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Comprehensive evaluation of salt-tolerance of maize at mature period using subordinate function value analysis

ZHANG Huili;YUAN Chuang;ZHU Lin;XU Xing;Agricultural College,Ningxia University;Key Laboratory for Restoration and Restruction of Degraded Ecosystem in Northwest China of Ministry of Education,Ningxia University;State Key Laboratory Breeding Base of Land Degradation and Ecological Restoration of Northwest China,Ningxia University;  
【Objective】This study screened the germplasm resources of maize with salt tolerance and salt sensitivity to provide theoretical basis for salt tolerance breeding.【Method】During April to September 2016,10 maize cultivars were planted in saline land(soil total salt content of 2.269 g/kg)and control land(soil total salt content of 0.621 g/kg)in Yinchuan,Ningxia.There was no difference in the soil chemical characters between the two experimental lands.K~+/Na~+ ,photosynthetic physiological exchange parameters including effective light intensity(PAR),net photosynthetic rate(P_n),transpiration rate(Tr),stomatal conductance(Gs)and leaf temperature(T_L),agronomic characters and yield were determined in mature stage.Then,the salt tolerances of the tested genotypes were comprehensively evaluated by principal compo-nent analysis and the subordinate function method.【Result】Compared with control,the K~+/Na~+ of root and basal stem of maize varieties were significantly decreased under saline-alkali stress(P0.05).The K~+/Na~+ ratios in different parts were in the order of stem leafbasal stem root,suggesting the selectiveness for maize in ion uptake and transportation as well as the ability to store Na~+ in root and K~+in stem.Net photosynthetic rate(P_n)was significantly lower under salt-alkali stress treatment than those in control(P0.05),while leaf temperature(T_L)was significantly higher than those in control(P0.01),other photosynthetic indexes had no obvious law.The average agronomic traits and yield were all decreased compared with control.【Conclusion】According to synthetic evaluation value(D),the comprehensive evaluation indicated that the salt-tolerances of the ten maize varieties were in the order of WY_2Ning3/1522A3/A18HoViY1A111-3/H242H237/A18Gui silage 1A3/A18 GaoNorth 21/A58H237/1506.
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