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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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>−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>−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>−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>−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>−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>−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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