Effects of photosynthetic bacteria on growth and photosynthetic function in wheat

Abstract:

[Objective] The effects of photosynthetic bacteria on growth and photosynthetic function of wheat was researched. [Methods] Yaomai16 was employed as the research material of this research. Different kinds of photosynthetic bacteria were spread during different growth phase of wheat in order to investigate the effect of photosynthetic bacteria to the wheat in terms of growth, productivity and photosynthetic function. [Results] Different composition of culture medium of photosynthetic bacteria culture can improve the SPAD value of flag leaves, as well as photosynthetic reaction speed and dry-weight accumulation. After fertilized with photosynthetic bacteria during the elongation phase, the mixed bacteria has the largest promoting effect on the amount of SPAD in leaves, which is 33.6% higher than control groups without treatment of photosynthetic bacteria. Moreover, the dry weight accumulation and the seed weight of individual plant are increased for 25.7% and 14.3% respectively than control groups. Rhodopseudomonas palustris has the largest promoting effect which increases both the dry weight accumulation and the seed weight of individual plant for 13.1% respectively comparing to the diluted medium controls. The results from the treatment at different period indicate that Rhodopseudomonas palustris culture medium has the strongest promoting effect in jointing period and milk filling period. Additionally, the resting cell can extend the functional period of leaves and further continuously increase the photosynthetic product, the culture medium without cells can increase the productivity of wheat through improving the vegetative growth of wheat. [Conclusion] The photosynthetic bacteria can promote the growth and enhance the photosynthetic related function effectively during the developmental process of wheat. Jointing period and milk filling period are suggested to be the two of the best spread period. The increase of growth and productivity of wheat by photosynthetic bacteria is the integrated consequence of interaction between resting cell and active metabolites.