Opposing shifts in distributions of chlorophyll concentration and composition in grassland under warming

Zhang, Yao; He, Nianpeng; Yu, Guirui

doi:10.1038/s41598-021-95281-3

Cited by 5 publications

(5 citation statements)

References 58 publications

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“…Chl and carotenoids are indirect biochemical indicators of photosynthetic activity [85]. The chl a/b ratio is expected to increase when the leaf N content decreases [86,87].…”

Section: Discussionmentioning

confidence: 99%

Epiphytic PGPB Bacillus megaterium AFI1 and Paenibacillus nicotianae AFI2 Improve Wheat Growth and Antioxidant Status under Ni Stress

Pishchik

Filippova

Mirskaya

et al. 2021

Plants

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The present study demonstrates the Ni toxicity-ameliorating and growth-promoting abilities of two different bacterial isolates when applied to wheat (Triticum aestivum L.) as the host plant. Two bacterial strains tolerant to Ni stress were isolated from wheat seeds and selected based on their ability to improve the germination of wheat plants; they were identified as Bacillus megaterium AFI1 and Paenibacillus nicotianae AFI2. The protective effects of these epiphytic bacteria against Ni stress were studied in model experiments with two wheat cultivars: Ni stress-tolerant Leningradskaya 6 and susceptible Chinese spring. When these isolates were used as the inoculants applied to Ni-treated wheat plants, the growth parameters and the levels of photosynthetic pigments of the two wheat cultivars both under normal and Ni-stress conditions were increased, though B. megaterium AFI1 had a more pronounced ameliorative effect on the Ni contents in plant tissues due to its synthesis of siderophores. Over the 10 days of Ni exposure, the plant growth promotion bacteria (PGPB) significantly reduced the lipid peroxidation (LPO), ascorbate peroxidase (APX), superoxide dismutase (SOD) activities and proline content in the leaves of both wheat cultivars. The PGPB also increased peroxidase (POX) activity and the levels of chlorophyll a, chlorophyll b, and carotenoids in the wheat leaves. It was concluded that B. megaterium AFI1 is an ideal candidate for bioremediation and wheat growth promotion against Ni-induced oxidative stress, as it increases photosynthetic pigment contents, induces the antioxidant defense system, and lowers Ni metal uptake.

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“…Chl and carotenoids are indirect biochemical indicators of photosynthetic activity [85]. The chl a/b ratio is expected to increase when the leaf N content decreases [86,87].…”

Section: Discussionmentioning

confidence: 99%

Epiphytic PGPB Bacillus megaterium AFI1 and Paenibacillus nicotianae AFI2 Improve Wheat Growth and Antioxidant Status under Ni Stress

Pishchik

Filippova

Mirskaya

et al. 2021

Plants

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“…The original plant images obtained in the experiment have a high resolution and large storage capacity, but most of the information is redundant, which will reduce the efficiency and accuracy of plant 3D point cloud reconstruction. In order to eliminate irrelevant information, such as background and ground, this study plans to perform image pre-processing as shown in Figure 2 3) is utilized to overlay the noise-reduced image (6) mask, resulting in the mask image (7). The size of an individual image in this process ranges from 0.7 to 0.9 MB.…”

Section: Image Pre-processingmentioning

confidence: 99%

“…The control checks (CK) group model shown in picture (5), sufficient water conditions provide plants with energy for photosynthesis. The plant maintains normal growth status, and chlorophyll is still distributed gradually from top to bottom among the poplar trees; in the severe drought group shown in picture (7), severe water shortage in the plants caused the leaves to wilt and turn yellow, increase the inclination angle in a short period of time, limit photosynthesis, some leaves have fallen off, and the overall chlorophyll content dropped sharply. But at the same time, from picture (6) combined with the analysis results in Figure 10, the consistent point between severe drought and mild drought is that the upper leaves of the four varieties of poplar trees still have slightly increased values, and the elevated value in the mild drought group was greater than that in the severe drought group.…”

Section: Visualization Of 3d Distribution Of Poplar Chlorophyllmentioning

confidence: 99%

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Three-Dimensional Quantification and Visualization of Leaf Chlorophyll Content in Poplar Saplings under Drought Using SFM-MVS

