Foliar spray of calcium helps improving peanut photosynthesis under low night temperature stress

• 1、College of Land and Environment, Shenyang Agricultural University

Abstract：Peanut chilling damage is widespread around the world. Night chilling damage lead to peanut subsequent photosynthetic barriers, recovery growth slow, which seriously affect the yield and quality of peanut. To cold-sensitive peanut cultivar ‘Fenghua 1’ as experimental materials, used the appropriate concentration of Ca2+ and Ca2+ inhibitors (EGTA, TFP) selected from preliminary test to regulate the cold adaptation of peanut. Mainly studied PSII photoinhibition, photochemical activity and allocation of absorb light, response to Ca2+ and Ca2+ inhibitors in leaves of peanut seedlings under low night temperature stress and the recovery process. The results indicated that low night temperature stress increased the excitation energy of PSII reaction center, inhibited electron transfer, excitation energy distribution between the two light systems imbalanced and reduced the photochemical efficiency. And in the process of absorbed light, the ratio of antenna heat dissipation increased, assigned to the photochemical reaction was reduced and photochemical rate declined. Foliar spray of calcium can effectively reverse the low night temperature stress on the negative influence of photosynthesis. Specific performance in Ca2+ adjust the PSII activity by the way such as increasing the electron transfer rate, improve the photochemical quenching, and repair damage to the photosynthetic membrane to alleviate the low night temperature photosynthesis barriers of peanut. By spraying Ca2+ inhibitors (EGTA, TFP) increase low night temperature stress on the negative impact of the peanut photosynthesis, this illustrates that as the receptor of Ca2+, CAM(Ca2+-modulin) played an important role in the process of Ca2+ alleviate the nutrition signaling of peanut photosynthesis barriers under low night temperature.

Keywords： Calcium nutrition Peanut Low temperature stress Photosynthesis