Screening Oat Genotypes for Tolerance to Salinity and Alkalinity

Bai, Jianhui; Yan, Weikai; Wang, Yuqing; Yin, Qiang; Liu, Jinghui; Wight, Charlene P.; Ma, Bao–Luo

doi:10.3389/fpls.2018.01302

Cited by 48 publications

(37 citation statements)

References 44 publications

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“…The reductions of physiological and growth responses to salinity in various N treatments were higher for ND than for SA, indicating a greater tolerance to salinity of genotype SA than of ND. Similar results were also reported as screening 262 oat genotypes for tolerance to salinity and alkalinity [18]. Although SA was more salt tolerant than ND, the performance of physiology, growth, and yield of both genotypes to soil salinity enhanced with the increased N rates, as the mechanism for increasing N rates to alleviate salt stress worked in the same mode of action for both genotypes.…”

Section: Discussionsupporting

confidence: 81%

“…Understanding the interaction between salinity and N fertilization is of a great agronomic and economic importance for crop production [10,20]. Most studies in salinity and nitrogen have focused either on salinity as a limiting factor for crop growth [16,18] or on the N influence on crop growth [17], while their interactive effects are still not fully understood. In our study, we found that the photosynthetic rate, nitrogen use efficiency, plant height, and grain yield were significantly affected by the interaction of salinity stress and N fertilization.…”

Section: Discussionmentioning

confidence: 99%

“…There were 48 pots in total for each run in the study. Two oat genotypes with distinctive differences in salt tolerance [18], 6-SA120097 (salt tolerant, abbreviated as SA) and 153-ND121147 (salt sensitive, abbreviated as ND), were used. Considering the fact that numerous studies have been conducted to investigate the response of oat germination to salinity stress [16,19], the soil salinity (NaCl) treatments were incorporated into the pots at the tillering stage in the study.…”

Section: Experimental Designmentioning

confidence: 99%

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

Song

Zhou

et al. 2019

Agronomy

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: 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−1) 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−1, 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−1) 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.

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Section: Discussionsupporting

confidence: 81%

Section: Discussionmentioning

confidence: 99%

Section: Experimental Designmentioning

confidence: 99%

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

Song

Zhou

et al. 2019

Agronomy

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“…Alkalinity inhibits photosynthesis, stomatal conductance, and transpiration rates more severely than salinity ( Chen et al, 2011 ). Greater limitations on germination rate and yield have been observed under alkali stress than under salt stress in oats ( Bai et al, 2018 ). However, the mechanisms of alkali toxicity are not fully understood.…”

Section: Introductionmentioning

confidence: 99%

Proteomic Responses to Alkali Stress in Oats and the Alleviatory Effects of Exogenous Spermine Application

et al. 2021

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Alkali stress limits plant growth and yield more strongly than salt stress and can lead to the appearance of yellow leaves; however, the reasons remain unclear. In this study, we found that (1) the down-regulation of coproporphyrinogen III oxidase, protoporphyrinogen oxidase, and Pheophorbide a oxygenase in oats under alkali stress contributes to the appearance of yellow leaves (as assessed by proteome and western blot analyses). (2) Some oat proteins that are involved in the antioxidant system, root growth, and jasmonic acid (JA) and indole-3-acetic acid (IAA) synthesis are up-regulated in response to alkalinity and help increase alkali tolerance. (3) We added exogenous spermine to oat plants to improve their alkali tolerance, which resulted in higher chlorophyll contents and plant dry weights than in plants subjected to alkaline stress alone. This was due to up-regulation of chitinase and proteins related to chloroplast structure, root growth, and the antioxidant system. Spermine addition increased sucrose utilization efficiency, and promoted carbohydrate export from leaves to roots to increase energy storage in roots. Spermine addition also increased the IAA and JA contents required for root growth.

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“…Compared with other crops, oat exhibits marked physiological traits when exposed to salinity, and is therefore useful as a study species in examining the physiological responses of cereal crops to sodic-alkalinity, which is more seriously limiting than salinity to agricultural productivity. However, oat genotypes such as Vao-9, Baiyan5, 16SA120850, 153ND121147, 121OA1432-5, and 5SA120093, also differ in their physiological responses to salinity or sodic-alkalinity [ 22 , 23 ]. Yanke1 and Caoyou1 are two lines of naked oats; Yanke1 is an edible oat line bred from 8115-1-2 and Jian1, and Caoyou1 is a grass oat line bred from 578 and Hebo1.…”

Section: Introductionmentioning

confidence: 99%

Differences in Physiological Responses of Two Oat (Avena nuda L.) Lines to Sodic-Alkalinity in the Vegetative Stage

Liu

Petchphankul

Ueda

et al. 2020

Plants

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Sodic-alkalinity is a more seriously limiting factor in agricultural productivity than salinity. Oat (Avena nuda) is a salt-tolerant crop species and is therefore useful in studying the physiological responses of cereals to alkalinity. We evaluated the differential effects of sodic-alkalinity on two naked oat lines, Caoyou1 and Yanke1. Seedlings of the two lines were exposed to 50 mM alkaline salt mixture of NaHCO3 and Na2CO3 (18:1 molar ratio; pH 8.5) for 2 weeks in a soil environment. Sodic-alkalinity exposure led the assimilation of abundant Na+ at similar concentrations in the organs of both lines. However, Caoyou1 showed much stronger growth than Yanke1, exhibiting a higher dry weight, total leaf area, and shoot height under sodic-alkalinity. Further analysis showed that Caoyou1 was more sodic-alkalinity tolerance than Yanke1. This was firstly because of differences in the oxidative stress defense mechanisms in leaves of the two lines. Antioxidant enzyme activities were either slightly elevated (catalase (CAT), ascorbate peroxidase (APX), guaiacol peroxidase (GP), glutathione reductase (GR)) or unaltered (superoxide dismutase (SOD)) in Caoyou1 leaves, but some enzyme (SOD, GPOX, GR) activities were significantly reduced in Yanke1. AnAPX1 transcript levels significantly increased in Caoyou1 under sodic-alkalinity conditions compared with Yanke1, indicating its better antioxidant capacity. Secondly, the related parameters of Mg2+ concentration, phosphoenolpyruvate carboxylase (PEPC) activity, and AnPEPC transcript levels in the leaves showed significantly higher values in Caoyou1 compared with Yanke1. This demonstrated the effective utilization by Caoyou1 of accumulated HCO3− in the irreversible reaction from phosphoenolpyruvate to oxaloacetate to produce inorganic phosphorus, which was elevated in Caoyou1 leaves under alkalinity stress. Overall, the results demonstrated that the greater sodic-alkalinity tolerance of Caoyou1 is the result of: (1) maintained antioxidant enzyme activities; and (2) a higher capacity for the phosphoenolpyruvate to oxaloacetate reactions, as shown by the higher PEPC activity, Mg2+ concentration, and total phosphorus concentration in its leaves, despite the lower soil pH.

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Screening Oat Genotypes for Tolerance to Salinity and Alkalinity

Cited by 48 publications

References 44 publications

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

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

Proteomic Responses to Alkali Stress in Oats and the Alleviatory Effects of Exogenous Spermine Application

Differences in Physiological Responses of Two Oat (Avena nuda L.) Lines to Sodic-Alkalinity in the Vegetative Stage

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