Classification of rice II
Marshy field rice and dry land rice
Marshy field rice is planted in watery land, while dry land rice is planted in the dry land. There is little difference between these two rice in Morphology, but big differences in physiology. Both rice has the ventilation organization. But the germination of dry land rice need less water, which has the strong water absorption ability, and it sprouts faster. The stem and leaf protection organization of dry land rice is well developed. It has strong heat resistant capability; its root system is developed, root hair is rich, it has good adaptability to water reduction. Dry land rice can be planted is dry land, as well in the watery field. Some species can be both planted in dry and watery land. But usually the yield of dry land rice is low and gradually replaced by marshy field rice.
Non-glutinous rice and glutinous rice
Non-glutinous rice is the main food in China. Glutinous rice is mainly used to make pastry or wine. The main difference in both rice is the sticky strength. Glutinous rice is very sticky while the non-glutinous rice is less sticky. The viscous strength is mainly determined by the starch structure. The starch structure of glutinous rice is main asamylopectin while the amylose content in non-glutinous rice is more. When the starch is dissolved in iodine solution, due to the strong iodine absorption of non-glutinous rice, the starch turn into blue; while starch become brown for the less absorption of glutinous rice. Generally glutinous rice has better cold and dry tolerance ability than non-glutinous rice.