Influences of Water Stress on Citrus Photosynthesis Characteristic and Cell Ultra-structure

The influences of water stress on citrus photosynthesis charateristic and cell ultra-structure were systematically studied by using P.trifoliata(L)Raf.and C.sinensis S.as materials.The results showed that the water stress significantly affected net photosynthetic rate(Pn),the transpiration rate(Tr) and stoma cond(Gc) and damaged root,leaf and chloroplast ultra-structure.The damaged degree of ultra-structure was increased by water stress.Under water stress,photosynthesis turned out to be restrained as a result of the cooperation of stoma and non-stoma mechanism;when photosynthesis decreased sharply and the cells were damaged seriously,it was the critical time to irrigate in citrus production.