Rice & Low Oxygen

image descriptionRead here a Review article on rice germination in anoxia

Read here a Review article on Sub1A in rice

 

 

 


 Rice fieldRice (Oryza sativa L.) is one of the few plant species that can tolerate prolonged soil flooding or complete submergence thanks to an array of adaptive mechanisms. These include an ability to elongate submerged shoot organs at faster than normal rates and to develop aerenchyma, allowing the efficient internal transport of oxygen from the re-emerged elongated shoot to submerged parts. However, rice seeds are able to germinate anaerobically by means of coleoptile elongation. This cannot be explained in terms of oxygen transport through an emerged shoot. The Perata Lab is active since 1985 on rice research. Although there is still much to learn about the biochemical and molecular  basis of anaerobic rice germination, the ability of rice to maintain an active fermentative metabolism (i.e. by fuelling the glycolytic pathway with readily fermentable carbohydrates) is certainly crucial. The Lab demonstrated that the ability to degrade the seed starchy reserves is crucial for allowing rice germination under anoxia. More recently, the results obtained through microarray-based transcript profiling confirm most of the previous evidence based on single-gene studies and biochemical analysis, and highlight new aspects of the molecular response of the rice coleoptile to anoxia.

image descriptionAdditionally, cross-talk between the anaerobic and sugar signaling pathways contribute to the acclimation mechanisms in rice.

A review summarizes the existing knowledge on rice germination under low-oxygen.

A review on the role of Sub1A in rice tolerance to submergence can be downloaded here.