FACTORS ASSOCIATED WITH DEPRESSION OF PHOTOSYNTHETIC QUANTUM EFFICIENCY IN MAIZE AT LOW GROWTH TEMPERATURE
FACTORS ASSOCIATED WITH DEPRESSION OF PHOTOSYNTHETIC QUANTUM EFFICIENCY IN MAIZE AT LOW GROWTH TEMPERATURE
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DOI：
10.1104/pp.108.2.761
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发表时间：
1995-06-01
期刊：
影响因子：
7.4
通讯作者：
BAKER, NR
中科院分区：
文献类型：
--
作者：
FRYER, MJ;OXBOROUGH, K;BAKER, NR
在温带地区，玉米的光合生产力常常受到低温的限制。通过测定CO2固定和光系统II（PSII）光化学的量子产率、叶黄素循环的色素、活性和非活性PSII反应中心的浓度以及PSII反应中心核心组分的合成，研究了玉米光合作用对次适温下生长的敏感性。在将这些植物转移到25 ℃之前和之后的前48小时期间，对在14 ℃下生长的完全展开的叶进行测量。我们的研究结果表明，玉米黄质相关的淬火吸收的激发能在PSII是，定量的，最重要的因素确定在14摄氏度生长的植物的光合效率低下。尽管玉米黄质相关的淬火吸收的激发能提供的光保护，一个显着的和更持久的抑制光合效率似乎是由于低温诱导的抑制率，在其中损坏的PSII中心可以被替换。
The photosynthetic productivity of maize (Zea mays) in temperate regions is often limited by low temperatures. The factors responsible for the sensitivity of photosynthesis in maize to growth at suboptimal temperature were investigated by measuring (a) the quantum yields of CO2 fixation and photosystem II (PSII) photochemistry, (b) the pigments of the xanthophyll cycle, (c) the concentrations of active and inactive PSII reaction centers, and (d) the synthesis of core components of PSII reaction centers. Measurements were made on fully expanded leaves grown at 14 degrees C, both before and during the first 48 h after transfer of these plants to 25 degrees C. Our findings indicate that zeaxanthin-related quenching of absorbed excitation energy at PSII is, quantitatively, the most important factor determining the depressed photosynthetic efficiency in 14 degrees C-grown plants. Despite the photoprotection afforded by zeaxanthin-related quenching of absorbed excitation energy, a significant and more persistent depression of photosynthetic efficiency appears to result from low temperature-induced inhibition of the rate at which damaged PSII centers can be replaced.