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Interactions between soil water and fertilizer on leaf photosynthesis and delta13C of Catalpa bungei seedlings

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Qiu Q., He Q., Wang J. H., Su Y., Ma J. W., Wu J. W., Li J. Y.

Dendrobiology

2016

tom 76

Our objective was to identify combinations of irrigation and fertiliser application that promoted the photosynthetic productivity and water use efficiency (WUE) of Catalpa bungei. Using response surface methodology based on a rotatable central composite design, we conducted a pot experiment with C. bungei clone 004-1 seedlings. The experiment quantified the effects of interactions between soil water content (W), nitrogen application rate (N), and phosphorus application rate (P) on leaf net photosynthetic rates (Pn), SPAD values (SPAD-502 meter readings of leaf chlorophyll), and carbon isotope composition (δ13C). N had significantly positive effects on the all three leaf parameters, while W had significantly negative effects on leaf δ13C signatures but positive effects on leaf Pn and SPAD values. The magnitude of the N effect exceeded that of the W effect. P had no significant effects on any of the three leaf parameters. The W × N interaction had significant positive effects on Pn and SPAD, but significant negative effects on leaf δ13C. Thus, irrigation and nitrogen application had different effects on seedling growth and WUE, and the two effects were interactive. Catalpa bungei growth was promoted by appropriately increasing nitrogen application and irrigation, but WUE was improved by increasing N and decreasing irrigation. Therefore, strategies for the irrigation and fertilisation of C. bungei plantations should be designed to appropriately balance plant growth and WUE.

Temporal pattern of the induction of SF-1 gene expression by the signal transduction pathway involving 3',5'-cyclic adenosine monophosphate

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Lehmann T. P., Biernacka-Lukanty J. M., Saraco N., Langlois D., Li J. Y., Trzeciak W. H.

Acta Biochimica Polonica

2005

tom 52

nr 2

The objective of our study was to investigate the effect of stimulation of the cAMP-dependent pathway on the expression of an orphan nuclear receptor, SF-1/Ad4BP in mouse adrenal tumour, Y-1 cells in culture. We evaluated the temporal pattern of the effects of corticotropin (ACTH) and the adenylyl cyclase activator forskolin on the level of SF-1 mRNA, and compared the time course of induction of SF-1 with that of CYP11A1. Forskolin, corticotropin and 8-Br-cAMP significantly elevated the level of the SF-1 transcript, after 1.5 h of incubation, with a concomitant increase of SF-1 protein level, observed after 6 h. The CYP11A1 transcript increased gradually over the incubation period, and reached the maximal level after 12 to 24 h. The steady-state level of the SF-1 transcript was unaffected by forskolin when the cells were incubated with actinomycin D, indicating that stimulation of the cAMP pathway results in enhanced transcription of the gene. The effect of forskolin was augmented by cycloheximide, suggesting that an inhibitory protein, whose synthesis was inhibited by cycloheximide, could be involved in negative regulation of SF-1 expression. It is concluded that SF-1 expression is positively regulated by the cAMP pathway at the transcriptional level, and can represent the primary event in cAMP-mediated induction of steroid hormone synthesis in Y-1 cells.

Ograniczanie wyników

1 Acta Biochimica Polonica

1 Dendrobiology

2 Li J. Y.

1 Biernacka-Lukanty J. M.

1 He Q.

1 Langlois D.

1 Lehmann T. P.

1 Ma J. W.

1 Qiu Q.

1 Saraco N.

1 Su Y.

1 Trzeciak W. H.

1 Wang J. H.

1 Wu J. W.

1 2016

1 2005

Wyniki wyszukiwania

Interactions between soil water and fertilizer on leaf photosynthesis and delta13C of Catalpa bungei seedlings

Temporal pattern of the induction of SF-1 gene expression by the signal transduction pathway involving 3',5'-cyclic adenosine monophosphate