Research status and prospect of ratoon rice in China under mechanically harvested condition.

The proportion and area of ratoon rice planting in China have been substantially increased, due to continuous improvement of rice breeding methods and consecutive innovation of cultivation technology, which has developed into one of rice planting modes with significant production efficiency. Combining the experience in research and practice, from the perspective of crop physiology and ecology, we reviewed the current situation and prospects of high-yielding formation and physiological mechanisms of ratoon rice. We focused on four key aspects: screening and breeding of ratoon rice cultivars and the classification; suitable stubble height for mechanically harvested ratoon rice, as well as water and fertilizer management; dry matter production and allocation in ratoon rice and the relationship with yield formation; regenerative activity and vigor of ratoon rice roots and their relationship with rhizosphere micro-ecological characteristics.

Physiological and Proteomic Analyses of Different Ecotypes of Reed () in Adaption to Natural Drought and Salinity.

Drought and salinity are the two major abiotic stresses constraining the crop yield worldwide. Both of them trigger cellular dehydration and cause osmotic stress which leads to cytosolic and vacuolar volume reduction. However, whether plants share a similar tolerance mechanism in response to these two stresses under natural conditions has seldom been comparatively reported.

[Effects of Low-level Nutrition and Trace Antibiotics on the Fitness Cost of Plasmids Bearing Antibiotic Resistance].

The effects of nutrition and antibiotic level on fitness costs of plasmid containing antibiotic resistance in drinking water system were investigated in this study. Three plasmids harboring different antibiotic resistances, i.e.

[An analysis of genetic diversity of different ecotypes of reed (Phragmites communis Trin.) by molecular marker techniques].

ISSR (inter-simple sequence repeat) and RAPD (random-amplified polymorphic DNA) markers were used to detect genetic diversity of 4 different ecotypes of reed (Phragmites communis Trin.) growing in Hexi Corridor, Gansu province. Nine effective primers were screened from 30 ISSR arbitrary primers, and a total of 99 DNA bands were amplified, among which 51 (51.