Higher apical meristem in tall fescue as adaptation strategy to recurring short-term inundation

IF 1.3 Q3 AGRONOMY
Marina Miquilini, Ricardo Henrique Ribeiro, Spencer Bauman, Steve W. Lyon, Marília B. Chiavegato
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Abstract

Soil inundation frequency and intensity in the central United States are predicted to increase because of climate change. Soil inundation is expected to negatively affect plant growth and persistency. Our objective was to measure tiller and apical meristem height, leaf area index (LAI), and leaf-to-stem ratio effects on tall fescue (Schedonorus arundinaceus (Schreb.)) under different levels of soil inundation intensity. The study was conducted on a commercial farm in northwestern Ohio, from spring to fall 2021. Three different levels of inundation were observed and assigned as treatments: no inundation, low inundation (LI), and high inundation (HI). LI and HI were defined by the duration on which the soil was inundated after heavy rain events: 1–2 and 3–5 days after rain, respectively. Meristem and tiller height were higher during spring (p < 0.001), and lower in late summer across treatments (p < 0.001). The higher LAI and leaf-to-stem ratio occurred in spring, probably due to higher leaf mass (p < 0.001). As seasons progressed, plant and meristem height, LAI, and leaf mass decreased (p < 0.001). Despite not being considered an inundation-tolerant species, tall fescue showed morphological adaptation to the inundation levels of our study, suggesting that this species can be used to manage fields prone to short-term inundation.

Abstract Image

高羊茅的较高顶端分生组织是对反复出现的短期淹没的适应策略
据预测,美国中部的土壤淹没频率和强度将因气候变化而增加。预计土壤淹没将对植物生长和持久性产生负面影响。我们的目的是测量在不同程度的土壤淹没强度下,高羊茅(Schedonorus arundinaceus (Schreb.))的分蘖和顶端分生组织高度、叶面积指数(LAI)以及叶茎比的影响。该研究于 2021 年春季至秋季在俄亥俄州西北部的一个商业农场进行。观察了三种不同程度的淹没,并将其作为处理:无淹没、低淹没(LI)和高淹没(HI)。低淹没和高淹没是根据暴雨后土壤被淹没的持续时间来定义的:分别为雨后 1-2 天和 3-5 天。各处理的分生组织和分蘖高度在春季较高(p <0.001),在夏末较低(p <0.001)。春季的 LAI 和叶茎比较高,可能是由于叶片质量较高(p < 0.001)。随着季节的变化,植株和分生组织高度、叶片成熟度和叶片质量都有所下降(p <0.001)。尽管高羊茅不被认为是耐淹水物种,但在我们的研究中,它表现出了对淹水程度的形态适应,这表明该物种可用于管理易受短期淹水影响的田地。
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来源期刊
Agrosystems, Geosciences & Environment
Agrosystems, Geosciences & Environment Agricultural and Biological Sciences-Agricultural and Biological Sciences (miscellaneous)
CiteScore
2.60
自引率
0.00%
发文量
80
审稿时长
24 weeks
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