Source–Sink Adjustment: A Mechanistic Understanding of the Timing and Severity of Drought Stress on Photosynthesis and Grain Yields of Two Contrasting Oat (Avena sativa L.) Genotypes

Zhao, Baoping; Ma, Bao–Luo; Hu, Yuegao; Liu, Jinghui

doi:10.1007/s00344-020-10093-5

Cited by 37 publications

(40 citation statements)

References 58 publications

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“…This shows that both oat cultivars tend to redistribute assimilates to produce higher grain yields in stressful conditions. This finding agrees with Zao et al [56], who found a similar phenomenon in oats cv. Bia.…”

Section: Discussionsupporting

confidence: 94%

The Performance of Oat-Vetch Mixtures in Organic and Conventional Farming Systems

Pużyńska

Synowiec

Pużyński³

et al. 2021

Agriculture

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The research aimed to compare the yields and yield components of mixtures of oats with common vetch grown for seeds in organic and conventional farming systems. Moreover, the selection of oat cultivars for the mixture and its performance in a crop rotation experiment in different growing years was analyzed. Additionally, the leaf area index (LAI) and the relative content of chlorophyll (SPAD) of the mixtures were assessed. The field experiment with four-field crop rotation in organic or conventional farming systems was carried out in 2012–2014 in southern Poland. Common vetch (Vicia sativa L., cv. ‘Hanka’) was mixed with one of two oat (Avena sativa L.) cultivars, ‘Celer’ or ‘Grajcar.’ The effects of all of the factors on the mixtures’ canopy indices and yield were found. The canonical analysis revealed that the weather course, especially drought, had the largest effect on the oat-vetch mixtures’ performance. Moreover, the mixtures developed the highest LAI (5.28 m2∙m−2) and seed yield (4.57 t ha−1) in the conventional farming system. On the contrary, the share of vetch seeds in the mixtures was 24% higher in the organic system than in the conventional one. The selection of cv. ‘Grajcar’ oats for the mixture with vetch increased the share of vetch seeds in the yield by 16.5%. In summary, a balanced share of oat-vetch mixture components depends on the proper selection of the oat cultivar, especially for organic farming systems.

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Section: Discussionsupporting

confidence: 94%

The Performance of Oat-Vetch Mixtures in Organic and Conventional Farming Systems

Pużyńska

Synowiec

Pużyński³

et al. 2021

Agriculture

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“…The migration of metabolites in plants has nothing to do with the biomass of tissues and organs and is considered source-sink relationship regulation [50]. Source-sink models have been gradually applied to control plant resources under stress [13,51]. In this study, mechanical damage destroys the sourcesink balance.…”

Section: Discussionmentioning

confidence: 99%

“…Source-sink models have explained the relationship between plant demand changes and energy allocation, which involves complex metabolic and signaling networks [11][12][13]. Plants often reconfigure their nutritional resources and secondary metabolites in response to environmental stresses [10,14].…”

Section: Introductionmentioning

confidence: 99%

A source-sink model explains the difference in the metabolic mechanism of mechanical damage to young and senescing leaves in Catharanthus roseus

Chen

Guo

et al. 2021

BMC Plant Biol

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Background Mechanical damage is an unavoidable threat to the growth and survival of plants. Although a wound to senescing (lower) leaves improves plant vitality, a wound to younger (upper) leaves often causes damage to or death of the whole plant. Source-sink models are often used to explain how plants respond to biotic or abiotic stresses. In this study, a source-sink model was used to explain the difference in the metabolic mechanism of mechanical damage to young and senescing leaves of Catharanthus roseus. Results In our study, GC-MS and LC-QTOF-MS metabolomics techniques were used to explore the differences in source-sink allocation and metabolic regulation in different organs of Catharanthus roseus after mechanical damage to the upper/lower leaves (WUL/WLL). Compared with that of the control group, the energy supplies of the WUL and WLL groups were increased and delivered to the secondary metabolic pathway through the TCA cycle. The two treatment groups adopted different secondary metabolic response strategies. The WLL group increased the input to the defense response after damage by increasing the accumulation of phenolics. A source-sink model was applied to the defensive responses to local (damaged leaves) and systemic (whole plant) damage. In the WUL group, the number of sinks increased due to damage to young leaves, and the tolerance response was emphasized. Conclusion The accumulation of primary and secondary metabolites was significantly different between the two mechanical damage treatments. Catharanthus roseus uses different trade-offs between tolerance (repair) and defense to respond to mechanical damage. Repairing damage and chemical defenses are thought to be more energetically expensive than growth development, confirming the trade-offs and allocation of resources seen in this source-sink model.

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“…Stem weight at flowering is important for increasing grain weight and yield; in other words, stronger sink activity (e.g. HGW and GR, and larger ear size) is one of the main reasons for achieving greater grain weight (Zhao et al, 2020).…”

Section: Physiological Basis Of Correlations Between Yield and Its Component Variables And Agronomic Treatmentsmentioning

confidence: 99%

Phenotypic Traits, Grain Yield and Yield Components of Maize Cultivars Under Combinations of Management Practices in Semi-arid Conditions of Iran

Jahangirlou

Akbari

Alahdadi

et al. 2021

Int. J. Plant Prod.

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In semi-arid regions, selecting cultivars and planning management practices are critical issues for improving yields and reducing risks of maize cultivation in the short summer cropping season. This study aimed to assess the responses of grain yield (GY) and important phenotypic characteristics of maize cultivars from different maturity groups under various irrigation regimes, planting dates, and nitrogen rates, in a 2-year experiment. According to the clusters identified in the loading plot, stover yield, radiation use efficiency (RUE), height, leaf greenness index, stem weight, and ear size during flowering (VT/R1) were strongly correlated with GY, yield components and harvest index. Based on analysis of variance, more irrigation or N, or their interaction often increased GY, rows ear−1, grains row−1 and hundred-grain weight. Late planting decreased GY of KSC704 (late maturity cultivar). KSC260 (early maturity cultivar) had greater flexibility in planting time, required less days for maturity, and had less water consumption. The findings highlight the physiological basis of the relationship between the different phenotypic characteristics and how they affect GY and its components. They were in line with the established theories that higher RUE, biomass and sink activity (e.g. grain weight and numbers, and larger ear size) are associated with better genetic gains to produce high GY. Although the results were not consistent between years, findings suggested the good performance of recently released early maturity cultivars for use during the summer growing season.

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Source–Sink Adjustment: A Mechanistic Understanding of the Timing and Severity of Drought Stress on Photosynthesis and Grain Yields of Two Contrasting Oat (Avena sativa L.) Genotypes

Cited by 37 publications

References 58 publications

The Performance of Oat-Vetch Mixtures in Organic and Conventional Farming Systems

The Performance of Oat-Vetch Mixtures in Organic and Conventional Farming Systems

A source-sink model explains the difference in the metabolic mechanism of mechanical damage to young and senescing leaves in Catharanthus roseus

Phenotypic Traits, Grain Yield and Yield Components of Maize Cultivars Under Combinations of Management Practices in Semi-arid Conditions of Iran

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