No abstract

Nitrogen is an essential nutrient for plant growth and basic metabolic processes. Root systems play an important role in the ability of plants to obtain nutrients from the soil, and are closely related to the growth and development of above-ground plants. Root morphology analysis showed that root growth was induced under low-nitrogen conditions and inhibited under high-nitrogen conditions. To better understand the molecular mechanisms and metabolic basis underlying the rice root response to nitrogen availability, an integrated analysis of the rice root transcriptome and metabolome under three environmental conditions (low-, control, and high-nitrogen conditions) was conducted. A total of 262 and 262 differentially level metabolites were identified under low- and high-nitrogen conditions, respectively. A total of 696 and 808 differentially expressed genes were identified under low- and high-nitrogen conditions, respectively. For both the differentially expressed genes and metabolites, KEGG pathway analysis indicated that amino acid metabolism, carbon and nitrogen metabolism, phenylpropanoid metabolism, and phytohormones’ signal transduction were significantly affected by nitrogen availability. Additionally, variable levels of 65 transcription factors (TFs) were identified in rice leaves exposed to high and low nitrogen, covering 22 TF families. These results also indicate that there is a significant difference in the transcriptional regulation mechanisms of rice roots between low and high nitrogen. In summary, our study provides new information for a further understanding of the response of rice roots to low-nitrogen and high-nitrogen conditions.

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We examine the effects of state ownership, institutions and resource-seeking behavior on post-acquisition stock price returns of Chinese cross-border mergers and acquisitions over the period 1998-2008. Chinese acquiring firms experience negative returns ranging from 2.92 to 10.80 % in 12-and 60-month post-event periods, respectively. State ownership (SOE), interaction between R&D and SOE, formal institutional distance and acquirer size have a positive and significant impact on the long-term acquirer returns. However, the interaction between tangible resources and SOE and acquirer cash holdings appears to have a negative and significant impact on long-term returns. Overall, our results suggest that the state and institutions constitute important sources of long-term value creation for Chinese acquirers.