高温下快速的新陈代谢会增加普通豚草（Amaranthus tuberculatus）对 2,4-D 的抗性水平。
Rapid metabolism increases the level of 2,4-D resistance at high temperature in common waterhemp (Amaranthus tuberculatus).
机构信息
Department of Agronomy, Kansas State University, 2004 Throckmorton Plant Sciences Center, 1712 Claflin Road, Manhattan, KS, 66506, USA.
Department of Agronomy and Horticulture, University of Nebraska-Lincoln, 202 Keim Hall, Lincoln, NE, 68583, USA.
出版信息
Sci Rep. 2019 Nov 13;9(1):16695. doi: 10.1038/s41598-019-53164-8.
Common waterhemp emerges throughout the crop growing season in the Midwestern United States, and as a result, the seedlings are exposed to a wide range of temperature regimes. Typically, 2,4-D is used in the Midwest to control winter annual broad-leaf weeds before planting soybean and in an early post-emergence application in corn and sorghum; however, the evolution of 2,4-D-resistant common waterhemp in several Midwestern states may limit the use of 2.4-D for controlling this problem weed. Moreover, temperature is one of the crucial factors affecting weed control efficacy of 2,4-D. This research investigated the effect of temperature on efficacy of 2,4-D to control 2,4-D susceptible (WHS) and -resistant (WHR) common waterhemp. Do se-response of WHS and WHR to 2,4-D was assessed at two temperature regimes, high (HT; 34/20 °C, d/n) and low (LT; 24/10 °C, d/n). Whole plant dose response study indicated an increased level of 2,4-D resistance in WHR at HT compared to LT. Additional investigation of the physiological mechanism of this response indicated that both WHS and WHR common waterhemp plants rapidly metabolized C 2,4-D at HT compared to LT. In conclusion, a rapid metabolism of 2,4-D conferred increased level of resistance to 2,4-D in WHR at HT. Therefore, application of 2,4-D when temperatures are cooler can improve control of 2,4-D resistant common waterhemp.
在美国中西部地区，普通豚草在整个作物生长季节都会出现，因此，幼苗会暴露在广泛的温度环境中。通常，2,4-D 在美国中西部地区用于在种植大豆前控制冬季一年生阔叶杂草，以及在玉米和高粱的早期出苗后应用；然而，几种中西部州的 2,4-D 抗性普通豚草的进化可能限制了 2.4-D 用于控制这种问题杂草的使用。此外，温度是影响 2,4-D 除草效果的关键因素之一。本研究调查了温度对 2,4-D 控制 2,4-D 敏感（WHS）和抗性（WHR）普通豚草的效果的影响。在两种温度条件下，高（HT；34/20°C，d/n）和低（LT；24/10°C，d/n），评估了 WHS 和 WHR 对 2,4-D 的剂量反应。全株剂量反应研究表明，与 LT 相比，HT 下 WHR 对 2,4-D 的抗性水平更高。对这种反应的生理机制的进一步研究表明，与 LT 相比，HT 下 WHS 和 WHR 普通豚草植物迅速代谢 C 2,4-D。总之，HT 下 2,4-D 的快速代谢赋予了 WHR 对 2,4-D 更高的抗性水平。因此，在温度较低时应用 2,4-D 可以提高对 2,4-D 抗性普通豚草的控制效果。
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