The effect of CaCl&lt;sub&gt;2&lt;/sub&gt; on calcium content, photosynthesis, and chlorophyll fluorescence of tung tree seedlings under drought conditions

Li, Zongchen; Lü, Kun; Liu, Z. M.; Wu, Lianguo

doi:10.1007/s11099-016-0676-x

Cited by 29 publications

(26 citation statements)

References 44 publications

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“…FM: leaves fresh mass; SM: leaves saturated mass; DM: leaves dry mass. The saturated mass was obtained after 24 h of leaf immersion in distilled water in the dark [70]. Nine seedlings for each treatment (three repetitions per treatment; three plants per replicate) and the leaves used for the measurements were kept under the same growth conditions and in similar growth positions.…”

Section: Determination Of Physiological Indexes Of C Oleifera 'Huaximentioning

confidence: 99%

Transcriptomic Analyses of Camellia oleifera ‘Huaxin’ Leaf Reveal Candidate Genes Related to Long-Term Cold Stress

et al. 2020

IJMS

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‘Huaxin’ is a new high-yielding timber cultivar of Camellia oleifera of high economic value, and has been widely cultivated in the red soil hilly region of Hunan Province of the People´s Republic of China in recent years. However, its quality and production are severely affected by low temperatures during flowering. To find genes related to cold tolerance and further explore new candidategenes for chilling-tolerance, Illumina NGS (Next Generation Sequencing) technology was used to perform transcriptomic analyses of C. oleifera ‘Huaxin’ leaves under long-term cold stress. Nine cDNA libraries were sequenced, and 58.31 Gb high-quality clean reads were obtained with an average of 5.92 Gb reads for each sample. A total of 191,150 transcripts were obtained after assembly. Among them, 100,703 unigenes were generated, and 44,610 unigenes were annotated. In total, 1564 differentially expressed genes (DEGs) were identified both in the A_B and A_C gene sets. In the current study, Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway enrichment analyses were performed, andrevealed a group of cold-responsive genes related to hormone regulation, photosynthesis, membrane systems, and osmoregulation; these genes encoded many key proteins in plant biological processes, such as serine/threonine-protein kinase (STPK), transcription factors (TFs), fatty acid desaturase (FAD), lipid-transfer proteins (LTPs), soluble sugars synthetases, and flavonoid biosynthetic enzymes. Some physiological indicators of C. oleifera ‘Huaxin’ were determined under three temperature conditions, and the results were consistent with the molecular sequencing. In addition, the expression levels of 12 DEGs were verified using quantitative real-time polymerase chain reaction (qRT-PCR). In summary, the results of DEGs analysis together with qRT-PCR tests contribute to the understanding of cold tolerance and further exploring new candidate genes for chilling-tolerance in molecular breeding programs of C. oleifera ‘Huaxin’.

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Section: Determination Of Physiological Indexes Of C Oleifera 'Huaximentioning

confidence: 99%

Transcriptomic Analyses of Camellia oleifera ‘Huaxin’ Leaf Reveal Candidate Genes Related to Long-Term Cold Stress

et al. 2020

IJMS

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“…Tung oil, which is extracted from tung seeds, exhibits traits that are highly valued in many industries (Park et al, 2008;Pfister et al, 2008), including rapid drying, chemical resistance, adhesiveness, and sleekness. These properties make tung oil a valuable drying ingredient in paints, varnishes, and other coatings and finishes (Cao and Shockey, 2012;Li et al, 2017b). With recent human population increases, tung trees have become a valuable biofuel species, with the potential to help resolve energy shortage problems (Tan et al, 2011).…”

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confidence: 99%

Growth, Physiological, and Biochemical Responses of Tung Tree (Vernicia fordii) Seedlings to Different Light Intensities

