Oh Dohyeok, Ryu Jae-Hyun, Oh Sehee, Jeong Hoejeong, Park Jisung, Jeong Rae-Dong, Kim Wonsik, Cho Jaeil
Department of Applied Plant Science, Chonnam National University, Gwangju 61186, Korea.
Department of Applied Biology, Institute of Environmentally Friendly Agriculture, Chonnam National University, Gwangju 61185, Korea.
Plant Pathol J. 2018 Jun;34(3):236-240. doi: 10.5423/PPJ.NT.11.2017.0247. Epub 2018 Jun 1.
Crop yield is critically related to the physiological responses and disease resistance of the crop, which could be strongly affected by high temperature conditions. We observed the changes in the growth of barley under higher than ambient air-temperature conditions using a temperature gradient field chamber (TGFC) during winter and spring. Before the stem extension stage of barley growth, sp. spontaneously appeared in the TGFC. The severity of disease became serious under warmer temperature conditions. Further, the stomata closed as the severity of the disease increased; however, stomatal conductance at the initial stage of disease was higher than that of the normal leaves. This was likely due to the Iwanov effect, which explains that stressed plants rapidly and transiently open their stomata before longer-term closure. In this study, we tested three optical methods: soil-plant analysis development (SPAD) chlorophyll index, photochemical reflectance index (PRI), and maximum quantum yield (Fv/Fm). These rapid evaluation methods have not been used in studies focusing on disease stress, although some studies have used these methods to monitor other stresses. These three indicative parameters revealed that diseased barley exhibited lower values of these parameters than normal, and with the increase in disease severity, these values declined further. Our results will be useful in efficient monitoring and evaluation of crop diseases under future warming conditions.
作物产量与作物的生理反应和抗病性密切相关，而高温条件会对其产生强烈影响。我们在冬季和春季使用温度梯度场室（TGFC）观察了高于环境气温条件下大麦的生长变化。在大麦生长的茎伸长阶段之前，TGFC中自发出现了病害。在温暖的温度条件下，病害的严重程度加剧。此外，随着病害严重程度的增加，气孔关闭；然而，病害初期的气孔导度高于正常叶片。这可能是由于伊万诺夫效应，该效应解释了受胁迫的植物在长期关闭之前会迅速且短暂地打开气孔。在本研究中，我们测试了三种光学方法：土壤-植物分析发展（SPAD）叶绿素指数、光化学反射指数（PRI）和最大量子产率（Fv/Fm）。尽管一些研究已使用这些方法来监测其他胁迫，但这些快速评估方法尚未用于聚焦病害胁迫的研究中。这三个指示参数表明，患病大麦的这些参数值低于正常大麦，并且随着病害严重程度的增加，这些值进一步下降。我们的结果将有助于在未来变暖条件下对作物病害进行高效监测和评估。
