficiency (WUE) decreased significantly with lowering of leaf positions, while intercellular CO_2 concentration (C_i) had a little change, indicating that the decrease of photosynthetic rate was not resulted from the decrease of g_s. The decrease of SPAD reading which had a close correlation with chlorophyll content was one of apparent reasons resulting in the decease of P_n. Further evidence by chlorophyll fluorescence showed that the photochemical efficiency of PS Ⅱ and its electron transport rate (ETR) decreased substantially with lowering of the leaf positions but the variable-to-maximum fluorescence ratio (F_v/F_m) and efficiency of energy conversion of open PS Ⅱ (F_v'/F_m') remained rather stable, suggesting that primary limitation of P_n was suppression of electron transport of PS Ⅰ, and probably associated with carbon assimilation.
机译：为了研究水稻在孕穗期不同部位叶片的衰老，采用六种水稻材料研究了不同部位叶片的气体交换和叶绿素荧光特性。随着叶片位置的降低，光合作用的净速率（P_n），气孔导度（g_s），蒸腾速率（E）和水分利用效率（WUE）显着降低，而细胞间的CO_2浓度（C_i）变化很小，表明g_s的降低并不是光合速率降低的原因。与叶绿素含量密切相关的SPAD读数的下降是导致P_n下降的明显原因之一。叶绿素荧光的进一步证据表明，PSⅡ的光化学效率及其电子传递速率（ETR）随着叶位置的降低而显着降低，但最大/最大荧光比（F_v / F_m）和开放光能转换效率却有所不同。 PSⅡ（F_v'/ F_m'）保持稳定，表明P_n的主要局限是抑制PSⅠ的电子传递，可能与碳同化有关。

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