Effect of intercropping on leaf senescence related to physiological metabolism in proso millet (Panicum miliaceum L.)

Gong, Xiangwei; Liu, C.J.; Uzizerimana, Ferdinand; Dang, Ke; Zhao, Guizhe; Yang, Pan; Feng, Baili

doi:10.32615/ps.2019.112

Cited by 21 publications

(19 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The intercropping combination of proso millet and mung bean has been regarded as a technically sound method based on the ecological principles of facilitation and complementarity. Thus, this practice has been rapidly applied in Northwest China (Gong et al, 2019a(Gong et al, , 2020a. To date, although field experiments have been conducted to evaluate the impacts of cereal-legume intercropping in recent years (Latati et al, 2016;Cao et al, 2017;Qian et al, 2018), information about crop productivity, soil microbial-mediated processes and N assimilation under proso millet-mung bean intercropping systems is still limited.…”

Section: Introductionmentioning

confidence: 99%

Intercropping Alters the Soil Microbial Diversity and Community to Facilitate Nitrogen Assimilation: A Potential Mechanism for Increasing Proso Millet Grain Yield

et al. 2020

View full text Add to dashboard Cite

Intercropping of cereals and legumes has been used in modern agricultural systems, and the soil microorganisms associated with legumes play a vital role in organic matter decomposition and nitrogen (N) fixation. This study investigated the effect of intercropping on the rhizosphere soil microbial composition and structure and how this interaction affects N absorption and utilization by plants to improve crop productivity. Experiments were conducted to analyze the rhizosphere soil microbial diversity and the relationship between microbial composition and N assimilation by proso millet (Panicum miliaceum L.) and mung bean (Vigna radiata L.) from 2017 to 2019. Four different intercropping row arrangements were evaluated, and individual plantings of proso millet and mung bean were used as controls. Microbial diversity and community composition were determined through Illumina sequencing of 16S rRNA and internal transcribed spacer (ITS) genes. The results indicated that intercropping increased N levels in the soil–plant system and this alteration was strongly dependent on changes in the microbial (bacterial and fungal) diversities and communities. The increase in bacterial alpha diversity and changes in unique operational taxonomic unit (OTU) numbers increased the soil N availability and plant N accumulation. Certain bacterial taxa (such as Proteobacteria) and fungal taxa (such as Ascomycota) were significantly altered under intercropping and showed positive responses to increased N assimilation. The average grain yield of intercropped proso millet increased by 13.9–50.1% compared to that of monoculture proso millet. Our data clearly showed that intercropping proso millet with mung bean altered the rhizosphere soil microbial diversity and community composition; thus, this intercropping system represents a potential mechanism for promoting N assimilation and increasing grain yield.

show abstract

Section: Introductionmentioning

confidence: 99%

Intercropping Alters the Soil Microbial Diversity and Community to Facilitate Nitrogen Assimilation: A Potential Mechanism for Increasing Proso Millet Grain Yield

et al. 2020

View full text Add to dashboard Cite

show abstract

“…However, previous studies on intercropping and nitrogen use only emphasized crop growth and yield with limited information on leaf senescence. Senescence is closely associated with the photosynthetic capacity and chlorophyll content of the leaf, and it increases toward crop maturity due to declining trends of photosynthesis and chlorophyll contents of the leaf after flowering [3]. In cereal crops, leaf senescence patterns profoundly impact grain yield and quality by regulating source-sink relationships for nutrient demand [3,4].…”

Section: Introductionmentioning

confidence: 99%

“…Senescence is closely associated with the photosynthetic capacity and chlorophyll content of the leaf, and it increases toward crop maturity due to declining trends of photosynthesis and chlorophyll contents of the leaf after flowering [3]. In cereal crops, leaf senescence patterns profoundly impact grain yield and quality by regulating source-sink relationships for nutrient demand [3,4]. Five traits are used to describe the leaf senescence patterns, and they include the maximum and minimum leaf greenness, the start of senescence, time to loss of 50% of peak leaf greenness, and the rate of senescence [5,6].…”

Section: Introductionmentioning

confidence: 99%

“…In comparison with sole crop systems, intercropping improves crop diversification, increases crop yield and stability, especially under low-input conditions, and improves soil fertility and conservation, as well as weed control [12][13][14]. Further, intercropping and other practices such as mulching have been reported to regulate senescence through increased net photosynthetic duration and prolonged leaf greenness in proso millet [3,15].…”

Section: Introductionmentioning

confidence: 99%

“…Intercropping and nitrogen addition have been shown to regulate the patterns of leaf senescence in many crops, for example, in proso millet [3,15], Maize [5,6,24], sorghum [5], and wheat [7], but the responsible mechanisms are only partially understood. erefore, understanding physiological processes such as senescence and their association with grain yield would help in the sorghum yield improvement process.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Intercropping and Nitrogen Fertilization Altered the Patterns of Leaf Senescence in Sorghum

