Abstract
Canola is an important rotation crop in Australia's high-rainfall zone (HRZ), where frequent waterlogging occurs. Due to its lack of aerenchyma, canola is more vulnerable to waterlogging. Recent studies have shown that nitrogen supplementation can benefit crop growth under waterlogging stress. However, limited reports have addressed the physiological responses and macronutrient changes in either winter or spring canola with strategically timed fertilizer applications. This study investigated the physiological and elemental responses of two canola genotypes to nitrogen application at different timings during waterlogging stress. By imposing waterlogging stress in pot-based trials for 21 days using spring-type (Dynatron) and winter-type (Nizza) canola, our results demonstrated that nitrogen application one week prior to the onset of waterlogging marginally improved soil plant analysis development (SPAD) values in the two types of canola, but only significantly enhanced stomatal conductance along with reduced photosynthetic efficiency in Dynatron at the end of waterlogging, indicating genotypic differences. Furthermore, applying fertilizer a week before waterlogging enhanced macronutrient accumulation in Dynatron, including phosphorus, potassium, magnesium, and calcium. In contrast, Nizza only exhibited a significant increase in magnesium accumulation. Fertilizer application had no effect on reducing Mn and Fe accumulation in canola, indicating that Mn and Fe toxicity, typically associated with soil waterlogging, was not a contributing factor in nitrogen-induced waterlogging alleviation. Collectively, our results demonstrated genotype-specific nutrient dynamics, which should be considered in nitrogen-induced waterlogging alleviation.
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Claims 6
Claim · model-written summary
Pre-waterlogging nitrogen marginally improved SPAD in both canola types.
- Taxon
- canola
.jpg?width=60)
Brassica napus var. napuse0 - Treatment
- nitrogen application one week prior to the onset of waterlogginge0
- Outcome
- soil plant analysis development (SPAD) valuese0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“nitrogen application one week prior to the onset of waterlogging marginally improved soil plant analysis development (SPAD) values in the two types of canola”
Claim · model-written summary
Pre-waterlogging nitrogen increased stomatal conductance in Dynatron.
- Taxon
- canolaBrassica napus var. napust0
- Material
- Dynatrone0
- Treatment
- nitrogen application one week prior to the onset of waterlogginge1
- Outcome
- stomatal conductancee0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“only significantly enhanced stomatal conductance along with reduced photosynthetic efficiency in Dynatron at the end of waterlogging”
t0“Winter- and Spring-Type Canola”
e1“nitrogen application one week prior to the onset of waterlogging”
Claim · model-written summary
Pre-waterlogging nitrogen reduced photosynthetic efficiency in Dynatron.
- Taxon
- canolaBrassica napus var. napust0
- Material
- Dynatrone0
- Treatment
- nitrogen application one week prior to the onset of waterlogginge1
- Outcome
- photosynthetic efficiencye0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“only significantly enhanced stomatal conductance along with reduced photosynthetic efficiency in Dynatron at the end of waterlogging”
t0“Winter- and Spring-Type Canola”
e1“nitrogen application one week prior to the onset of waterlogging”
Claim · model-written summary
Pre-waterlogging fertilizer enhanced phosphorus, potassium, magnesium, and calcium accumulation in Dynatron.
- Taxon
- canolaBrassica napus var. napust0
- Material
- Dynatrone0
- Treatment
- applying fertilizer a week before waterlogginge0
- Outcome
- macronutrient accumulation in Dynatron, including phosphorus, potassium, magnesium, and calciume0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“applying fertilizer a week before waterlogging enhanced macronutrient accumulation in Dynatron, including phosphorus, potassium, magnesium, and calcium.”
t0“Winter- and Spring-Type Canola”
Claim · model-written summary
Nizza had increased magnesium accumulation after fertilizer application.
- Taxon
- canolaBrassica napus var. napust0
- Material
- Nizzae0
- Treatment
- Fertilizer applicatione1
- Outcome
- magnesium accumulatione0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nizza only exhibited a significant increase in magnesium accumulation.”
t0“Winter- and Spring-Type Canola”
e1“Fertilizer application had no effect on reducing Mn and Fe accumulation in canola”
Claim · model-written summary
Fertilizer did not reduce Mn or Fe accumulation in canola.
- Taxon
- canolaBrassica napus var. napuse0
- Treatment
- Fertilizer applicatione0
- Outcome
- Mn and Fe accumulatione0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fertilizer application had no effect on reducing Mn and Fe accumulation in canola”
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