Werle Rodrigo, Nunes Jose J, Arneson Nicholas J, Mobli Ahmadreza
Department of Plant and Agroecosystem Sciences, University of Wisconsin-Madison, 1575 Linden Drive, Madison, WI, 53706, USA.
BMC Plant Biol. 2024 Dec 21;24(1):1230. doi: 10.1186/s12870-024-05940-6.
The exogenous application of phytohormones to manipulate weed seed germination and emergence is a potential avenue for exploring alternative integrated weed management strategies. Greenhouse and field experiments were conducted to investigate the effects of exogenous applications of the phytohormones gibberellic acid (GA3) and abscisic acid (ABA) on waterhemp (Amaranthus tuberculatus [Moq.]) emergence.
In the greenhouse study, all waterhemp populations in sandy soil and three out of five populations in clay soil demonstrated a positive response to increased GA3; however, the response was small, leading to an increase in waterhemp emergence of up to 10% points, and weak (R < 0.3). Only one population exhibited a small (up to 10 points) and weak (R = 0.1) reduction in emergence in response to increased ABA in clay soil. The field studies demonstrated no differences in waterhemp and soybean emergence in response to application of GA3 and ABA.
Despite the low to absent efficacy of the exogenous application of GA3 and ABA in manipulating waterhemp emergence in these experiments, our findings provide foundation information for future research on this concept, particularly supporting further research investing the use of GA3 in lighter textured soils.
外源施用植物激素以控制杂草种子萌发和出土是探索替代性综合杂草管理策略的一个潜在途径。开展了温室和田间试验，以研究外源施用植物激素赤霉素（GA3）和脱落酸（ABA）对水麻（Amaranthus tuberculatus [Moq.]）出土的影响。
在温室研究中，沙质土壤中的所有水麻种群以及黏土土壤中五分之三种群对GA3增加均表现出阳性反应；然而，反应较小，导致水麻出土增加最多10个百分点，且相关性较弱（R < 0.3）。在黏土土壤中，只有一个种群对ABA增加表现出较小（最多10个百分点）且较弱（R = 0.1）的出土减少。田间研究表明，施用GA3和ABA后，水麻和大豆的出土没有差异。
尽管在这些试验中外源施用GA3和ABA在控制水麻出土方面效果不佳或无效，但我们的研究结果为该概念的未来研究提供了基础信息，特别是支持进一步研究在质地较轻的土壤中使用GA3。
