The Photosynthesis Mechanism of Tolerant and Sensitive Maize Germplasm Resources Under Salt Tolerance at Seedling Stage

doi:10.11924/j.issn.1000-6850.casb2020-0047

Abstract

Abstract:

The increasing level of soil salinization has gradually become a major environmental factor affecting plant growth and restricting grain yield. In the study, salt tolerant inbred line B46 and salt sensitive inbred line NC236 were selected as experimental materials to analyze the variation of the photosynthesis under salt tolerance at seedling stage. Under low concentration (55 mmol/L NaCl) salt stress, the content of chlorophyll in maize inbred lines increased. The content of chlorophyll in the leaves of B46 increased significantly compared with that of NC236. With the increase of NaCl concentration, the content of chlorophyll in the two maize inbred lines presented a downward trend, and the content decrease of B46 was less than that of NC236. The amplitude change of the maximum photochemical efficiency (Fv/Fm), the potential photochemical efficiency (Fv/Fo), the photochemical quenching coefficient (qP) and the initial fluorescence (Fo) of B46 were small under salt stress compared with that of NC236. While the amplitude change of the non-photochemical quenching coefficient (NPQ) was large. B46 showed stomatal limitation under the NaCl concentration from 0 to 165 mmol/L because of stomatal closure, and had non-stomatal limitation under the NaCl concentration of 220 mmol/L because the photosynthsis system was damaged; NC236 showed stomatal limitation in the NaCl concentration from 0 to 110 mmol/L, and non-stomatal limitation in the NaCl concentration from 165 to 220 mmol/L.

Key words: maize (Zea mays), salt stress, photosynthesis, salt tolerance mechanism

CLC Number:

S513

Wang Mingquan, Fu Lixin, Li Guoliang, Hu Guanghui, Ren Honglei, Hu Shaoxin, Yang Jianfei, Liu Chang, Gong Shichen. The Photosynthesis Mechanism of Tolerant and Sensitive Maize Germplasm Resources Under Salt Tolerance at Seedling Stage[J]. Chinese Agricultural Science Bulletin, 2021, 37(5): 8-14.

Figures/Tables 13

References 31

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