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亚磷酸盐处理可提高小麦的根系生物量和养分利用效率。

Phosphite treatment can improve root biomass and nutrition use efficiency in wheat.

作者信息

Mohammed Umar, Davis Jayne, Rossall Steve, Swarup Kamal, Czyzewicz Nathan, Bhosale Rahul, Foulkes John, Murchie Erik H, Swarup Ranjan

机构信息

Division of Plant and Crop Science, School of Biosciences, University of Nottingham, Nottingham, United Kingdom.

Mars Petcare, Melton Mowbray, United Kingdom.

出版信息

Front Plant Sci. 2022 Oct 31;13:1017048. doi: 10.3389/fpls.2022.1017048. eCollection 2022.

DOI:10.3389/fpls.2022.1017048
PMID:36388577
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9662169/
Abstract

Phosphite represents a reduced form of phosphate that belongs to a class of crop growth-promoting chemicals termed biostimulants. Previous research has shown that phosphite application can enhance root growth, but its underlying mechanism, especially during environmental stresses, remains elusive. To uncover this, we undertook a series of morphological and physiological analyses under nutrient, water and heat stresses following a foliar application in wheat. Non-invasive 3D imaging of root system architecture directly in soil using X-ray Computed Tomography revealed that phosphite treatment improves root architectural traits and increased root biomass. Biochemical and physiological assays identified that phosphite treatment significantly increases Nitrate Reductase (NR) activity, leaf photosynthesis and stomatal conductance, suggesting improved Nitrogen and Carbon assimilation, respectively. These differences were more pronounced under heat or drought treatment (photosynthesis and photosystem II stability) and nutrient deficiency (root traits and NR). Overall our results suggest that phosphite treatment improves the ability of plants to tolerate abiotic stresses through improved Nitrogen and Carbon assimilation, combined with improved root growth which may improve biomass and yield.

摘要

亚磷酸盐是磷酸盐的一种还原形式，属于一类被称为生物刺激素的促进作物生长的化学物质。先前的研究表明，施用亚磷酸盐可以促进根系生长，但其潜在机制，尤其是在环境胁迫期间，仍然不清楚。为了揭示这一点，我们在小麦叶面喷施后，在养分、水分和热胁迫下进行了一系列形态学和生理学分析。使用X射线计算机断层扫描直接对土壤中的根系结构进行非侵入性三维成像，结果表明亚磷酸盐处理改善了根系结构特征并增加了根生物量。生化和生理学分析表明，亚磷酸盐处理显著提高了硝酸还原酶（NR）活性、叶片光合作用和气孔导度，分别表明氮和碳同化得到改善。这些差异在热胁迫或干旱处理（光合作用和光系统II稳定性）以及养分缺乏（根系特征和NR）下更为明显。总体而言，我们的结果表明，亚磷酸盐处理通过改善氮和碳同化，以及改善根系生长（这可能提高生物量和产量），提高了植物耐受非生物胁迫的能力。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/edbb/9662169/d9192975f8d7/fpls-13-1017048-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/edbb/9662169/08cfa8dbe6b7/fpls-13-1017048-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/edbb/9662169/dbd344bcf3e2/fpls-13-1017048-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/edbb/9662169/d88de65859dd/fpls-13-1017048-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/edbb/9662169/999f4d0dd1d1/fpls-13-1017048-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/edbb/9662169/9c9c0b41a7f5/fpls-13-1017048-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/edbb/9662169/f32940d09e71/fpls-13-1017048-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/edbb/9662169/e02ad58ab96d/fpls-13-1017048-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/edbb/9662169/d9192975f8d7/fpls-13-1017048-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/edbb/9662169/08cfa8dbe6b7/fpls-13-1017048-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/edbb/9662169/dbd344bcf3e2/fpls-13-1017048-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/edbb/9662169/d88de65859dd/fpls-13-1017048-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/edbb/9662169/999f4d0dd1d1/fpls-13-1017048-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/edbb/9662169/9c9c0b41a7f5/fpls-13-1017048-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/edbb/9662169/f32940d09e71/fpls-13-1017048-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/edbb/9662169/e02ad58ab96d/fpls-13-1017048-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/edbb/9662169/d9192975f8d7/fpls-13-1017048-g008.jpg

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