scholarly journals Overexpression of GmAAP6a enhances tolerance to low nitrogen and improves seed nitrogen status by optimizing amino acid partitioning in soybean

2020 ◽  
Vol 18 (8) ◽  
pp. 1749-1762 ◽  
Author(s):  
Sheng Liu ◽  
Dan Wang ◽  
Yuanyuan Mei ◽  
Tongmei Xia ◽  
Wei Xu ◽  
...  
Keyword(s):  
Amino Acid ◽  
Nitrogen Status ◽  
Low Nitrogen

Leaf nitrogen as a guide for fertilising macadamia

1997 ◽  
Vol 37 (5) ◽  
pp. 599 ◽  
Author(s):  
R. A. Stephenson ◽  
E. C. Gallagher ◽  
V. J. Doogan
Keyword(s):  
Nitrogen Nutrition ◽  
Current Trend ◽  
Leaf Nitrogen ◽  
Nitrogen Status ◽  
Oil Accumulation ◽  
Inflorescence Development ◽  
Experimental Block ◽  
High Yields ◽  
The Relationship ◽  
Low Nitrogen

Summary. Despite the lack of evidence for a critical level of leaf nitrogen in macadamia, fertiliser management has been largely based on tentative standards for high yielding trees. Trees on a lower plane of nitrogen nutrition, however, produced higher yields of good quality nuts. This study was therefore carried out to establish the relationship between yield and nitrogen status of trees. Three rates of nitrogen fertiliser (0.5, 1.5 and 2.5 kg urea/tree . year; 230, 690 and 1150 g nitrogen respectively) were applied to macadamia trees in 1 of 5 application strategies: 1 application in April (floral initiation); 2 applications, one in April and one in June (inflorescence development); 3 applications, April, June and November (rapid nut growth and premature nut drop); 4 applications, April, June, November and January (oil accumulation); and 12 monthly split applications. Multiple applications were all equal in size. The association between high yields and low nitrogen status was confirmed. In some, but not all, years, yield was negatively correlated with leaf nitrogen, accounting for 47 and 59% of the variation in yield of commercially acceptable nuts (>19 mm diameter) in 1991 and 1993, respectively. It is therefore recommended that the standard for leaf nitrogen in macadamia be lowered from 1.4–1.5 to 1.3% under Australian conditions. These results raise concerns at the current trend for leaf nitrogen to be as high as 1.8%. It would be prudent to cease nitrogen applications on at least a small experimental block until leaf nitrogen declined to 1.3% and then maintain this level for at least 3 years and monitor yields.

Effects of low nitrogen supply on relationships between photosynthesis and nitrogen status at different leaf position in wheat seedlings

2013 ◽  
Vol 70 (3) ◽  
pp. 257-263 ◽  
Author(s):  
Dandan Li ◽  
Mengyu Tian ◽  
Jian Cai ◽  
Dong Jiang ◽  
Weixing Cao ◽  
...  
Keyword(s):  
Nitrogen Supply ◽  
Leaf Position ◽  
Nitrogen Status ◽  
Wheat Seedlings ◽  
Low Nitrogen

The voluntary intake of silage by sheep:III. The effects of post-ruminal infusions of casein on the intake and nitrogen retention of sheep given silage ad libitum

1971 ◽  
Vol 77 (3) ◽  
pp. 545-547 ◽  
Author(s):  
K. J. Hutchinson ◽  
R. J. Wilkins ◽  
D. F. Osbourn
Keyword(s):  
Nitrogen Content ◽  
Perennial Ryegrass ◽  
Positive Relationship ◽  
Nitrogen Retention ◽  
Nitrogen Status ◽  
Ad Libitum ◽  
Voluntary Intake ◽  
Low Nitrogen

SUMMARYIsocaloric quantities of casein, and glucose were infused into the abomasum and duodenum of sheep given perennial ryegrass silage ad libitum. Casein infusion significantly increased nitrogen retention but failed to affect silage consumption, suggesting that the positive relationship found between silage intake and silage nitrogen content is unlikely to be due to a low nitrogen status in sheep fed all-silage rations.

