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首页> 美国卫生研究院文献>Journal of Experimental Botany >Shade compromises the photosynthetic efficiency of NADP-ME less than that of PEP-CK and NAD-ME C4 grasses
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Shade compromises the photosynthetic efficiency of NADP-ME less than that of PEP-CK and NAD-ME C4 grasses

机译：遮光对NADP-ME光合效率的危害要小于PEP-CK和NAD-ME C4草的光合效率

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The high energy cost and apparently low plasticity of C4 photosynthesis compared with C3 photosynthesis may limit the productivity and distribution of C4 plants in low light (LL) environments. C4 photosynthesis evolved numerous times, but it remains unclear how different biochemical subtypes perform under LL. We grew eight C4 grasses belonging to three biochemical subtypes [NADP-malic enzyme (NADP-ME), NAD-malic enzyme (NAD-ME), and phosphoenolpyruvate carboxykinase (PEP-CK)] under shade (16% sunlight) or control (full sunlight) conditions and measured their photosynthetic characteristics at both low and high light. We show for the first time that LL (during measurement or growth) compromised the CO2-concentrating mechanism (CCM) to a greater extent in NAD-ME than in PEP-CK or NADP-ME C4 grasses by virtue of a greater increase in carbon isotope discrimination (∆P) and bundle sheath CO2 leakiness (ϕ), and a greater reduction in photosynthetic quantum yield (Φmax). These responses were partly explained by changes in the ratios of phosphoenolpyruvate carboxylase (PEPC)/initial Rubisco activity and dark respiration/photosynthesis (Rd/A). Shade induced a greater photosynthetic acclimation in NAD-ME than in NADP-ME and PEP-CK species due to a greater Rubisco deactivation. Shade also reduced plant dry mass to a greater extent in NAD-ME and PEP-CK relative to NADP-ME grasses. In conclusion, LL compromised the co-ordination of the C4 and C3 cycles and, hence, the efficiency of the CCM to a greater extent in NAD-ME than in PEP-CK species, while CCM efficiency was less impacted by LL in NADP-ME species. Consequently, NADP-ME species are more efficient at LL, which could explain their agronomic and ecological dominance relative to other C4 grasses.
机译：与C3光合作用相比，C4光合作用的高能源成本和明显较低的可塑性可能会限制低光照（LL）环境中C4植物的生产力和分布。 C4光合作用进化了许多次，但尚不清楚在LL下不同的生化亚型如何表现。我们在遮荫（16％阳光）或对照下种植了8种C4草，它们属于三种生化亚型[NADP-苹果酸酶（NADP-ME），NAD-苹果酸酶（NAD-ME）和磷酸烯醇丙酮酸羧激酶（PEP-CK）]。阳光下），并在弱光和强光下测量其光合特性。我们首次表明，由于碳的增加幅度更大，在NAD-ME中，LL（在测量或生长过程中）对CO2浓缩机制（CCM）的危害要大于PEP-CK或NADP-ME C4草。同位素分辨（∆P）和束鞘CO2泄漏（ϕ），以及光合量子产率（Φmax）的更大降低。这些反应部分由磷酸烯醇丙酮酸羧化酶（PEPC）/初始Rubisco活性和暗呼吸/光合作用（Rd / A）之比的变化来解释。阴影引起的NAD-ME的光合适应能力强于NADP-ME和PEP-CK，这是由于Rubisco失活能力更大。与NADP-ME草相比，NAD-ME和PEP-CK遮荫还可以更大程度地减少植物的干重。总之，LL损害了C4和C3循环的协调性，因此，NAD-ME中CCM的效率要比PEP-CK物种更大，而CCM效率受NADP-LL中LL的影响较小。 ME物种。因此，NADP-ME物种在LL时效率更高，这可以解释其相对于其他C4草的农艺和生态优势。

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