Differences in Water Consumption of Wheat Varieties Are Affected by Root Morphology Characteristics and Post-anthesis Root Senescence

Zheng, Xuejiao; Zhang, Yu; Yu, Shen; Peng, Liang

doi:10.3389/fpls.2021.814658

Cited by 4 publications

(4 citation statements)

References 51 publications

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“…Since there is a paucity of studies on RWU in alpine meadows, this paper is based on the study of root growth characteristics and water consumption capacity of maize and other ( Yu et al., 2015 ; Zheng et al., 2022 ) crops as an analogy to alpine meadows. The results showed that the water consumption of plants differed in different phenological stages, with the maximum water consumption in the early stage of plant growth and decreasing in the maturity stage.…”

Section: Discussionmentioning

confidence: 99%

Construction of root tip density function and root water uptake characteristics in alpine meadows

Deng

Weng²,

Yan³

et al. 2022

Front. Plant Sci.

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Accurate calculation of root water uptake (RWU) is the key to improving vegetation water use efficiency and identifying water cycle evolution patterns, and root tips play an important role in RWU. However, most of the current RWU models in the alpine meadow are calculated based on the root length density (RLD) function. In this study, a large number of roots, soil hydraulic conductivity, and physicochemical property indices were obtained by continuous field prototype observation experiments for up to 2 years. It was found that the RLD and root tip density (RTD) in alpine meadows decrease by 16.2% and 14.6%, respectively, in the wilting stage compared to the regreening stage. The RTD distribution function of the alpine meadow was constructed, and the RWU model was established accordingly. The results show that the RTD function is more accurate than the RLD function to reflect the RWU pattern. Compared with RLD, the simulated RWU model constructed by using RTD as the root index that can effectively absorb water increased by 24.64% on average, and the simulated values were more consistent with the actual situation. It can be seen that there is an underestimation of RWU calculated based on the RLD function, which leads to an underestimation of the effect of climate warming on evapotranspiration. The simulation results of the RWU model based on RTD showed that the RWU rate in the regreening stage increased by 30.24% on average compared with that in the wilting stage. Meanwhile, the top 67% of the rhizosphere was responsible for 86.76% of the total RWU on average. This study contributes to the understanding of the alpine meadow water cycle system and provides theoretical support for the implementation of alpine meadow vegetation protection and restoration projects.

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Section: Discussionmentioning

confidence: 99%

Construction of root tip density function and root water uptake characteristics in alpine meadows

Deng

Weng²,

Yan³

et al. 2022

Front. Plant Sci.

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“…The analysis of the mechanism influencing RWU can be focused on the influencing factors that determine RWU capacity. Most studies have focused on root factors when exploring the influencing factors (Zheng et al, 2022), however, we believe that roots and soil are inseparable. Thus, the study of two key factors, RLD, and soil hydraulic conductivity, will improve the understanding of the mechanism that impacts RWU.…”

Section: Figurementioning

confidence: 99%

“…On the time scale, the RLD in alpine meadows was significantly greater in the re-greening stage than in the wilting stage, and the RLD in the wilting stage decreased by 16.2% on average compared to the re-greening stage. This phenomenon is related to the plant growth process, and there are some differences in the water consumption of plants in different phenological stages, with higher water consumption in the early stage of plant growth and a gradual decrease in the later stage of growth (Yu et al, 2015;Zheng et al, 2022). Roots are important organs for plant water uptake, and when plants consume more water, the corresponding root index tends to be larger.…”

Section: Characteristics and Distribution Functions Of Rld Distributi...mentioning

confidence: 99%

“…Water is a key factor for plant growth, and the root is an important organ for plant water use. Differences in the morphological characteristics of root distribution will directly affect the ability of water consumed by plants (Zheng et al, 2022), and studies have shown that limited water availability is a major factor in alpine meadow degradation (Cai et al, 2015). Therefore, investigating the efficiency of water use by roots and the key factors affecting water use can help alpine meadow ecosystem restoration projects to be carried out reasonably and efficiently.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of the applicability of the root water uptake model on alpine meadows and analysis of root water uptake characteristics

Deng

Weng²,

Yan³

et al. 2022

Front. Earth Sci.

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It is essential to quantify the rate of root water uptake (RWU) and characterize the variability of RWU, which benefits understanding the water use of alpine meadows and its response to environmental changes. In addition, model simulation is one of the feasible methods to obtain the RWU characteristics of alpine meadows. However, recent research on RWU models mainly focused on crops and trees, while barely on alpine meadows. Thus, it is of great significance to develop an RWU model applicable to alpine meadows, which can describe local plant water consumption processes. In this paper, we measured the distribution characteristics of root density and soil characteristics of alpine meadows in the Qinghai-Tibet Plateau (QTP) with prototype observation experiments. The root length density (RLD) of the wilting stage decreased by 16.2% on average compared to the re-greening stage, and the ability of root growth was poorer in the high altitude area. Based on the distribution characteristics of root length density (RLD) and the three soil resistance indexes (soil water potential, soil hydraulic diffusivity, and soil hydraulic conductivity), which have obvious impacts on RWU. The improved Feddes model, Selim-Iskandar model, and Molz-Remson model were selected to simulate the RWU in alpine meadows, which fully considered the above impact factors, but the applicability in alpine meadows was not discussed. The results showed that the model performance of the Selim-Iskandar model was better than the improved Feddes model and Molz-Remson model, and its simulation performance was improved by 44.76 and 22.16% compared to the improved Feddes model and Molz-Remson model, respectively. Based on the quantified RWU rate, the RWU characteristics showed that the top 50% of the rhizosphere was responsible for 72.65% of the water uptake of the entire rhizosphere. At the same time, the obvious difference in RWU rate in different phenological stages was obvious, showing that the RWU rate in the re-greening stage increased by 36.52% compared to that in the wilting stage. This study can provide technical support for a more accurate estimation of transpiration and water use efficiency in alpine meadows, and could provide theoretical support for the implementation of vegetation.

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Winter wheat yield improvement by genetic gain across different provinces in China

Chen,

Zhang,

Deng

2024

Journal of Integrative Agriculture

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Differences in Water Consumption of Wheat Varieties Are Affected by Root Morphology Characteristics and Post-anthesis Root Senescence

Cited by 4 publications

References 51 publications

Construction of root tip density function and root water uptake characteristics in alpine meadows

Construction of root tip density function and root water uptake characteristics in alpine meadows

Evaluation of the applicability of the root water uptake model on alpine meadows and analysis of root water uptake characteristics

Winter wheat yield improvement by genetic gain across different provinces in China

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