Nitrogen supply influences photosynthesis establishment along the sugarcane leaf

Bassi, D.; Menossi, Marcelo; Mattiello, Lúcia

doi:10.1038/s41598-018-20653-1

Cited by 199 publications

(134 citation statements)

References 82 publications

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“…N content per leaf area explains 35% of the genetic variation of photosynthesis in rice [37], the allocation of N in the photosynthetic mechanism directly impacts photosynthesis and N use efficiency [6]. In sugarcane plant, N increased the photosynthetic properties by increasing the chlorophyll content, Rubisco enzymes activation, sugar content and photosynthesis-related metabolites [38]. In this study, the leaf N concentration in Fgl was significantly higher than that in Zhefu802, except for under HN treatment.…”

Section: High N Supply Does Not Lead To Ideal Photosynthetic Rate Andmentioning

confidence: 49%

Non-Photochemical Quenching Involved in the Regulation of Photosynthesis of Rice Leaves under High Nitrogen Conditions

Cisse

Zhao

et al. 2020

IJMS

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Excess and deficient nitrogen (N) inhibit photosynthesis in the leaves of rice plants, but the underlying mechanism is still unclear. N can improve the chlorophyll content and thus affect photon absorption, but the photosynthetic rate does not increase accordingly. To investigate this mechanism, three concentrations of N treatments were applied to two rice varieties, Zhefu802 and Fgl. The results indicated increased chlorophyll content of leaves with an increased N supply. Little discrepancy was detected in Rubisco enzyme activity and Non-photochemical quenching (NPQ) in the high nitrogen (HN) and moderate nitrogen (MN) treatments. The model that photoinhibition occurs in Zhefu802 due to a lack of balance of light absorption and utilization is supported by the higher malondialdehyde (MDA) content, higher H 2 O 2 content, and photoinhibitory quenching (qI) in HN treatment compared with MN treatment. A lower proportion of N in leaf was used to synthesize chlorophyll for Fgl compared with Zhefu802, reducing the likelihood of photoinhibition under HN treatment. In conclusion, HN supply does not allow ideal photosynthetic rate and increases the likelihood of photoinhibition because it does not sustain the balance of light absorption and utilization. Apart from Rubisco enzyme activity, NPQ mainly contributes to the unbalance. These results of this study will provide reference for the effective N management of rice. Int. J. Mol. Sci. 2020, 21, 2115 2 of 17 reaction center, resulting in 3P680 * , a triple state of the chlorophyll molecules [11]. The triple molecules can react with O 2 to generate deleterious singlet O 2 ( 1 O 2 ) [12], degrade the PSII reaction center protein D1, inactivate PSII and inhibit photosynthesis [13]. To eliminate damage from excessive light, plants have evolved some photoprotective mechanisms [7]. One mechanism is to dissipate the excessive excitation energy as heat in PSII antenna complex, which is known as non-photochemical quenching (NPQ) of chlorophyll fluorescence [14,15]. Although ubiquitous, the role of NPQ in plant productivity remains uncertain because it momentarily reduces the quantum efficiency of photosynthesis. Hubbart et al. [16] assessed photoprotection in rice at the whole canopy scale, and demonstrated that compared to wild-type plants, the overexpression of PsbS resulted in higher NPQ, increased canopy radiation use efficiency, and grain yield in fluctuating light. Genotypic variation of NPQ in rice was observed under natural solar radiation [17]. Wang et al. [8] reported that OsPsbS1 explains more than 40% of the NPQ variation. According to the induction speed of the relaxation kinetics curve in the dark, NPQ can be divided into three main components: qE, energy-dependent quenching, or fast NPQ, which is induced in seconds and is based on the proton gradient across the thylakoid membrane; qT, state transition quenching, or middle NPQ, which is induced in minutes; and the third component, qI, photo-inhibition quenching, or slow NPQ, which is induced very slowly [18,19]. The ...

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Section: High N Supply Does Not Lead To Ideal Photosynthetic Rate Andmentioning

confidence: 49%

Non-Photochemical Quenching Involved in the Regulation of Photosynthesis of Rice Leaves under High Nitrogen Conditions

Cisse

Zhao

et al. 2020

IJMS

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“…In addition, PH induced in plants at 0, 15, and 30 kg ha −1 the remobilization of N reserves from roots both as nitrate and as amides and their translocation to shoot, consequently improving the leaf nutritional status and yield. The higher availability of Mg, amino acids and nitrate, in particular under 0 kg ha −1 suboptimal conditions, can contribute to improve photosynthesis through arestoration of photosynthetic proteins, in particular RUBISCO that constitutes more than 50% of soluble leaf proteins [75], and pigments, increasing the SPAD index and therefore the photochemical efficiency and activity of photosystem II (PSII) [76]. Moreover, the stimulation of CO 2 fixation, together with oxidative pentose phosphate pathway, is crucial for providing metabolic precursors for amino acid synthesis via transaminases [77].…”

