Growth condition controls on G-93 parameters of isoprene emission from tropical trees
Growth condition controls on G-93 parameters of isoprene emission from tropical trees
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DOI：
10.1007/s10265-021-01344-x
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发表时间：
2021-09
影响因子：
2.8
通讯作者：
H. Oku;Shohei Iwai;Misaki Uehara;A. Iqbal;I. Mutanda;M. Inafuku
中科院分区：
文献类型：
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作者：
H. Oku;Shohei Iwai;Misaki Uehara;A. Iqbal;I. Mutanda;M. Inafuku
尽管热带树木在全球异戊二烯排放中起着重要作用，但关于热带树木异戊二烯排放的环境控制的资料仍然很少。因此，在本研究中，我们研究了G-93异戊二烯释放公式（CT1、CT2和α）参数、生长温度和光照强度、光合作用（h, Pmax）、异戊二烯合成酶（IspS）水平和2- c -甲基-d-erythritol 4-磷酸（MEP）途径代谢产物之间的关系。结果表明，遮荫叶片异戊二烯释放量的温度依赖性与光照叶片差异不显著。相比之下，遮荫叶片的饱和辐照度低于阳光照射的叶片，与温带植物相同。遮荫叶片的光合速率表现出较低的饱和辐照度，与异戊二烯辐射的光依赖性相似。在大多数情况下，遮荫叶片的MEP途径代谢物浓度较光照叶片低，而遮荫叶片和遮荫叶片的IspS水平无显著差异。相关分析发现，G-93参数的ct1与DXP和DMADP浓度呈正相关，ct2与MEP浓度和过去48 h的平均气温呈正相关。α与光合速率初始斜率(h)密切相关，基础发射因子也与过去数天的光子通量密切相关。这些结果表明，生长条件可能通过改变MEP途径代谢物的分布来控制热带树木异戊二烯排放的温度依赖性，从而导致异戊二烯排放公式参数的改变。
Despite its major role in global isoprene emission, information on the environmental control of isoprene emission from tropical trees has remained scarce. Thus, in this study, we examined the relationship between parameters of G-93 isoprene emission formula (CT1,CT2, and α), growth temperature and light intensity, photosynthesis (ɸ, Pmax), isoprene synthase (IspS) level, and 2-C-methyl-d-erythritol 4-phosphate (MEP) pathway metabolites using sunlit and shaded leaves of four tropical trees. The results showed that the temperature dependence of isoprene emission from shaded leaves did not differ significantly from sunlit leaves. In contrast, there was a lower saturation irradiance in shaded leaves than in sunlit leaves, the same as temperate plants. The photosynthesis rate of shaded leaves showed lower saturation irradiance, similar to the light dependence of isoprene emission. In most cases, the concentration of MEP pathway metabolites was of lower tendency in shaded leaves versus in sunlit leaves, whereas no significant difference was noted in IspS level between sunlit and shaded leaves. Correlation analysis between these parameters found thatCT1of the G-93 parameter was positively correlated with the concentration of DXP and DMADP, whereasCT2correlated with the concentration of MEP and the average air temperature for the past 48 h. Similarly,αclosely associated with the initial slope (ɸ) of photosynthesis rate, and the basal emission factor is also linked to the photon flux of past days. These results suggest that growth conditions may control the temperature dependence of isoprene emission from tropical trees via the changes in the profiles of MEP pathway metabolites, causing alteration in the parameters of the isoprene emission formula.