Effect of low-nitrogen stress on photosynthesis and chlorophyll fluorescence characteristi

Effect of low-nitrogen stress on photosynthesis and chlorophyll fluorescence characteristics of maize cultivars with different low-nitrogen

tolerances

WU Ya-wei;LI Qiang;JIN Rong;CHEN Wei;LIU Xiao-Iin;KONG Fan-Iei;KE Yong-pei;SHI Hai-chun;YUAN Ji-chao

【期刊名称】《农业科学学报（英文版）》 【年(卷),期】2024(018)006

【摘要】Nitrogen (N) is a critical element for plant growth and productivity

that

influences

photosynthesis

and

chlorophyll

fluorescence. We investigated the effect of low-N stress on leaf photosynthesis and chlorophyll fluorescence characteristics of maize cultivars with difference in tolerance to low N levels. The low-N tolerant cultivar ZH311 and low-N sensitive cultivar XY508 were used as the test materials. A field experiment (with three N levels: N0, 0 kg ha-1; N1, 150 kg ha-1; N2, 300 kg ha-1) in Jiyanyang, Sichuan Province, China, and a hydroponic experiment (with two N levels: CK, 4 mmol L-1; LN, 0.04 mmol L-1) in Chengdu, Sichuan Province, China were conducted. Low-N stress significantly decreased chlorophyll content and rapid light response curves of the maximum fluorescence under light (Fm'), fluorescence instable state (Fs), non-photochemical quenching (qN), the maximum efficiency of PSII photochemistry under dark-adaption