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首页> 外文期刊>Journal of Forestry Research >CO_2, H_2O exchange and stomatal regulation of regenerated Camptotheca acuminata plantlets during ex vitro acclimatization
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CO_2, H_2O exchange and stomatal regulation of regenerated Camptotheca acuminata plantlets during ex vitro acclimatization

机译：离体驯化过程中喜树喜树幼苗的CO_2，H_2O交换和气孔调节

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For finding the changes in CO_2, H_2O exchange and their stomatal regulation during ex vitro acclimatization of regenerated Camptotheca acuminata plantlets, the net photosynthesis rate (P_n), respiration rate (R_d), light compensation point (L_c) and light saturation point (L_s), transpiration rate (Tr), stomatal conductance (g_s) and water use efficiency(WUE) were measured during 37 days of ex vitro acclimatization. The results showed that P_n sharply increased until 29 days, then slightly decreased. A substantial decrease in L_c and a substantial increase of L_s in the former two weeks were observed, indicating the light regime enlargement for effective leaf photosynthesis. Tr and g_s abruptly decreased during the first week then linearly increased until 29days ex vitro acclimatization, reflecting the strong regulation effect of stomata on water changes of ex vitro acclimating plantlets. Stomatal regulation effect on CO_2 exchange was different from that on water exchange, i.e. P_n was almost independent of g_s during the first week, while P_n was significantly correlated with g_s thereafter (i.e. dual patterns). Different from dual patterns of g_s-P_n relation, the Tr monotonously linearly increased with g_s. Furthermore, WUE was almost independent on g_s during the first week, while a marked decreasing tendency with g_s was found thereafter. At the beginning of the acclimatization, WUE was mainly determined by photosynthetic capacity, while transpiration becomes a main determinant factor for WUE from 7 to 37 days' acclimatization.
机译：为了找到再生的喜树喜树幼苗离体适应过程中CO_2，H_2O交换的变化及其气孔调节，净光合速率（P_n），呼吸速率（R_d），光补偿点（L_c）和光饱和点（L_s）在离体驯化的37天中测量蒸腾速率（Tr），气孔导度（g_s）和水分利用效率（WUE）。结果表明，P_n急剧增加直至29天，然后略有下降。在前两周观察到L_c的大幅降低和L_s的大幅提高，这表明有效的叶片光合作用的光照范围扩大了。 Tr和g_s在第一周突然下降，然后线性增加，直到离体适应29天，反映出气孔对离体适应植物幼苗水分变化的强调节作用。气孔对CO_2交换的调节作用与对水交换的调节作用不同，即P_n在第一周几乎与g_s无关，而P_n与之后的g_s显着相关（即双重模式）。与g_s-P_n关系的对偶模式不同，Tr随着g_s单调线性增加。此外，在第一个星期，WUE几乎与g_s无关，而此后发现g_s显着下降的趋势。在适应开始时，WUE主要由光合作用能力决定，而蒸腾作用成为适应7至37天WUE的主要决定因素。

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