Maize prolificacy under contrasting plant densities and N supplies: II. Growth per plant, biomass partitioning to apical and sub-apical ears during the critical period and kernel setting

D'andrea, Karina Elizabeth; Parco, Martín; Maddonni, Gustavo Ángel

doi:10.1016/j.fcr.2022.108557

Cited by 8 publications

(4 citation statements)

References 32 publications

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“…In addition, we show the effects observed in experiments involving only one of these two stresses to demonstrate that the effects observed in the experiments involving stress combination are largely representative of the more numerous cases where only one stress was considered. We included experiments conducted with maize crops that examined at least two traits associated with the numerical components or the physiological determinants of grain yield, provided information about crop evapotranspiration (drought experiments) or absorbed nitrogen (nitrogen deficiency experiments), and showed a reduction in grain yield caused by each stress that exceeded 10% (D'Andrea et al, 2008(D'Andrea et al, , 2009(D'Andrea et al, , 2022Hao et al, 2015;Hern andez et al, 2015;Li et al, 2017;Muchow, 1994;Munaro et al, 2011;Nagore et al, 2017;Parco et al, 2020;Teixeira et al, 2014;Uhart & Andrade, 1995;Wang et al, 2017;Wolfe et al, 1988). In these experiments, drought caused an average reduction of crop evapotranspiration of 32% (range 13-70%) and nitrogen deficiency caused an average reduction of the amount of absorbed nitrogen of 64% (range 34-85%); that is, the reductions were more severe for nitrogen than for water availability.…”

Section: Yield Components and Eco-physiological Determinantsmentioning

confidence: 99%

“…ns, not significant; *, P < 0.05; **, P < 0.01; ***, P < 0.001. The meta‐analysis includes the following studies: Muchow, 1994; Uhart & Andrade, 1995; D'Andrea et al., 2008; D'Andrea et al., 2009; Munaro et al., 2011; Teixeira et al., 2014; Hao et al., 2015; Hernández et al., 2015; Wang et al., 2017; Nagore et al., 2017; Parco et al., 2020; D'Andrea et al., 2022 (left), Wolfe et al., 1988; Munaro et al., 2011; Teixeira et al., 2014; Hernández et al., 2015; Li et al., 2017 (right). Experimental conditions and stress treatments are detailed in Table S1.…”

Section: Water Restriction and Nitrogen Deficiencymentioning

confidence: 99%

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Eco‐physiology of maize crops under combined stresses

Cagnola,

D'Andrea,

Rotili

et al. 2023

The Plant Journal

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SUMMARYThe yield of maize (Zea mays L.) crops depends on their ability to intercept sunlight throughout the growing cycle, transform this energy into biomass and allocate it to the kernels. Abiotic stresses affect these eco‐physiological determinants, reducing crop grain yield below the potential of each environment. Here we analyse the impact of combined abiotic stresses, such as water restriction and nitrogen deficiency or water restriction and elevated temperatures. Crop yield depends on the product of kernel yield per plant and the number of plants per unit soil area, but increasing plant population density imposes a crowding stress that reduces yield per plant, even within the range that maximises crop yield per unit soil area. Therefore, we also analyse the impact of abiotic stresses under different plant densities. We show that the magnitude of the detrimental effects of two combined stresses on field‐grown plants can be lower, similar or higher than the sum of the individual stresses. These patterns depend on the timing and intensity of each one of the combined stresses and on the effects of one of the stresses on the status of the resource whose limitation causes the other. The analysis of the eco‐physiological determinants of crop yield is useful to guide and prioritise the rapidly progressing studies aimed at understanding the molecular mechanisms underlying plant responses to combined stresses.

