Nitrogen Application Improved Photosynthetic Productivity, Chlorophyll Fluorescence, Yield and Yield Components of Two Oat Genotypes under Saline Conditions

<b>:</b><b> </b>Understanding the interaction between salinity and nitrogen (N) nutrition is of great economic importance to improve plant growth and grain yield for oat plants. The objective of this study was to investigate whether N application could alleviate the negative...

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Main Authors: Xudong Song, Guisheng Zhou, Bao-Luo Ma, Wei Wu, Irshad Ahmad, Guanglong Zhu, Weikai Yan, Xiurong Jiao
Format: Article
Language:English
Published: MDPI AG 2019-02-01
Series:Agronomy
Subjects:
oat
Online Access:https://www.mdpi.com/2073-4395/9/3/115
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spelling doaj-31347f6285b14906abcc082a6259fe2f2021-04-02T01:19:28ZengMDPI AGAgronomy2073-43952019-02-019311510.3390/agronomy9030115agronomy9030115Nitrogen Application Improved Photosynthetic Productivity, Chlorophyll Fluorescence, Yield and Yield Components of Two Oat Genotypes under Saline ConditionsXudong Song0Guisheng Zhou1Bao-Luo Ma2Wei Wu3Irshad Ahmad4Guanglong Zhu5Weikai Yan6Xiurong Jiao7Joint International Research Laboratory of Agriculture and Agri-Product Safety of Ministry of Education, Yangzhou University, Yangzhou, Jiangsu, 225009, ChinaJoint International Research Laboratory of Agriculture and Agri-Product Safety of Ministry of Education, Yangzhou University, Yangzhou, Jiangsu, 225009, ChinaOttawa Research and Development Centre, Agriculture and Agri-Food Canada, Ottawa, ON, K1A 0C6, CanadaOttawa Research and Development Centre, Agriculture and Agri-Food Canada, Ottawa, ON, K1A 0C6, CanadaJoint International Research Laboratory of Agriculture and Agri-Product Safety of Ministry of Education, Yangzhou University, Yangzhou, Jiangsu, 225009, ChinaJoint International Research Laboratory of Agriculture and Agri-Product Safety of Ministry of Education, Yangzhou University, Yangzhou, Jiangsu, 225009, ChinaOttawa Research and Development Centre, Agriculture and Agri-Food Canada, Ottawa, ON, K1A 0C6, CanadaJoint International Research Laboratory of Agriculture and Agri-Product Safety of Ministry of Education, Yangzhou University, Yangzhou, Jiangsu, 225009, China<b>:</b><b> </b>Understanding the interaction between salinity and nitrogen (N) nutrition is of great economic importance to improve plant growth and grain yield for oat plants. The objective of this study was to investigate whether N application could alleviate the negative effect of salinity (NaCl) stress on oat physiological parameters and yield performance. Two oat genotypes with contrasting salt tolerance response (6-SA120097, a salt-tolerant genotype SA and 153-ND121147, salt-sensitive ND) were grown under four N rates (0, 100, 200, and 400 mg N pot<sup>&#8722;1</sup>) in non-saline and saline (100 mM NaCl) conditions. The results showed that salinity, N fertilization and their interaction significantly affected the photosynthetic rate, transpiration rate, agronomic nitrogen use efficiency (aNUE), physiological nitrogen efficiency (pNUE) and apparent nitrogen recovery (ANR), seed number, and grain yield. Saline stress reduced gas exchange rate, nitrogen use efficiency (NUE), grain yield, and yield components. N fertilization increased photosynthetic productivity and chlorophyll fluorescence, resulting in improved grain yields and yield components for both genotypes. On average, the photosynthetic rate was increased by 38.7%, 74.1%, and 98.8% for SA and by 49.8%, 77.6%, and 110% for ND, respectively, under the N rates of 100, 200, and 400 mg N pot<sup>&#8722;1</sup>, as compared with non-fertilized treatment. In addition, grain yield was increased by 80.6% for genotype SA and 88.7% for genotype ND under higher N application rate (200 mg N pot<sup>&#8722;1</sup>) in comparison with the non-nitrogen treatment. Our experimental results showed that an increase of N supply can alleviate the negative effects induced by salinity stress and improved plant growth and yield by maintaining the integrity of the photosynthesis and chlorophyll fluorescence processes of oat plants, which provides a valuable agronomic strategy for improving oat production in salt-affected soils.https://www.mdpi.com/2073-4395/9/3/115oatnitrogen fertilizationsalt stressphotosynthesischlorophyll fluorescence
