Study On Photosynthesis Physiology Characteristics Of Jatropha Curcas L And Use Section Techlology To Study The Jatropha Curcas L.'s Fruite Development

Jatropha curcas L., a member of the family Euphorbiaceae, which is resistant to drought, poverty, diseases and pests. Jatropha curcas L. is mainly found in tropical and subtropical regions, and in China, it is widely distributed in Guangdong and Guangxi, Hainan, Yunnan, Guizhou, Sichuan et. al. Herbalist doctor believed its medicine is cold, and can be used to scatter silt, relieve pain. It can also heal wounds and stop itching. Some even use it as the treatment of gastroenteritis. Recent years, some studies have found that such plants have significant anticancer activity. It has potential value in the oil industry, and biological pest control and the development of new drugs, while this hot-dry valley is a good species for afforestation of barren hills. Therefore it is a comprehensive utilization of high-value plant resources, and will widely exploited soon. In this paper,â… analyse the relationship between the diurnal variation of net photosynthetic rate and the environmental factors of Jatropha curcas L.'s leaves, and research on the development of the fruitlet of Jatropha curcas L.'s leaves by the technology of paraffin sections and frozen section. We try to estabilsh the rheoretical foundation of the develoPment of the resources of Jatropha curcas L..This paper analysed the relationship between the diurnal variation of net photosynthetic rate and the environmental factors of Jatropha curcas L.'s leaves, aiming to supply reference to the exploitation and the ultilization of Jatropha curcas L. resources. The results showed that net photosynthetic rate of Jatropha curcas L. present a typical double-peak curve. The max net photosynthetic rate was 14.4μmol CO₂·m^-2·S^-1 and the light compensation point was 45μmol·m^-2·S^-1. The main photosynthetic peak appeared at 11:00, and the subaltern peak appeared at 15:30. Among the main peak there was a high efficiency photosynthesis phase (9.8～14.4μmol CO₂·m^-2·S^-1)last 4.5h, which was the most important stage of production accumulation. Date indicated a remarkable noon depression of photosynthetic which was mainly resulted from stomata constraint. Jatropha curcas L. has a high light using rate with the max 3.52%. Study showed the Jatropha curcas L., as a drought-tolerant plant, can limit transpiration in high temperature and high radiation by effectively reducing the role of stomatal conductance, suitable for planting in the dry areas with abundant illumination.