Leaf analysis survey of Pullar's Cling peach trees in northern Victoria: correlations between leaf nutrient status and tree performance in two years

1972 ◽  
Vol 12 (54) ◽  
pp. 103
Author(s):  
BK Taylor ◽  
Bvan den Ende
Keyword(s):  
Regression Analysis ◽  
Nutrient Status ◽  
Nitrogen Status ◽  
Irrigation Area ◽  
Leaf Analysis ◽  
Nitrogenous Fertilizer ◽  
Fruit Growing ◽  
Peach Trees ◽  
Low Nitrogen ◽  
Tree Performance

The N, P, K, Ca, and Mg contents of mid-shoot leaves of ten-year-old Pullar's Cling peach trees in the Goulburn Valley Irrigation Area, and the associated Murray Valley Irrigation Area were surveyed in 1964 and 1965. Leaves were sampled in mid summer from healthy trees in 73 orchards distributed over five major fruit-growing districts, and the results were related to tree yield (fruit number,) and vigour (butt circumference). Multiple regression analysis of the survey data showed that between 30 and 40 per cent of the total variation in tree yield over the two-year period was accounted for by variation in tree nutrient status. Such results clearly indicate the degree of influence that nutrition can play in the performance of mature peach trees in the field. As judged by published leaf nutrient standards for peach trees, about two-thirds of the peach orchards were of low nitrogen status in both seasons and this situation was reflected in tree yield. The low nitrogen status of the trees overall was a reflection of the low average amounts of nitrogenous fertilizer applied per tree per year. One-fifth of the orchards were of low phosphate status, but tree performance was not adversely affected as a result. In single years also, significant correlations were recorded between leaf K, leaf Ca, and tree performance, but, overall, these results were difficult to interpret meaningfully.

Distribution of 14c Label From Cotton Leaves: Consequences of Changed Water and Nitrogen Status.

1982 ◽  
Vol 9 (6) ◽  
pp. 735 ◽  
Author(s):  
GA Constable ◽  
HM Rawson
Keyword(s):  
Nitrogen Nutrition ◽  
Net Photosynthesis ◽  
Distribution Patterns ◽  
Growth Conditions ◽  
Total Carbon ◽  
Plant Performance ◽  
Regression Coefficients ◽  
Nitrogen Status ◽  
The Relationship ◽  
Low Nitrogen

14CO2 was applied to individual cotton leaves and its distribution after 24 h was examined in plants of varying water and nitrogen status. Redistribution patterns as well as leaf net photosynthesis and leaf expansion patterns were also established. Irrespective of growth conditions, phyllotaxis had a marked effect on distribution patterns. For example, fruit in vertical alignment with the labelled leaf received 2-4 times more label than fruit on the opposite side of the mainstem. Distance of a sink from the labelled source, as measured in number of nodes, was also of major importance in well watered plants, the relationship being logarithmic. However, during water stress or low nitrogen nutrition, proportionally more 14C moved to the roots. Furthermore, if plants were stressed slowly, the lower bolls received a greater share of the label than in well watered plants. Analysis of the distribution patterns indicated that empirical regression coefficients considering both phyllotaxis (angle) and distance between source and sink may be of use in simulations of plant performance. Using these regression coefficients and leaf photosynthesis data collected elsewhere, the distribution of total carbon within the cotton plant was calculated.

Nitrogen variability between ‘Cornice’ pear fruits from trees having high and low nitrogen status

1991 ◽  
Vol 66 (1) ◽  
pp. 43-50 ◽  
Author(s):  
E. E. Sanchez ◽  
T. L. Righetti ◽  
D. Sugar ◽  
P. B. Lombard
Keyword(s):  
Nitrogen Status ◽  
Low Nitrogen
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