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Sorghum bicolor prioritizes the recovery of its photosynthetic activity when re-watered after severe drought stress, while manages to preserve it under elevated CO2 and drought
Journal of Agronomy and Crop Science ( IF 3.5 ) Pub Date : 2022-07-23 , DOI: 10.1111/jac.12618
Xabier Simón Martínez‐Goñi 1 , Anabel Robredo 1 , Usue Pérez‐López 1 , Alberto Muñoz‐Rueda 1 , Amaia Mena‐Petite 2
Affiliation  

Understanding plant response and resilience to drought under a high CO2 environment will be crucial to ensure crop production in the future. Sorghum bicolor is a C4 plant that resists drought better than other crops, which could make it a good alternative to be grown under future climatic conditions. Here, we analyse the physiological response of sorghum under 350 ppm CO2 (aCO2) or 700 ppm CO2 (eCO2) with drought (D) or without drought (WW) for 9, 13 and 16 days; as well as its resilience under long (R1: 9D + 7R) or short (R2: 13D + 3R) recovery treatments. Sorghum showed elevated rates of gs under aCO2 and WW, which resulted in a significant decrease in Ψw, gs, E, ΦPSII, Fv’/Fm when exposed to drought. Consequently, A was greatly decreased. When re-watered, both re-watering treatments prioritized A recovery by restoring photosynthetic machinery under aCO2, whereas under eCO2 plants required little recovery since plant were hardly affected by drought. However, sorghum growth rate for aboveground organs did not reach control values, indicating a slower long-term recovery. Overall, these results provide information about the resilience of sorghum and its utility as a suitable candidate for the drought episodes of the future.

中文翻译:

在严重干旱胁迫后重新浇水时,双色高粱会优先恢复其光合活性,同时设法在二氧化碳浓度升高和干旱条件下保存它

了解植物在高 CO 2环境下对干旱的反应和恢复能力对于确保未来的作物生产至关重要。双色高粱是一种 C 4植物,比其他作物更能抵抗干旱,这可能使其成为在未来气候条件下种植的良好替代品。在这里,我们分析了高粱在 350 ppm CO 2 (aCO 2 ) 或 700 ppm CO 2 (eCO 2 ) 条件下干旱 (D) 或无干旱 (WW) 9、13 和 16 天的生理反应;以及其在长期(R1:9D + 7R)或短期(R2:13D + 3R)恢复处理下的弹性。高粱在 aCO 2下表现出升高的gs和 WW,当暴露于干旱时,这会导致Ψ wgsEΦ PSIIF v '/F m '显着下降。因此,A大大减少。重新浇水时,两种重新浇水处理都优先通过在 aCO 2下恢复光合机制来恢复A,而在 eCO 2下植物几乎不需要恢复,因为植物几乎不受干旱影响。然而,高粱地上器官的生长速度没有达到对照值,表明长期恢复较慢。总的来说,这些结果提供了有关高粱的恢复力及其作为未来干旱事件合适候选者的效用的信息。
更新日期:2022-07-23
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