Photosynthetic acclimation of an evergreen broadleaved shrub (Ammopiptanthus mongolicus) to seasonal climate extremes on the Alxa Plateau, a cold desert ecosystem
Photosynthetic acclimation of an evergreen broadleaved shrub (Ammopiptanthus mongolicus) to seasonal climate extremes on the Alxa Plateau, a cold desert ecosystem
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寒冷沙漠生态系统阿拉善高原常绿阔叶灌木（沙冬青）对极端季节性气候的光合适应
DOI：
10.1007/s00468-018-1659-2
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发表时间：
2018-01
期刊：
影响因子：
--
通讯作者：
Shi Sha
中科院分区：
文献类型：
--
作者：
Li Zhengzhen;Li Ximeng;Rubert Nason Kennedy F;Yang Qiong;Fu Qiang;Feng Jinchao;Shi Sha
沙冬青在寒冷的沙漠环境中生存的关键信息是春季和夏季的高光合作用速率以及冬季寒冷的有效光保护策略。摘要生活在寒冷沙漠生态系统中的木本常绿植物必须在长期干旱和较大的季节温度变化中保持其叶片。为了了解常绿植物在这些环境中生存的策略，我们监测了沙冬青叶片气体交换和光合作用特性的季节变化。沙冬青是一种常绿阔叶灌木，原产于中国西北部寒冷的沙漠。结果表明，春、夏季光合作用相对较高，秋、冬季较低。从春季过渡到夏季，沙打旺保持了较高的光合作用能力(Amax)。进入秋季，最大气孔导度(Gsmax)和最大气孔导度(Gsmax)降低，而相对气孔对光合作用的限制(Ls)增大。与其他季节相比，冬季沙打旺的Amax、光系统II的最大量子效率(Fv/Fm)、最大Rubisco羧化速率(Vcmax)、最大RuBP再生速率(Jmax)和光合氮素利用效率(PnuEmax)都有所下降。总而言之，这些结果表明。沙棘在生理上适应春夏两季最大限度地吸收碳，并在冬季以光合作用为代价最大限度地提高叶片对冷胁迫的抵抗力。在冬季极端温度下，叶片通过黑暗持续的热能耗散保护其免受光氧化伤害。总体而言，我们的研究表明，不同季节的多重光合作用调节使寒冷的沙漠常绿植物得以生存。
Key messageSurvival ofAmmopiptanthus mongolicusin a cold desert environment is facilitated by high photosynthesis rates in spring and summer, and efficient photoprotective strategies in winter cold.AbstractWoody evergreen plants inhabiting cold desert ecosystems must retain their foliage amidst chronically dry conditions and large seasonal temperature variations. To understand the strategies enabling survival of evergreens in these environments, we monitored seasonal changes in foliar gas exchange and photosynthetic traits ofAmmopiptanthus mongolicus, an evergreen broadleaved shrub native to the cold desert of northwestern China. We found that photosynthesis was relatively higher in spring and summer and lower in fall and winter. Transitioning from spring to summer,A. mongolicusmaintained high photosynthetic capacity (Amax). Transitioning into fall, theAmaxand maximum stomatal conductance (gsmax) decreased, while the relative stomatal limitation to photosynthesis (Ls) increased. In winter,A. mongolicusdecreasedAmax, maximum quantum efficiency of photosystem II (Fv/Fm), maximum RuBisCo carboxylation rates (Vcmax), maximum RuBP regeneration rates (Jmax), and photosynthetic nitrogen-use efficiency (PNUEmax) relative to other seasons. Collectively, these results suggest thatA. mongolicusadapts physiologically to maximize carbon assimilation during spring and summer, and to maximize foliar resistance to cold stress at the expense of photosynthesis in winter. Foliage was protected against photo-oxidative damage during temperature extremes in winter by dark-sustained thermal energy dissipation. Overall, our study reveals that multiple photosynthetic adjustments, varying among the seasons, enable the survival of cold desert evergreens.
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影响因子：
3.7
作者：
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通讯作者：
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影响因子：
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作者：
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2
作者：
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通讯作者：
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通讯作者：
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影响因子：
2.3
作者：
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通讯作者：
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