Journal of Plant Growth Regulation ( IF 3.9 ) Pub Date : 2021-08-03 , DOI: 10.1007/s00344-021-10462-8 Meng-Jun Tang 1 , Fan Lu 1 , Yang Yang 1 , Kai Sun 1 , Qiang Zhu 1 , Fang-Ji Xu 1 , Wei Zhang 1 , Chuan-Chao Dai 1
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The deficiency of N-P availability in soil is a primary cause for crop yield and nutrient loss. Since plant-beneficial microbial symbiosis is an eco-friendly method for compensating this negative effect, understanding the interconnection between endophytic fungus colonization and mineral nutrient accumulation in edible parts of crop is important in agricultural production. In this study, we focused on the effects of endophytic fungus Phomopsis liquidambaris on the absorption and distribution of 14 essential mineral elements in vegetative organs (root and shoot) and reproductive organs (grain) of rice during its growing period with reduced N-P fertilizer application, as well as the changes in yield, quality, and mineral nutrition of rice grains. The possible mechanisms including the transcriptional level of the transport-related genes and the structure of endophytic community were also investigated. The results indicated that the P. liquidambaris significantly increased the accumulation of N, P, Fe, Mn, Zn, Mo, and Se in rice grains by 20.5%, 18.9%, 18.2%, 9.5%, 17.9%, 13.3%, and 17.1%, respectively, accompanied by the significant increase in yield (23.8%) and protein content (17.3%). These beneficial effects were attributed to the enhancement formation of iron plaque, the upregulation of nutrient transporters genes, and the altered endophyte community by P. liquidambaris symbiosis. In conclusion, P. liquidambaris could promote the partition of nutrients to the grains by increasing the efficiency of nutrient uptake and remobilization. Our results suggest P. liquidambaris symbiosis as a useful candidate for improving the mineral nutrition, quality, and yield of rice grains under N-P-deficient field condition.
Graphic Abstract
中文翻译：
低氮磷条件下接种内生真菌甘草拟茎点对提高水稻籽粒矿物质营养、品质和产量的益处
土壤中NP可用性的不足是作物产量和养分流失的主要原因。由于有益于植物的微生物共生是一种补偿这种负面影响的生态友好方法，因此了解内生真菌定植与作物可食用部分矿物养分积累之间的相互关系在农业生产中很重要。在这项研究中，我们重点研究了内生真菌Phomopsis liquidambaris减少氮肥施用对水稻生长期间营养器官（根和芽）和生殖器官（籽粒）14种必需矿质元素的吸收和分配，以及产量、品质和矿质营养的变化米粒。还研究了可能的机制，包括转运相关基因的转录水平和内生群落的结构。结果表明，P.liquidambaris显着增加水稻籽粒中 N、P、Fe、Mn、Zn、Mo 和 Se 的积累量，分别增加了 20.5%、18.9%、18.2%、9.5%、17.9%、13.3% 和 17.1%。产量（23.8%）和蛋白质含量（17.3%）显着增加。这些有益作用归因于铁斑块形成的增强、营养转运蛋白基因的上调以及P.liquidambaris共生所改变的内生菌群落。总之，P.liquidambaris可以通过提高养分吸收和再动员的效率来促进养分向谷物的分配。我们的结果表明P.liquidambaris 共生是在 NP 缺乏的田间条件下改善稻米矿质营养、质量和产量的有用候选者。
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