scholarly journals Nitrogen Metabolism in Adaptation of Photosynthesis to Water Stress in Rice Grown under Different Nitrogen Levels

2017 ◽  
Vol 8 ◽  
Author(s):  
Chu Zhong ◽  
Xiaochuang Cao ◽  
Jijie Hu ◽  
Lianfeng Zhu ◽  
Junhua Zhang ◽  
...  
Keyword(s):  
Water Stress ◽  
Nitrogen Metabolism ◽  
Nitrogen Levels

Effect of water stress on some enzymes of nitrogen metabolism in pigeonpea

1981 ◽  
Vol 20 (12) ◽  
pp. 2675-2677 ◽  
Author(s):  
I.S. Sheoran ◽  
Y.P. Luthra ◽  
M.S. Kuhad ◽  
Randhir Singh
Keyword(s):  
Water Stress ◽  
Nitrogen Metabolism ◽  
Effect Of Water

Responses of two hybrid Populus clones to flooding, drought, and nitrogen availability. I. Morphology and growth

1992 ◽  
Vol 70 (11) ◽  
pp. 2265-2270 ◽  
Author(s):  
Zhijun Liu ◽  
Donald I. Dickmann
Keyword(s):  
Soil Moisture ◽  
Water Stress ◽  
Nitrogen Availability ◽  
Carbon Allocation ◽  
Hybrid Poplar ◽  
Leaf Expansion ◽  
Root Production ◽  
Leaf Initiation ◽  
Stem Biomass ◽  
Nitrogen Levels

Repeated progressive drought and flooding stress were imposed on hybrid poplar clones Populus × euramericana 'Eugenei', and Populus tristis × Populus balsamifera ‘Tristis’ grown in pots in a greenhouse under two nitrogen levels. In both clones the rate of leaf initiation was promoted only in high-N plants subjected to minimum water stress. Water stress alone did not retard the rate of leaf initiation, but it significantly reduced leaf expansion of 'Eugenei', whereas only flooding led to smaller leaves in 'Tristis'. The addition of N stimulated leaf expansion, leaf chlorophyll and N concentrations, and leaf and stem biomass production across soil moisture levels, but the greatest effect of N was associated with minimum water stress. High N altered carbon allocation towards the aboveground portions, leading to lower root to shoot ratios. High N also appeared to stimulate initiation of fine roots. Soil moisture determined the amount of biomass that accumulated in roots, with highest root production in well-watered pots and lowest in flooded pots, with the droughted treatment in between. Leaves became thinner as soil moisture decreased from flooding. Stem biomass of 'Tristis' declined more under flooding than under drought, whereas 'Eugenei' displayed a greater reduction of stem biomass in droughty than in flooded soil. Key words: water stress, nitrogen, leaf and root morphology, root to shoot ratio, biomass, Populus, flooding.

Associations between host-plant nitrogen and infestations of the sugarcane borer, Eldana saccharina Walker (Lepidoptera: Pyralidae)

1989 ◽  
Vol 79 (3) ◽  
pp. 489-506 ◽  
Author(s):  
P. R. Atkinson ◽  
K. J. Nuss
Keyword(s):  
Water Stress ◽  
Field Trials ◽  
Eldana Saccharina ◽  
Plant Nitrogen ◽  
Feeding Sites ◽  
Nitrogen Levels ◽  
Natural Hosts ◽  
Cane Weight ◽  
Lepidoptera Pyralidae ◽  
Plant Trials

AbstractInfestations of Eldana saccharina Walker in South Africa are higher in intensively-grown than in peasant-grown sugarcane, and are worse in water-stressed plants. Although field trials showed negligible increases in the incidence of the pest with applied nitrogen, the degree in which the degree of water stress could not be controlled. Pot-plant trials, in which the degree of water stress was controlled as well as the amount of fertilizer, showed that the combination of nitrogen with stress resulted in increased survival of larvae and greatly increased biomass with shortened development times. Adults did not appear to choose stressed or fertilized plants in preference to normal or unfertilized ones. In every case, whether in the field or in insectary trials, increased infestation levels were associated with increased stalk total nitrogen. Amino acid determinations showed that the balance of individual acids did not appear to alter but that the balance of individual acids did not appear to alter but that glyphosate ripener had a similar effect to water stress, increasing all amino acids together. Infestations in older cane were disproportionately higher than in younger cane, weight for weight, despite reduced levels of stalk nitrogen. This anomaly may be due to the presence of phenolic compounds in younger cane, or in cane tops. Levels of nitrogen are much higher in the feeding sites of the insect in natural host-plants than in cane stalks, and the fecundity of feral moths natural hosts appeared to be higher than that of moths from sugarcane. The insect appears to have invaded sugarcane when stalk nitrogen levels reached sufficiently high levels for its survival as a result of intensive cultivation.

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