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Section: Yield Components and Eco-physiological Determinantsmentioning

confidence: 99%

Section: Water Restriction and Nitrogen Deficiencymentioning

confidence: 99%

Eco‐physiology of maize crops under combined stresses

Cagnola,

D'Andrea,

Rotili

et al. 2023

The Plant Journal

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“…In the hybrids, the reductions in these traits were in the order of 36.3%, 46.4%, 27.6%, 41.0%, and 38.5%. Except for RNC, the nutrient reduction resulted in higher heterosis estimates in the high nitrogen supply environment for all traits, namely: 17.1% (LNC), 15.0% (SNC), 16.1% (STNC), and 12.3% (PNC) (Table 1).…”

Section: Traits Of Plant Architecture and Nitrogen Use Efficiencymentioning

confidence: 99%

“…N represents up to 5% of total dry matter [11] and is a constituent of leaf pigments, such as chlorophyll, amino acids, nucleic acids, proteins, and plant hormones [12,13]. The low availability of nitrogen in the soil directly impacts corn yield, with adverse effects on the weight and length of ears [14], 100-grain weight, prolificacy [15,16], as well as plant height [17]. These compromises in the agronomic components of production result from the effects of N limitation on photosynthetic capacity [18].…”

Section: Introductionmentioning

confidence: 99%

Exploring the Potential of Heterosis to Improve Nitrogen Use Efficiency in Popcorn Plants

Santos

Júnior

Bispo

et al. 2023

Plants

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Nitrogen is crucial for plant growth and development, and improving nitrogen use efficiency (NUE) is a viable strategy for reducing dependence on nitrogen inputs and promoting sustainability. While the benefits of heterosis in corn are well known, the physiological mechanisms underlying this phenomenon in popcorn are less understood. We aimed to investigate the effects of heterosis on growth and physiological traits in four popcorn lines and their hybrids under two contrasting nitrogen conditions. We evaluated morpho-agronomic and physiological traits such as leaf pigments, the maximum photochemical efficiency of PSII, and leaf gas exchange. Components associated with NUE were also evaluated. N deprivation caused reductions of up to 65% in terms of plant architecture, 37% in terms of leaf pigments, and 42% in terms of photosynthesis-related traits. Heterosis had significant effects on growth traits, NUE, and foliar pigments, particularly under low soil nitrogen conditions. N-utilization efficiency was found to be the mechanism favoring superior hybrid performance for NUE. Non-additive genetic effects were predominant in controlling the studied traits, indicating that exploring heterosis is the most effective strategy for obtaining superior hybrids to promote NUE. The findings are relevant and beneficial for agro farmers seeking sustainable agricultural practices and improved crop productivity through the optimization of nitrogen utilization.

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Yield determination of temperate maize hybrids with different end‐uses: An ecophysiological analysis

Chazarreta,

Alvarez Prado,

Giménez

et al. 2024

Crop Science

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Maize (Zea mays L.) production in Argentina changed markedly during the last decade due to the widespread adoption of late sowing dates, expanding its productive area, and diversifying crop end‐uses. This study was conducted to assess how the sowing date and nitrogen (N) availability affect grain yield, its physiological determinants (biomass and its partitioning), and numeric components (kernel number and kernel weight) of maize hybrids marketed for different end‐uses. Field experiments were conducted in two growing seasons (2019–2020 and 2020–2021) and two sowing dates within each season (early and late) at a site in the main maize‐producing region of Argentina. Within each season × sowing date combination, eight commercial maize hybrids (commercialized as grain, dual‐purpose, or silage) were tested under two N levels (N0: no N applied; N250: fertilized with 250 kg N ha−1). The greatest grain yield, biomass, kernel number, and harvest index corresponded to the grain hybrids. Dual‐purpose hybrids showed an intermediate grain yield, the highest kernel weight, and a more “silage” than “graniferous” behavior. Silage hybrids had improved light interception up to silking + 15 days (R2) but exhibited the lowest grain yield. Differences in end‐use steered crop breeding efforts toward different physiological strategies. The improved understanding of the physiological mechanisms underlying the productivity among maize hybrids with varying end‐uses will assist in the selection and management of suitable cultivars to be grown under different systems and environmental variations associated with an extended sowing date period.

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Maize prolificacy under contrasting plant densities and N supplies: II. Growth per plant, biomass partitioning to apical and sub-apical ears during the critical period and kernel setting

Cited by 8 publications

References 32 publications

Eco‐physiology of maize crops under combined stresses

Eco‐physiology of maize crops under combined stresses

Exploring the Potential of Heterosis to Improve Nitrogen Use Efficiency in Popcorn Plants

Yield determination of temperate maize hybrids with different end‐uses: An ecophysiological analysis

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