数字农科院2.0

Assessing the variation in traits for manganese deficiency tolerance among maize genotypes

文献类型： 外文期刊

作者： Long, Lizhi;Kristensen, Rebekka Kjeldgaard;Guo, Jingxuan;Chen, Fanjun;Pedas, Pai Rosager;Zhang, Guoping;Schjoerring, Jan Kofod;Yuan, Lixing

作者机构：

关键词： Manganese; Genetic variation; Maize (zea maysL.); Metal transporters; Chlorophyll fluorescence; Photosynthesis

期刊名称： ENVIRONMENTAL AND EXPERIMENTAL BOTANY

ISSN： 0098-8472

年卷期： 2021 年 183 卷

页码：

收录情况： JCR（2021版）

摘要： Deficiency of manganese (Mn) is a serious problem reducing crop yields on calcareous and sandy soils throughout the world. In maize, limited knowledge is available on genotypic differences in tolerance to low-Mn supply and the physiological mechanisms underlying this tolerance. In the present study we have evaluated twelve maize genotypes (inbred lines) for their tolerance to Mn deficiency. The evaluation was based on measurements of how low-Mn supply affected shoot biomass, leaf Mn concentrations, maximum quantum efficiency of photosystem II (F-v/F-m), photosynthetic net CO2 assimilation, root length, Mn uptake and root-shoot Mn translocation. Tolerant genotypes were able to maintain optimum F-v/F-m values under a longer period of Mn deficiency with less reduction of foliar Mn concentration and photosynthetic rate, resulting in less reduction of shoot biomass, compared to sensitive genotypes. Efficient root uptake of Mn and root-to-shoot translocation of Mn also contributed to improved tolerance to Mn-deficiency. The metal transport genes YSL, NRAMP, ZIP, CAX and MTP, involved in root Mn uptake, root-to-shoot Mn translocation and vacuolar Mn homeostasis, were more highly expressed in the efficient genotype K22compared to sensitive genotype BY815. With respect to breeding of maize cultivars with improved Mn-efficiency, the time-course of changes in F-v/F-m values in response to Mn-deficiency provides a useful screening index for low-Mn tolerance.

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