[Ammonia volatilization and nitrogen use efficiency in the field of fresh edible maize as affec-ted by different band fertilization depths of controlled-release urea].

A field experiment was conducted to examine the effects of controlled-release urea (CRU) application on ammonia (NH) volatilization, nitrogen (N) use efficiency and fresh ear yield of fresh edible maize. The treatments included one control (CK: no N fertilizer application) and four different band fertilization depths (0, 5, 10, 15 and 20 cm). Results showed that NH volatilization from non-fertilization band and planting band mainly occurred in the first two weeks after the fertilization, which lasted for almost a month in the fertilization band.

A novel Brassica-rhizotron system to unravel the dynamic changes in root system architecture of oilseed rape under phosphorus deficiency.

Background And Aims: An important adaptation of plants to phosphorus (P) deficiency is to alter root system architecture (RSA) to increase P acquisition from the soil, but soil-based observations of RSA are technically challenging, especially in mature plants. The aim of this study was to investigate the root development and RSA of oilseed rape (Brassica napus L.) under low and high soil P conditions during an entire growth cycle.

Analysis of the contribution of acid phosphatase to P efficiency in Brassica napus under low phosphorus conditions.

To understand whether genotypic variation in acid phosphatase (APase) activity in rapeseed (Brassica napus L.) induced by phosphorus (P) deficiency has impact on P efficiency, soil APase activity in the rhizosphere for rapeseed P-efficient genotype 102 and P-inefficient genotype 105 was measured against organic and inorganic P sources in the pot experiment, and the activities of root-secreted APase and leaf intracellular APase were investigated in different P-starvation periods in the nutrient solution. Higher activity of root-secreted APase in B.

[Effects of soil moisture and boron supply on the plant growth and leaf water content and boron forms of oilseed rape cultivars with different boron use efficiency at their seedling stage].

The study with pot experiment showed that under the stress of low soil moisture content, the oilseed rape cultivars with high and low boron (B) use efficiency had a higher fresh mass per plant at their seedling stage under high B supply, compared with those under low B supply. The increment was 43.1% and 31.

[How long the way from QTL to QTGS?].

Most of the important economic traits in higher plants are quantitative traits. Genetic basic researches for quantitative traits were strongly promoted. This article fully elaborated the complicated relationship between quantitative phenotype and its genotype, introduced the recently developed strategy of fine mapping.

[Integration of DNA clones related to important economic traits of Brassica napus onto Arabidopsis genetic map].

Arbidopsis thaliana and Brassica oilcrops are closely related species in Brassicae, Cruciferae, and show highly homologous genomes. After a serial important agronomic characteristics of Brassica napus being mapped with probes from EST clones of Arabidopsis and DNA clones of rapeseed, DNA segment sequencing was performed with 25 clones which were found to be closely linked to the CMS restore gene, the boron efficiency gene (BE1), the Sclerotinia resistant QTLs and the characteristic of interspecific biomass heterosis in rapeseed respectively. Highly homologous sequences were found in Arabidopsis genome by searching the relative databases.