Effects of Salt Stress on the Photosynthetic Physiology and Ions Absorption of Pittosporum pentandrum Seedlings

doi:10.11924/j.issn.1000-6850.casb14110163

Abstract

Abstract: In order to study photosynthetic mechanism of growth reduction of P. pentandrum under salt stress, the author used the method of pot experiment, took 1 year P. pentandrum as material and set salt solutions with the concentration of 0, 6, 9, 12, 15 g/kg. After two months stress, the main photosynthetic parameters, water content, and ions content were determined. Results indicated that Ls, Tr and Gs of P. pentandrum decreased with the increasing concentration of salt, intercellular CO₂ increased slowly, while Pn and WUE decreased slowly. The water content of P. pentandrum root decreased while that of the overground part increased with the concentration increasing. P. pentandrum poisoned by Na and Cl^- seriously under salt stress, Kand Ca² absorption were restricted, the selective absorption ability was limited. In conclusion, the results suggested that the reason of Pn decrease in P. pentandrum under salt stress was non-stomata limitation, namely the photosynthetic activity descent of mesophyll cell. This might be related to seriously ion toxicity.

Huang Yongrong. Effects of Salt Stress on the Photosynthetic Physiology and Ions Absorption of Pittosporum pentandrum Seedlings[J]. Chinese Agricultural Science Bulletin, 2015, 31(10): 27-32.

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