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Transcriptome response to phosphorus starvation in rice

100%

Cai H., Xie W., Zhu T., Lian X.

Acta Physiologiae Plantarum

2012

tom 34

nr 1

Phosphorus (P) is an essential mineral nutrient required for the plant growth and development. Insufficient P supply triggers extensive physiological and biochemical changes in plants. In this study, we used Affymetrix GeneChip rice genome arrays to analyze the dynamics of rice transcriptome under P starvation. Phosphorus starvation induced or suppressed transcription of 2,317 genes, representing 7.2% of the genes. These changes, mostly transient, affected various cellular metabolic pathways including stress response, primary and secondary metabolism, molecular transport, regulatory process and organismal development. Hundred and thirty (5.6% of 2,317 genes) transcripts were expressed similarly both in root and shoot under P starvation. Comparative analysis between rice and Arabidopsis identified 37 orthologous groups that responded to P starvation demonstrating the existence of conserved P stress coupling mechanism among dicot and monocot plants. Additional analysis of transcription profiles of microRNAs revealed differential expression of miR399 and miR169 under P starvation suggesting their potential roles in plant nutrient homeostasis. Analysis of genome-wide gene expression profiles in P starvation in rice shoot and root, using Affymetrix Rice Genome Chip in this paper, has provided an overview of transcriptional responses to the P starvation condition. This will bring very valuable information and will make a great contribution for investigating the response of rice to P starvation.

Development of a hybrid partial-nitrification and anammox reactor with stirrer

76%

Lyu L., Zhu Y., Zhang K., Ma Y., Pan Y., Zhu T.

Polish Journal of Environmental Studies

2019

tom 28

nr 3

This study developed the hybrid partial-nitrification and anammox (HPNA) reactor to increase efficiency in ammonia nitrogen (NH₄⁺-N) removal. The HPNA reactor contained a fixed bed filled with biofilm carrier and a fluidized bed with mechanical stirrer to maximize withholding the sludge. The reactor achieved a total nitrogen (TN) removal efficiency of 70% and NH₄⁺-N removal efficiency of 84%. The maximum nitrogen loading rate (NLR) of 6.1 kg-N/m³/d and nitrogen removal rate (NRR) of 4.7 kg-N/m³/d were achieved with a short hydraulic retention time (HRT) of 3 h. After 160 days of operation, both the mixed liquid suspended solids (MLSS) and the mixed liquor volatile suspended solids (MLVSS) increased in the lower part (from 3.7 to 14.7 g/L and 1.8 to 10.9 g/L, respectively) and the upper part (from 3.7 to 11.8 g/L and 1.9 to 6.7 g/L, respectively). The proteins (PN)/ polysaccharides (PS) ratio increased from 0.96 to 1.1 in the lower part but decreased to 0.7 in the upper part. Bacterial community profiles generated from 16S rRNA sequences further showed that the ammonium-oxidizing bacteria (AOB) Nitrosomonas and the anammox bacterium Brocadiales were enriched in the HPNA reactor.

An orthogonal test of the effect of NO3−, PO43−, K+, and Ca2+ on the growth and ion absorption of Elaeagnus angustifolia L. seedlings under salt stress

76%

Li L., Zhu T., Liu J., Zhao C., Li L., Chen M.

Acta Physiologiae Plantarum

2019

tom 41

nr 11

Excess salts in soil severely inhibit plant growth and yield. Various nutrients can relieve the inhibitory effect of salt on plants. Elaeagnus angustifolia is a tree species that is utilized in landscaping and ecological restoration in China and shows tolerance to saline soils. In this experiment, we first determined the optimal concentration of single-nutrient inputs for promoting growth of E. angustifolia seedlings and alleviating salt stress. The optimal nitrogen (NO₃⁻), phosphorus (PO₄³ ⁻), potassium (K⁺ ), and calcium (Ca²⁺ ) concentrations under salt stress were 2, 0.6, 2, and 2 mM, respectively. Based on this result, we carried out an optimum nutrient ratio experiment by a four-factor and three-level orthogonal experiment. The results showed that under normal growth conditions, the optimal nutrient combinations for NO₃⁻, PO₄³ ⁻, K⁺ , and Ca²⁺ were 2, 0.6, 5, and 1 mM; 5, 0.2, 5, and 2 mM; and 5, 0.6, 1, and 5 mM, respectively, which increased plant height, biomass, and the chlorophyll content of E. angustifolia seedlings. Under salt stress, the optimal nutrient combinations were 5, 0.2, 5, and 2 mM; and 5, 0.6, 1, and 5 mM, respectively. This study provides a theoretical basis for optimal fertilization of E. angustifolia seedlings in saline-alkali soils.

Ograniczanie wyników

2 Acta Physiologiae Plantarum

1 Polish Journal of Environmental Studies

3 Zhu T.

1 Cai H.

1 Chen M.

1 Li L.

1 Lian X.

1 Liu J.

1 Lyu L.

1 Ma Y.

1 Pan Y.

1 Xie W.

1 Zhang K.

1 Zhao C.

1 Zhu Y.

2 2019

1 2012

Wyniki wyszukiwania

Transcriptome response to phosphorus starvation in rice

Development of a hybrid partial-nitrification and anammox reactor with stirrer

An orthogonal test of the effect of NO3−, PO43−, K+, and Ca2+ on the growth and ion absorption of Elaeagnus angustifolia L. seedlings under salt stress