Sex-related and stage-dependent source-to-sink transition in Populus cathayana grown at elevated CO(2) and elevated temperature.
Sex-related and stage-dependent source-to-sink transition in Populus cathayana grown at elevated CO(2) and elevated temperature.
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DOI：
10.1093/treephys/tps074
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发表时间：
2012-11
期刊：
影响因子：
4
通讯作者：
Hongxia Zhao;Yongping Li;Xiaolu Zhang;H. Korpelainen;Chunyang Li
中科院分区：
文献类型：
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作者：
Hongxia Zhao;Yongping Li;Xiaolu Zhang;H. Korpelainen;Chunyang Li
雌雄异株植物有14,620多种，是陆地生态系统的重要组成部分。因此，了解 CO(2) 升高时平衡碳 (C) 供应和需求的性二态性反应对于理解叶库到源的转变非常重要。在这里，我们研究了雌雄异体的青杨（Populus cathayana Rehd）的性别相关反应。导致 CO(2) 升高和温度升高。植物在环境控制的生长室中生长，具有两种 CO(2) 富集方案（350 ± 20 和 700 ± 20 μmol mol(-1)），具有两个温度水平，分别升高 0 和 2 ± 0.2 °C（与室外环境相比）。研究了雄性和雌性发育叶（DL）和展开叶（EL）的植物生长特性、碳水化合物积累、碳和氮（N）分配、光合能力、氮利用效率和叶肉细胞形态。升高的CO(2)提高了雄性和雌性DL的植物生长和光合能力，并导致雄性EL在同一叶期与雌性相比具有更高的叶产量、净光合速率(P(n))、叶绿素a/b比(Chl a/b)、可溶性蛋白水平(SP)、光合氮利用效率和可溶性糖水平。升高的温度增强了 CO(2) 富集过程中的源活动和氮吸收状态，并且联合处理诱导雄性在库容量方面比雌性更敏感，尤其是在 EL 中，这可能是由于从植物其他部分获取了更多的氮。我们的研究结果表明，升高的CO(2)增加了青杨幼苗的库能力，升高的温度增强了升高的CO(2)对植物生长的刺激作用。研究发现，在 CO(2) 升高、总叶中氮含量减少的情况下，雄性 EL 在从根和茎获取氮方面发挥着重要作用。了解性别特异性叶片对气候变暖的适应性可以帮助我们了解雌雄异株植物物种中与性别相关的源到库的转变。
Dioecious plants, which comprise more than 14,620 species, account for an important component of terrestrial ecosystems. Hence, understanding the sexually dimorphic responses in balancing carbon (C) supply and demand under elevated CO(2) is important for understanding leaf sink-to-source transitions. Here we investigate sex-related responses of the dioecious Populus cathayana Rehd. to elevated CO(2) and elevated temperature. The plants were grown in environmentally controlled growth chambers at two CO(2) enrichment regimes (350 ± 20 and 700 ± 20 μmol mol(-1)) with two temperature levels, elevated by 0 and 2 ± 0.2 °C (compared with the out-of-chamber environment). Plant growth characteristics, carbohydrate accumulation, C and nitrogen (N) allocation, photosynthetic capacity, N use efficiency and the morphology of mesophyll cells were investigated in the developing leaves (DLs) and expanded leaves (ELs) of both males and females. Elevated CO(2) enhanced plant growth and photosynthetic capacity in DLs of both males and females, and induced the male ELs to have a greater leaf mass production, net photosynthesis rate (P(n)), chlorophyll a/b ratio (Chl a/b), soluble protein level (SP), photosynthetic N use efficiency and soluble sugar level compared with females at the same leaf stage. Elevated temperature enhanced source activities and N uptake status during CO(2) enrichment, and the combined treatment induced males to be more responsive than females in sink capacities, especially in ELs, probably due to greater N acquisition from other plant parts. Our findings showed that elevated CO(2) increases the sink capacities of P. cathayana seedlings, and elevated temperature enhances the stimulation effect of elevated CO(2) on plant growth. Male ELs were found to play an important role in N acquisition from roots and stems under decreasing N in total leaves under elevated CO(2). Knowledge of the sex-specific leaf adaptability to warming climate can help us to understand sex-related source-to-sink transitions in dioecious plant species.