Light and growth temperature alter carbon isotope discrimination and estimated bundle sheath leakiness in C4 grasses and dicots
Light and growth temperature alter carbon isotope discrimination and estimated bundle sheath leakiness in C4 grasses and dicots
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DOI：
10.1007/s11120-007-9136-6
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发表时间：
2007-01-01
影响因子：
3.7
通讯作者：
Santrucek, Jiri
中科院分区：
文献类型：
--
作者：
Kubasek, Jiri;Setlik, Jiri;Santrucek, Jiri
我们结合了短期（气体交换过程中）和长期（来自植物干物质）碳同位素辨别的测量，以估计六种 C-4 物种（三种草和三种双子叶植物）束鞘细胞的 CO2 泄漏量，作为叶片插入水平、生长温度和短期辐照度的函数。对于除狗尾草之外的所有物种，两种确定泄漏性的方法都得出相似的结果（P > 0.05），这可能是由于该物种的叶子不适合气体交换。叶子插入水平对泄漏没有影响。在最高生长温度（36℃）下，渗漏性低于在两个较低生长温度（16℃和26℃）下的渗漏性，而这两个温度下的渗漏性没有明显差异。较高的辐照度降低了三个物种的泄漏性，而对其他物种没有显着影响（两个物种的趋势相反）。对增加辐照度的逆反应在两种 NAD-ME 双子叶植物（均为苋属植物）中最为明显，它们在低光（300 μ mol 量子 m(-2) s(-1)）下均表现出近 50% 的泄漏，而在高光（1,600 μ mol 量子 m(-2) s(-1)）下约为 30% 的泄漏。 NADP-ME 亚型草的渗漏性低于 NAD-ME 双子叶植物。尽管也有例外，特别是辐照度对高粱和布尔哈维亚漏水的影响，但我们得出结论，有利于 C-4 光合作用的条件（高温和强光）会导致漏水减少。
We combined measurements of short-term (during gas exchange) and long-term (from plant dry matter) carbon isotope discrimination to estimate CO2 leakiness from bundle sheath cells in six C-4 species (three grasses and three dicots) as a function of leaf insertion level, growth temperature and short-term irradiance. The two methods for determining leakiness yielded similar results (P > 0.05) for all species except Setaria macrostachya, which may be explained by the leaf of this species not being accommodating to gas exchange. Leaf insertion level had no effect on leakiness. At the highest growth temperature (36 degrees C) leakiness was lower than at the two lower growth temperatures (16 degrees C and 26 degrees C), between which no differences in leakiness were apparent. Higher irradiance decreased leakiness in three species, while it had no significant effect on the others (there was an opposite trend in two species). The inverse response to increasing irradiance was most marked in the two NAD-ME dicots (both Amaranthus species), which both showed almost 50% leakiness at low light (300 mu mol quanta m(-2) s(-1)) compared to about 30% at high light (1,600 mu mol quanta m(-2) s(-1)). NADP-ME subtype grasses had lower leakiness than NAD-ME dicots. Although there were exceptions, particularly in the effect of irradiance on leakiness in Sorghum and Boerhavia, we conclude that conditions favourable to C-4 photosynthesis (high temperature and high light) lead to a reduction in leakiness.