Section: Discussionmentioning

confidence: 99%

Morphological and Physiological Responses Induced by Protein Hydrolysate-Based Biostimulant and Nitrogen Rates in Greenhouse Spinach

et al. 2019

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Plant-derived protein hydrolysates (PHs) are gaining prominence as biostimulants due to their potential to improve yield and nutritional quality even under suboptimal nutrient regimens. In this study, we investigated the effects of foliar application of a legume-derived PH (0 or 4 mL L−1) on greenhouse baby spinach (Spinacia oleracea L.) under four nitrogen (N) fertilization levels (0, 15, 30, or 45 kg ha−1) by evaluating morphological and colorimetric parameters, mineral composition, carbohydrates, proteins, and amino acids. The fresh yield in untreated and biostimulant-treated spinach plants increased in response to an increase in N fertilization from 1 up to 30 kg ha−1, reaching a plateau thereafter indicating the luxury consumption of N at 45 kg ha−1. Increasing N fertilization rate, independently of PH, lead to a significant increase of all amino acids with the exception of alanine, GABA, leucine, lysine, methionine, and ornithine but decreased the polyphenols content. Interestingly, the fresh yield at 0 and 15 kg ha−1 was clearly greater in PH-treated plants compared to untreated plants by 33.3% and 24.9%, respectively. This was associated with the presence in of amino acids and small peptides PH ‘Trainer®’, which act as signaling molecules eliciting auxin- and/or gibberellin-like activities on both leaves and roots and thus inducing a “nutrient acquisition response” that enhances nutrients acquisition and assimilation (high P, Ca, and Mg accumulation) as well as an increase in the photochemical efficiency and activity of photosystem II (higher SPAD index). Foliar applications of the commercial PH decreased the polyphenols content, but on the other hand strongly increased total amino acid content (+45%, +82%, and +59% at 0, 15, and 30 kg ha−1, respectively) but not at a 45-kg ha−1-rate. Overall, the use of PH could represent a sustainable tool for boosting yield and nitrogen use efficiency and coping with soil fertility problems under low input regimens.

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“…For nitrogen concentration, the plants of Annona cacans Warm., grown at the 4 and 8 g L -1 doses of CRF added to the substrate, showed a higher concentration of this nutrient (Table 2). Nitrogen is considered an essential element for plants, as it is present in the composition of amino acids, amides, proteins, nucleic acids, coenzymes, chlorophylls and secondary metabolites, all directly or indirectly related to the biochemical and physiological processes which are indispensable to plant growth (Bassi et al, 2018). Mean values followed by the same letter in a column do not differ by Tukey's test (p≤5%).…”

Section: Journal Of Agricultural Studiesmentioning

confidence: 99%

Controlled-Release Fertilizer in the Production of Seedlings of Anonna cacans Warm

Smiderle

Souza

Menegatti

2020

JAS

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The use of controlled-release fertilizers is a promising alternative for supplying nutrients during the initial growth of nursery seedlings. The aim of this study was to verify the effects of different doses of controlled-release fertilizer (CRF) on initial growth and nutritional status in seedlings of Anonna cacans Warm. The seeds were originally sown in a seedbed and then, after initial seedling development, were transplanted into polyethylene bags containing a substrate of washed medium sand, to which different doses of CRF had been added before transplanting. The experimental design was completely randomised, with four treatments, five doses of Osmocote® NPK 19-06-10 formulation (0, 1, 2, 4 and 8 g L -1 of substrate), with four replications, each replication comprising three seedlings (one in each container).Increases in root-collar diameter and plant height were determined throughout the experimental period (6 months) from data collected every 30 days after transplanting. At the end of the experiment the following were evaluated: height, root-collar diameter, N concentration, chlorophyll index, chlorophyll concentration (a, b and total) and leaf area. Root-collar diameter and height showed a positive linear response to increases in the fertilizer dose. From a 4 g L -1 dose of CRF, the nutrient supply added to the substrate of medium sand optimises the initial phase of plant growth and guarantees the adequate nutritional status of Anonna cacans, and can be suggested as a viable technique for use in forest nurseries, and one which results in efficient use of the input material and avoids fertilizer wastage.

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Nitrogen supply influences photosynthesis establishment along the sugarcane leaf

Cited by 199 publications

References 82 publications

Non-Photochemical Quenching Involved in the Regulation of Photosynthesis of Rice Leaves under High Nitrogen Conditions

Non-Photochemical Quenching Involved in the Regulation of Photosynthesis of Rice Leaves under High Nitrogen Conditions

Morphological and Physiological Responses Induced by Protein Hydrolysate-Based Biostimulant and Nitrogen Rates in Greenhouse Spinach

Controlled-Release Fertilizer in the Production of Seedlings of Anonna cacans Warm

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