Malan C, Berner J M
North-West University, Unit for Environmental Sciences and Management, Potchefstroom, South Africa.
Photosynthetica. 2022 May 27;60(3):362-371. doi: 10.32615/ps.2022.022. eCollection 2022.
Quinoa has been identified as a climate-resilient crop that can overcome unfavorable conditions. This study explores the photochemical efficiency of quinoa compared to maize subjected to drought stress. The JIP-test was used to assess the photochemical efficiency of both crops. Proline content, leaf water potential, and membrane leakage were also determined. The maximum photochemical efficiency (F/F) did not change for quinoa and maize under moderate stress. However, severe drought conditions resulted in a decline in F/F in maize but not quinoa. Furthermore, the PSII performance index (PI) declined steadily in maize soon after the onset of drought stress. The decline in the PI values for quinoa was only observed after a period of severe drought stress. Membrane leakage was also more prevalent in the maize plants, while quinoa had higher proline contents. This study concluded that both quinoa and maize maintained PSII structure and function under moderate drought conditions. However, only quinoa maintained PSII structure and function under severe drought conditions.
藜麦已被认定为一种能够抵御不利条件的抗气候作物。本研究探讨了与遭受干旱胁迫的玉米相比，藜麦的光化学效率。采用JIP测试来评估两种作物的光化学效率。还测定了脯氨酸含量、叶片水势和膜透性。在中度胁迫下，藜麦和玉米的最大光化学效率（F/F）没有变化。然而，严重干旱条件导致玉米的F/F下降，但藜麦没有。此外，干旱胁迫开始后不久，玉米的PSII性能指数（PI）稳步下降。藜麦的PI值仅在经历一段严重干旱胁迫后才出现下降。膜透性在玉米植株中也更为普遍，而藜麦的脯氨酸含量更高。本研究得出结论，在中度干旱条件下，藜麦和玉米均能维持PSII的结构和功能。然而，只有藜麦在严重干旱条件下能维持PSII的结构和功能。