Moi

Kitonyo

Chemining’wa

et al. 2021

International Journal of Agronomy

View full text Add to dashboard Cite

Leaf senescence regulates grain yield. However, the modulation of leaf senescence in sorghum under legume-based intercrop systems and nitrogen (N) fertilization is not known. The objective of the study was to investigate the effect of intercropping two sorghum (Gadam and Serena) and cowpea (K80, M66) varieties and sole cropping systems and different fertilizer N rates (0, 40, and 80 kg·N·ha−1) on the time course of postflowering sorghum leaf senescence and understand how senescence modulates grain yield. The experiment was laid out in a randomized complete block design with a split-plot arrangement with three replications. Leaf senescence was assessed from flowering to maturity at (a) whole-plant level by the visual scoring of green leaves and (b) flag leaf scale by measuring leaf greenness with a SPAD 502 chlorophyll meter. A logistic function in SigmaPlot was fitted to estimate four traits of leaf senescence, including minimum and maximum SPAD (SPADmin, SPADmax), time to loss of 50% SPADmax (EC50), and the rate of senescence. Irrespective of the cowpea variety, intercropping reduced sorghum grain yield by 50%. The addition of N increased yield by 27% but no effect was detected between 40 and 80 kg·N ha−1. Intercropping delayed leaf senescence at the whole plant by 0.2 leaves plant−1 day−1 but reduced SPADmax of the flag by 8 SPAD units and rate of senescence by 4 SPAD units day−1 compared with sole crop system. Fertilizer N delayed leaf senescence ( P ≤ 0.05 ) at whole-plant and flag leaf scales. Cropping System × nitrogen modulated senescence at whole-plant and flag leaf scales and sorghum grain yield but marginally influenced other traits. While EC50 did not correlate with grain yield, faster rates of senescence and leaf greenness were associated with high yield under the sole crop system. Overall, N was the main factor in driving sorghum leaf senescence while the intercropping effect on senescence was nonfunctional. Effects of competition in sorghum-legume intercropping and source-sink relationships on the patterns of leaf senescence deserve further investigation.

show abstract

Temporal dynamics of biodiversity effects and light‐use‐related traits in two intercropping systems

Engbersen

Stefan

Brooker

et al. 2021

J of Sust Agri & Env

View full text Add to dashboard Cite

Introduction: Intercropping systems can be more productive than their respective monocultures and this positive net biodiversity effect is caused by complementarity and selection effects. While the complementarity effect is caused through resource partitioning or facilitation, the selection effect operates via the greater probability that a more diverse community contains a dominant and high-yielding species which will account for the majority of productivity in that community. Here, we investigated how light-use-related traits contribute to the net biodiversity effect via complementarity or selection effects and how these qrelationships change throughout an annual growing season. Materials and Methods:We conducted weekly destructive harvests to examine temporal dynamics of biodiversity effects in two crop mixtures (oat-lupin and oat-camelina) and their respective monocultures. We linked the biodiversity effects to traits related to light use (i.e., light interception, plant height, photosynthetic efficiency and photosynthetic capacity) and investigated how these relationships changed over time.Results: We found that the net biodiversity and selection effect increased over time in both mixtures, while complementarity effects increased only in the oat-lupin mixture.More intercepted light and taller plants in mixtures compared to monocultures positively contributed to biodiversity effects in both mixtures. Strategies for shade tolerance differed between the mixtures, that is, increased photosynthetic capacity and increased photosynthetic efficiency contributed to a positive net biodiversity effect in the oat-lupin and oat-camelina mixture, respectively. Conclusion:By linking the temporal dynamics of the net biodiversity effect and its two additive components to light-use-related traits in two different crop mixtures, this study demonstrates that complementary light use contributes to overyielding in intercropping systems. Such understanding is important for the design of effective intercropping systems and developing new crop cultivars suited to these environments.

show abstract

Effect of intercropping on leaf senescence related to physiological metabolism in proso millet (Panicum miliaceum L.)

Cited by 21 publications

References 54 publications

Intercropping Alters the Soil Microbial Diversity and Community to Facilitate Nitrogen Assimilation: A Potential Mechanism for Increasing Proso Millet Grain Yield

Intercropping Alters the Soil Microbial Diversity and Community to Facilitate Nitrogen Assimilation: A Potential Mechanism for Increasing Proso Millet Grain Yield

Intercropping and Nitrogen Fertilization Altered the Patterns of Leaf Senescence in Sorghum

Temporal dynamics of biodiversity effects and light‐use‐related traits in two intercropping systems

Contact Info

Product

Resources

About