Cold-tolerant crop species have greater temperature homeostasis of leaf respiration and photosynthesis than cold-sensitive species.
Cold-tolerant crop species have greater temperature homeostasis of leaf respiration and photosynthesis than cold-sensitive species.
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DOI：
10.1093/pcp/pcn189
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发表时间：
2009-02
影响因子：
4.9
通讯作者：
W. Yamori;K. Noguchi;K. Hikosaka;I. Terashima
中科院分区：
文献类型：
--
作者：
W. Yamori;K. Noguchi;K. Hikosaka;I. Terashima
一些植物物种在其各自的生长温度下表现出恒定的呼吸和光合作用速率（温度稳态），而另一些则不然。然而，目前还不清楚什么物种表现出这种温度稳态，以及什么因素影响温度稳态。为了分析植物对不同生长温度的呼吸和光合作用的内在适应能力，对11种不同耐寒性的草本植物进行了研究。在15和30摄氏度下，在360 μ l（-1）CO（2）浓度的强光下，测量了植物的叶呼吸（R（面积））和光合速率（P（面积））。耐寒树种的R（面积）和P（面积）的温度动态平衡程度均大于冷敏感树种。研究了引起温度稳态程度差异的潜在机制。P（面积）的温度动态平衡的程度不是由叶质量和每叶面积氮含量的差异，但在光合氮利用效率（PNUE）的差异。此外，PNUE的差异是由于Rubisco的最大催化速率，Rubisco含量和氮投入量的差异。这些结果表明，光合作用的温度稳态是由各种参数调节的。另一方面，R（面积）的温度稳态的程度是无关的呼吸酶（NAD-苹果酸酶）的最大活性。的R（面积）/P（面积）的比例保持在所有物种的生长温度无关，这表明温度的R（面积）与光合速率和/或光合作用的动态平衡的程度相互作用的动态平衡。
Some plant species show constant rates of respiration and photosynthesis measured at their respective growth temperatures (temperature homeostasis), whereas others do not. However, it is unclear what species show such temperature homeostasis and what factors affect the temperature homeostasis. To analyze the inherent ability of plants to acclimate respiration and photosynthesis to different growth temperatures, we examined 11 herbace-ous crops with different cold tolerance. Leaf respiration (R(area)) and photosynthetic rate (P(area)) under high light at 360 microl l(-1) CO(2) concentrations were measured in plants grown at 15 and 30 degrees C. Cold-tolerant species showed a greater extent of temperature homeostasis of both R(area) and P(area) than cold-sensitive species. The underlying mechanisms which caused differences in the extent of temperature homeostasis were examined. The extent of temperature homeostasis of P(area) was not determined by differences in leaf mass and nitrogen content per leaf area, but by differences in photosynthetic nitrogen use efficiency (PNUE). Moreover, differences in PNUE were due to differences in the maximum catalytic rate of Rubisco, Rubisco contents and amounts of nitrogen invested in Rubisco. These findings indicated that the temperature homeostasis of photosynthesis was regulated by various parameters. On the other hand, the extent of temperature homeostasis of R(area) was unrelated to the maximum activity of the respiratory enzyme (NAD-malic enzyme). The R(area)/P(area) ratio was maintained irrespective of the growth temperatures in all the species, suggesting that the extent of temperature homeostasis of R(area) interacted with the photosynthetic rate and/or the homeostasis of photosynthesis.