Deep Roots are Pivotal for Regulating Post‐Anthesis Leaf Senescence in Wheat (<i>Triticum aestivum</i> L.)

Kong, Lingan; Si, Jisheng; Sun, Mengzhe; Feng, Bo; Zhang, B.; Li, S.; Wang, Z.; Wang, F.

doi:10.1111/jac.12007

Cited by 18 publications

(12 citation statements)

References 26 publications

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“…Assays of the antioxidant enzyme activities were measured as described by Kong et al (2013b , c ). The flag leaves and glumes were harvested at 0, 8, 16, 24, and 32 DAA, immediately frozen in liquid N 2 , and then stored at –80°C until experimental analysis.…”

Section: Methodsmentioning

confidence: 99%

Photochemical and antioxidative responses of the glume and flag leaf to seasonal senescence in wheat

et al. 2015

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The non-leaf photosynthetic organs have recently attracted much attention for the breeding and screening of varieties of cereal crops to achieve a high grain yield. However, the glume photosynthetic characteristics and responses to high temperature at the late stages of grain filling are not well known in winter wheat (Triticum aestivum L.). In the present study, an experiment was conducted to investigate the anatomy, chloroplast temporal changes, chlorophyll fluorescence, xanthophyll cycle and antioxidative defense system in glumes of field-grown wheat during grain filling compared with flag leaves. Observations using a light microscope revealed that the glumes developed a solid structural base for performing photosynthesis. Compared with the flag leaves, the glumes preserved a more integral ultrastructure, as observed under transmission electron microscopy, and had higher values of Fv/Fm and ΦPSII at the maturity stage. Further analysis of the chlorophyll fluorescence demonstrated that the glumes experienced high non-photochemical quenching (NPQ) at the late stages. Determination of the pool size of the xanthophyll cycle suggested that the (A+Z)/(V+A+Z) ratio was consistently higher in glumes than in flag leaves and that the V+A+Z content was considerably higher in glumes at the maturity stage. In addition, the glumes exhibited a higher antioxidant enzyme activity and a lower accumulation of reactive oxygen species. These results suggest that the glumes are photosynthetically active and senesce later than the flag leaves; the advantages may have been achieved by coordinated contributions of the structural features, higher NPQ levels, greater de-epoxidation of the xanthophyll cycle components and antioxidative defense metabolism.

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Section: Methodsmentioning

confidence: 99%

Photochemical and antioxidative responses of the glume and flag leaf to seasonal senescence in wheat

et al. 2015

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“…Here, the average root depths for sites were used for the calculations, with the intent to reproduce the conditions of limited input data access on farms. For the calculation of maximum (potential) water depletion from layers of the crop root zone, an empirical approach was used, based on literature data (e.g., Kong et al, 2013), previous studies (Haberle and Svoboda, 2012;Svoboda and Haberle, 2014a), and field observations of apparent depletion of soil water. Before long, depletion of water is shifted to deeper sparsely rooted subsoil layers when the upper zones are exhausted.…”

Section: B Crop Root Depth and Depletion Of Water From The Root Zonementioning

confidence: 99%

“…It is evident that the approach for a solution must be complex. An optimal root system and the utilization of the water reserve from the root zone are recognized as important factors in the effort (Himmelbauer et al, 2008;Kirkegaard et al, 2007;Kong et al, 2013;. Further, deep roots absorb nitrate and other nutrients leached from top soil, an important function in the effort for reduction of water pollution (e.g.…”

Section: Introductionmentioning

confidence: 99%

Calculation of available water supply in crop root zone and the water balance of crops

Haberle

Svoboda

2015

Contributions to Geophysics and Geodesy

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Determination of the water supply available in soils for crops is important for both the calculation of water balance and the prediction of water stress. An approach to calculations of available water content in layers of the root zone, depletion of water during growth, and water balance, with limited access to data on farms, is presented. Soil water retention was calculated with simple pedotransfer functions from the texture of soil layers, root depth, and depletion function were derived from observed data; and the potential evapotranspiration was calculated from the temperature. A comparison of the calculated and experimental soil water contents showed a reasonable fit.

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“…It is a process in which plant tissues or organs move toward functional decline or death. If the crop senescence is rapid, the physiological and biochemical metabolisms of the entire plant change, photosynthesis is seriously reduced, assimilates are insufficient, and grain filling is affected (Kong et al, 2013). Studies have found that early senescence can reduce the plumpness of rice and wheat grain, thereby resulting in a yield loss of more than 20% (Zhang et al, 1998).…”

Section: Introductionmentioning

confidence: 99%

Effects of tillage methods on senescence and grain filling characteristics of Tartary buckwheat

Zhang

et al. 2020

Zemdirbyste-Agriculture

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A field experiment was conducted on a yellow loam in 2017 and 2018. The study used a Tartary buckwheat (Fagopyrum tataricum L.) cultivar 'Jinqiao 2' to determine the effects of no-tillage, conventional tillage and deep tillage on the senescence and grain filling characteristics. The tillage methods were investigated based on the changes in buckwheat grain filling dynamics, root morphology and physiology, photosynthetic pigment content, antioxidant enzyme activity, malondialdehyde (MDA) content and yield formation. The initial growth power, maximum grain filling rate, the values of root morphological characteristics, root activity, photosynthetic pigment contents and antioxidant enzyme activities were the highest under deep tillage. The MDA content was the highest under no-tillage. The agronomic characters and yield formation indexes of Tartary buckwheat were better under deep tillage. The results of this study showed that deep tillage promoted the grain filling of Tartary buckwheat, delayed the senescence and increased the final yield.

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Deep Roots are Pivotal for Regulating Post‐Anthesis Leaf Senescence in Wheat (Triticum aestivum L.)

Cited by 18 publications

References 26 publications

Photochemical and antioxidative responses of the glume and flag leaf to seasonal senescence in wheat

Photochemical and antioxidative responses of the glume and flag leaf to seasonal senescence in wheat

Calculation of available water supply in crop root zone and the water balance of crops

Effects of tillage methods on senescence and grain filling characteristics of Tartary buckwheat

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