Li¹,

Shi²,

Zhang³

et al. 2019

horts

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As a result of its high photosynthetic efficiency, the tung tree (Vernicia fordii) is a fast-growing heliophile, yielding fruit within 3 years. In addition, tung oil extracted from the fruit seeds is an environmentally friendly paint used widely in China. However, mutual shading inside a tung tree canopy leads to a low yield of fruit because of weak or dead lower branches. In this project, a pot experiment was conducted to understand the growth, physiological, anatomical structure, and biochemical responses of tung trees under various shading levels. Tung tree seedlings were subjected to different light intensities—100% sunlight (no cover), L100; 75% sunlight (25% shading), L75; 50% sunlight (50% shading), L50; and 20% sunlight (80% shading), L20—from June to August. Results indicate that the L75 treatment reduced significantly the net photosynthetic rate (Pn), stomatal conductance (gS), transpiration rate (E), total aboveground and root dry weight (DW), maximum net photosynthetic rate (Amax), and maximum rate of electron transport at saturating irradiance (Jmax) compared with the control, although plant height and leaf area (LA) were not reduced. Lower light intensities (L50 and L20) and longer duration of treatment led to greater reduction in growth, leaf thickness, and photosynthetic potential (Amax and Jmax). Chlorophyll a (Chl a), chlorophyll b (Chl b), and total chlorophyll content were increased in the L50 and L20 treatments compared with L100 and L75. There was no significant reduction in the enzyme activities of ribulose-1,5-bisphosphate carboxylase (Rubisco) and phosphoenolpyruvate (PEPC) of the seedlings using the L75 treatment; however, lower light intensities (L50 and L20) and longer duration of shade treatment resulted in a significant reduction in enzyme activity. In summary, the results suggest that tung trees have greater photosynthetic activity under high light intensity. Shading, even at 20%, especially for the longer term, reduced photosynthetic efficiency and growth. To prevent growth reduction, tung trees should be grown under full sun with a daily light integral (DLI) of ≈46 mol·m‒2·d‒1, and mutual shading should be avoided by proper spacing and pruning.

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“…When gs and Ci are simultaneously reduced, the decrease in PN is mainly caused by stomatal limitations. In contrast, when PN decreases as Ci increases, photosynthesis is mainly limited by nonstomatal factors (Li et al 2017, Hu et al 2018. In our study, PN, gs, and Ci decreased simultaneously on the 4 th day in both groups, clearly indicating that the main cause of PN reduction was stomata closure.…”

Section: Discussionmentioning

confidence: 38%

Exogenous calcium-induced physiological and biochemical changes in tree peony (Paeonia section Moutan DC.) under drought stress

Zhang¹,

Fang²,

Liu³

et al. 2019

Photosynt.

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Tree peony (Paeonia section Moutan DC.) is an excellent ornamental plant, of which Paeonia ostii (P. ostii) has a high oil value. It is widely cultivated in China, but severe drought affects its growth. In this study, the effects of exogenous calcium on drought-induced damage of P. ostii were studied. The results showed that under drought stress, leaf water content showed a downward trend, while reactive oxygen species (ROS), relative electrical conductivity (REC), proline (Pro) content, and related antioxidant enzymes increased significantly. Spraying CaCl2 could effectively slow leaf wilting and water loss, induced an increase in enzyme activity of the antioxidant enzyme system, and reduced the accumulation of ROS caused by drought stress. Simultaneously, REC and Pro content could be alleviated, and the degree of cell membrane damage could be reduced. In addition, CaCl2 improved photosynthetic characteristics and chlorophyll fluorescence parameters. These results indicated that CaCl2 reduced the harmful effects of drought stress on the growth of P. ostii by regulating infiltration, activating photosynthesis, and enhancing the antioxidant system. These findings suggested that CaCl2 can be used to manage drought stress in P. ostii cultivation.Additional key words: ascorbate peroxidase; gas exchange; physiological index; relative water content; superoxide dismutase; water stress. (J. Tao) Abbreviations: APX -ascorbate peroxidase; Ci -intercellular CO2 concentration; DAB -diaminobenzidine; DM -dry mass; E -transpiration rate; F0 -minimal fluorescence yield of the dark-adapted state; Fm -maximal fluorescence yield of the dark-adapted state; FM -fresh mass; Fv/Fm -maximal quantum yield of PSII photochemistry; gs -stomatal conductance; PN -net photosynthetic rate; POD -peroxidase; Pro -free proline; qN -nonphotochemical quenching coefficient; REC -relative electrical conductivity; ROS -reactive oxygen species; SOD -superoxide dismutase; Y(II) -effective quantum yield of PSII photochemistry. Acknowledgments: The authors wish to thank two anonymous reviewers for their input and constructive criticism.

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The effect of CaCl<sub>2</sub> on calcium content, photosynthesis, and chlorophyll fluorescence of tung tree seedlings under drought conditions

Cited by 29 publications

References 44 publications

Transcriptomic Analyses of Camellia oleifera ‘Huaxin’ Leaf Reveal Candidate Genes Related to Long-Term Cold Stress

Transcriptomic Analyses of Camellia oleifera ‘Huaxin’ Leaf Reveal Candidate Genes Related to Long-Term Cold Stress

Growth, Physiological, and Biochemical Responses of Tung Tree (Vernicia fordii) Seedlings to Different Light Intensities

Exogenous calcium-induced physiological and biochemical changes in tree peony (Paeonia section Moutan DC.) under drought stress

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