Responses of PS Ⅱ Function in Leaves of Morus alba Seedlings to Nitrogen Form

doi:10.7668/hbnxb.2017.02.025

Abstract

Abstract: In order to determine the photosynthetic capacity and requirement of mulberry for different nitrogen forms,one year old of mulberry seedlings as experimental materials,the chlorophyll fluorescence characteristics of mulberry leaves was studied under three nitrogen forms,in which nitrogen concentration was 7.5 mmol/L with nitrate nitrogen (NO₃^--N),ammonium nitrogen (NH₄⁺-N)and ammonium nitrate (NH₄NO₃).The results showed that the photochemical activity,electron transfer rate and light energy utilization of mulberry leaves in PS Ⅱ under NH₄⁺-N were significantly lower than that of NH₄NO₃ and NO₃^--N,while there was no significant differences between NH₄NO₃ and NO₃^--N.The V_J and V_I of mulberry leaves were significantly increased by NH₄⁺-N treatment,that was,Q_A to Q_B electronic transmission rate of PS Ⅱ electronic receptor side were lower.while,the S_m and N were significantly higher than those of NH₄NO₃ and NO₃^--N,which showed that the lower the electron transfer ability of PS Ⅱcould be related with capacity of receptor side of Q_B treated by NH₄⁺-N.In addition,V_K and V_L of mulberry leaf under NH₄⁺-N treatment was also lower than that of NO₃^--N and NH₄NO₃,which suggested that the suppressed OEC activity and decreased thylakoid membrane structure stability were the important reasons for reducing photochemical activity in the leaves of PS Ⅱ reaction centers under the NH₄⁺-N treatment.

Key words: Mulberry, Nitrogen form, Chlorophyll fluorescence characteristics, PS Ⅱ

CLC Number:

GU Siyu, YANG Yan, CAI Yuetong, GUO Xingjun, YU Xuewei, ZHU Yuwei, ZHANG Yihe, LI Yue, ZHANG Huihui. Responses of PS Ⅱ Function in Leaves of Morus alba Seedlings to Nitrogen Form[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2017, 32(2): 164-170. doi: 10.7668/hbnxb.2017.02.025.

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