Photosynthesis impairments and excitation energy dissipation on wheat plants supplied with silicon and infected with Pyricularia oryzae
Photosynthesis impairments and excitation energy dissipation on wheat plants supplied with silicon and infected with Pyricularia oryzae
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DOI：
10.1016/j.plaphy.2017.10.023
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发表时间：
2017-12-01
影响因子：
6.5
通讯作者：
Rodrigues, Fabricio Avila
中科院分区：
文献类型：
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作者：
Aucique-Perez, Carlos Eduardo;de Menezes Silva, Paulo Eduardo;Rodrigues, Fabricio Avila
考虑到硅（Si）在降低受感染植物光合能力损失的情况下减轻小麦上的稻瘟病症状的效果，本研究调查了利用入射光的能力，叶绿体色素（叶绿素和类胡萝卜素）的变化和类胡萝卜素对小麦植株光耗散过程的可能作用接种或不接种梨孢霉。对于+ Si植物，与-Si植物相比，稻瘟病严重程度降低。减少光合色素（总叶绿素，紫黄质+花药黄质+玉米黄质，β-胡萝卜素和叶黄素）的浓度接种硅植物比接种+硅的。与未接种的植物相比，接种的-Si和+ Si植物的α-胡萝卜素浓度增加，因此限制叶黄素的产生。较高的功能损害的光系统II（PSII）被注意到接种硅植物的最大量子猝灭，PSII的光化学产率和电子传递速率的值的减少，但较高的值猝灭非光化学。这一发现也有助于减少的光饱和速率光合作用和光饱和点的值为-Si植物接种+ Si植物减弱。接种植株的暗呼吸值比未接种植株的暗呼吸值增加。小麦植株的硅供应，除了减少稻瘟病的严重程度，有助于他们更好的光合性能。此外，接种+ Si植物应对光能量耗散过程（荧光和热）的急剧损失，通过增加类胡萝卜素的浓度，这有助于保持光合机制的结构和功能的可行性，从而最大限度地减少脂质过氧化和活性氧的产生。
Considering the effect of silicon (Si) in reducing the blast symptoms on wheat in a scenario where the losses in the photosynthetic capacity of the infected plants is lowered, this study investigated the ability of using the incident light, the chloroplastidic pigments (chlorophylls and carotenoids) alterations and the possible role of carotenoids on the process of light dissipation on wheat plants non-supplied (-Si) or supplied (+Si) with Si and inoculated or not with Pyricularia oryzae. For + Si plants, blast severity was reduced compared to -Si plants. Reductions in the concentration of photosynthetic pigments (total chlorophyll, violanxanthin + antheraxanthin + zeaxanthin, beta-carotene and lutein) were greater for inoculated -Si plants than for inoculated + Si ones. The alpha-carotene concentration increased for inoculated -Si and + Si plants in comparison to non-inoculated plants limiting, therefore, lutein production. Higher functional damage to the photosystem II (PSII) was noticed for inoculated -Si plants with reductions in the values of maximum quantum quenching, photochemical yield of PSII and electron transport rate, but higher values for quenching non-photochemical. This finding also contributed to reductions in the values of light saturated rate photosynthesis and light saturation point for -Si plants which was attenuated for inoculated + Si plants. Increase in dark respiration values occurred for inoculated plants than for non-inoculated ones. The Si supply to wheat plants, besides reducing blast severity, contributed to their better photosynthetic performance. Moreover, inoculated + Si plants coped with drastic losses of light energy dissipation processes (fluorescence and heat) by increasing the concentration of carotenoids which helped to maintain the structural and functional viability of the photosynthetic machinery minimizing, therefore, lipid peroxidation and the production of reactive oxygen species.