collection DOAJ
language English
format Article
sources DOAJ
author Xudong Song
Guisheng Zhou
Bao-Luo Ma
Wei Wu
Irshad Ahmad
Guanglong Zhu
Weikai Yan
Xiurong Jiao
spellingShingle Xudong Song
Guisheng Zhou
Bao-Luo Ma
Wei Wu
Irshad Ahmad
Guanglong Zhu
Weikai Yan
Xiurong Jiao
Nitrogen Application Improved Photosynthetic Productivity, Chlorophyll Fluorescence, Yield and Yield Components of Two Oat Genotypes under Saline Conditions
Agronomy
oat
nitrogen fertilization
salt stress
photosynthesis
chlorophyll fluorescence
author_facet Xudong Song
Guisheng Zhou
Bao-Luo Ma
Wei Wu
Irshad Ahmad
Guanglong Zhu
Weikai Yan
Xiurong Jiao
author_sort Xudong Song
title Nitrogen Application Improved Photosynthetic Productivity, Chlorophyll Fluorescence, Yield and Yield Components of Two Oat Genotypes under Saline Conditions
title_short Nitrogen Application Improved Photosynthetic Productivity, Chlorophyll Fluorescence, Yield and Yield Components of Two Oat Genotypes under Saline Conditions
title_full Nitrogen Application Improved Photosynthetic Productivity, Chlorophyll Fluorescence, Yield and Yield Components of Two Oat Genotypes under Saline Conditions
title_fullStr Nitrogen Application Improved Photosynthetic Productivity, Chlorophyll Fluorescence, Yield and Yield Components of Two Oat Genotypes under Saline Conditions
title_full_unstemmed Nitrogen Application Improved Photosynthetic Productivity, Chlorophyll Fluorescence, Yield and Yield Components of Two Oat Genotypes under Saline Conditions
title_sort nitrogen application improved photosynthetic productivity, chlorophyll fluorescence, yield and yield components of two oat genotypes under saline conditions
publisher MDPI AG
series Agronomy
issn 2073-4395
publishDate 2019-02-01
description <b>:</b><b> </b>Understanding the interaction between salinity and nitrogen (N) nutrition is of great economic importance to improve plant growth and grain yield for oat plants. The objective of this study was to investigate whether N application could alleviate the negative effect of salinity (NaCl) stress on oat physiological parameters and yield performance. Two oat genotypes with contrasting salt tolerance response (6-SA120097, a salt-tolerant genotype SA and 153-ND121147, salt-sensitive ND) were grown under four N rates (0, 100, 200, and 400 mg N pot<sup>&#8722;1</sup>) in non-saline and saline (100 mM NaCl) conditions. The results showed that salinity, N fertilization and their interaction significantly affected the photosynthetic rate, transpiration rate, agronomic nitrogen use efficiency (aNUE), physiological nitrogen efficiency (pNUE) and apparent nitrogen recovery (ANR), seed number, and grain yield. Saline stress reduced gas exchange rate, nitrogen use efficiency (NUE), grain yield, and yield components. N fertilization increased photosynthetic productivity and chlorophyll fluorescence, resulting in improved grain yields and yield components for both genotypes. On average, the photosynthetic rate was increased by 38.7%, 74.1%, and 98.8% for SA and by 49.8%, 77.6%, and 110% for ND, respectively, under the N rates of 100, 200, and 400 mg N pot<sup>&#8722;1</sup>, as compared with non-fertilized treatment. In addition, grain yield was increased by 80.6% for genotype SA and 88.7% for genotype ND under higher N application rate (200 mg N pot<sup>&#8722;1</sup>) in comparison with the non-nitrogen treatment. Our experimental results showed that an increase of N supply can alleviate the negative effects induced by salinity stress and improved plant growth and yield by maintaining the integrity of the photosynthesis and chlorophyll fluorescence processes of oat plants, which provides a valuable agronomic strategy for improving oat production in salt-affected soils.
topic oat
nitrogen fertilization
salt stress
photosynthesis
chlorophyll fluorescence
url https://www.mdpi.com/2073-4395/9/3/115
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