[Research advance in seed germination of desert woody plants].
This paper reviewed the research methods of desert woody plants seed germination, and the effects of internal and external ecological factors on it. Most researchers use incubator and artificial climate chamber to dispose the seeds, while field investigation was few involved. Seed dormancy is the important physiological factor affecting germination, while seed size, mass and color are closely correlated with its maturity and vigor. The poor permeability of seed capsule is a barrier that restrains the germination, which can be weakened or eliminated by shaving, cutting, treating with low temperature, and dipping in chemical reagent, etc. Seed water content has a close correlation with its storage life and water-absorbing capability. Suitable temperature is the prerequisite of seed germination, while changing temperature can accelerate the germination. Soil moisture content is a limiting factor, while illumination is not so essential to the seed germination of most desert woody plants. Sand-burying plays an important role in the seed germination through regulating illumination, temperature, and soil moisture content. Salinity stress restrains the seed germination of desert woody plants observably. In further studies, the effects of multi-factors and the eco-physiological and molecular biological mechanisms of germination should be more concerned.
Chang
Wei
W
Key Laboratory for Silviculture and Conservation of Education Ministry, Beijing Forestry University, Beijing 100083, China. changwei96ns@126.com
Wu
Jian-guo
JG
Liu
Yan-hong
YH
D002681:China; D003889:Desert Climate; D017753:Ecosystem; D018525:Germination / Q000502:physiology*; D012639:Seeds / Q000502:physiology; D014197:Trees / Q000254:growth & development / Q000502:physiology*