Tian,

Zhang,

Bian

et al. 2023

Forests

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As global temperatures warm, drought reduces plant yields and is one of the most serious abiotic stresses causing plant losses. The early identification of plant drought is of great significance for making improvement decisions in advance. Chlorophyll is closely related to plant photosynthesis and nutritional status. By tracking the changes in chlorophyll between plant strains, we can identify the impact of drought on a plant’s physiological status, efficiently adjust the plant’s ecosystem adaptability, and achieve optimization of planting management strategies and resource utilization efficiency. Plant three-dimensional reconstruction and three-dimensional character description are current research hot spots in the development of phenomics, which can three-dimensionally reveal the impact of drought on plant structure and physiological phenotypes. This article obtains visible light multi-view images of four poplar varieties before and after drought. Machine learning algorithms were used to establish the regression models between color vegetation indices and chlorophyll content. The model, based on the partial least squares regression (PLSR), reached the best performance, with an R2 of 0.711. The SFM-MVS algorithm was used to reconstruct the plant’s three-dimensional point cloud and perform color correction, point cloud noise reduction, and morphological calibration. The trained PLSR chlorophyll prediction model was combined with the point cloud color information, and the point cloud color was re-rendered to achieve three-dimensional digitization of plant chlorophyll content. Experimental research found that under natural growth conditions, the chlorophyll content of poplar trees showed a gradient distribution state with gradually increasing values from top to bottom; after being given a short period of mild drought stress, the chlorophyll content accumulated. Compared with the value before stress, it has improved, but no longer presents a gradient distribution state. At the same time, after severe drought stress, the chlorophyll value decreased as a whole, and the lower leaves began to turn yellow, wilt and fall off; when the stress intensity was consistent with the duration, the effect of drought on the chlorophyll value was 895 < SY-1 < 110 < 3804. This research provides an effective tool for in-depth understanding of the mechanisms and physiological responses of plants to environmental stress. It is of great significance for improving agricultural and forestry production and protecting the ecological environment. It also provides decision-making for solving plant drought problems caused by global climate change.

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“…Chlorophyll plays a pivotal role in the photosynthesis process by transferring the energy of photons to the reaction center of PSII (Taiz and Zeiger 2010). In general, chlorophyll content can reflect the amount of photon energy absorbed per unit area and is a well-known indicator of physiological characteristics such as plant productivity (Anderson 1967;Zhang et al 2021). Measurements of chlorophyll content over the season showed that R. rugosa in the Goraebul coastal dunes had higher chlorophyll a and carotenoid content, while there was no significant difference between the two habitats for chlorophyll b (Fig.…”

Section: Chlorophyll Contentmentioning

confidence: 99%

Ecophysiological characteristics of Rosa rugosa under different environmental factors

Kim,

Yim,

Sim

et al. 2023

J Ecol Environ

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Background: Ecophysiological characteristics of Rosa rugosa were analyzed under different environmental factors from May to October 2022. Photosynthesis, chlorophyll fluorescence, chlorophyll content, leaf water content (LWC), osmolality, carbohydrate content, and total ion content were measured to compare the physiological characteristics of R. rugosa at two study sites (i.e., in large pots and in the Goraebul coastal sand dune area). Results: When R. rugosa was exposed to high temperatures, photosynthetic parameters including net photosynthetic rate (P N ) and stomatal conductance (g s ) in both experiment areas declined. In addition, severe photoinhibition occurs when R. rugosa is continuously exposed to high photosynthetically active radiation (PAR), and because of this, relatively low Y(II) (i.e., the quantum yield of photochemical energy conversion in photosystem II [PSII]) and high Y(NO) (i.e., the quantum yield of non-regulated, non-photochemical energy loss in PSII) in the R. rugosa of the pot were observed. As the high Y(NPQ) (i.e., the quantum yield of regulated non-photochemical energy loss in PSII) of R. rugosa in the coastal sand dune, they dissipated the excessed photon energy through the non-photochemical quenching (NPQ) mechanism when they were exposed to relatively low PAR and low temperature. Rosa rugosa in the coastal sand dune has higher chlorophyll a and carotenoid content. The high chlorophyll a + b and low chlorophyll a/b ratios seemed to optimize light absorption in response to low PAR. High carotenoid content played an important role in NPQ. As a part of the osmotic regulation in response to low LWCs, R. rugosa exposed to high temperatures and continuously high PAR used soluble carbohydrates and ions to maintain high osmolality. Conclusions: We found that F v /F m was lower in the potted plants than in the coastal sand dune plants, indicating the vulnerability of R. rugosa to high temperatures and PAR levels. We expect that the suitable habitat range for R. rugosa will shrink and move to north under climate change conditions.

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Opposing shifts in distributions of chlorophyll concentration and composition in grassland under warming

Cited by 5 publications

References 58 publications

Epiphytic PGPB Bacillus megaterium AFI1 and Paenibacillus nicotianae AFI2 Improve Wheat Growth and Antioxidant Status under Ni Stress

Epiphytic PGPB Bacillus megaterium AFI1 and Paenibacillus nicotianae AFI2 Improve Wheat Growth and Antioxidant Status under Ni Stress

Three-Dimensional Quantification and Visualization of Leaf Chlorophyll Content in Poplar Saplings under Drought Using SFM-MVS

Ecophysiological characteristics of Rosa rugosa under different environmental factors

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