scholarly journals Yield Response of Uniculm Wheat (Triticum aestivum L.) to Early and Late Application of Nitrogen: Flag Leaf Development and Senescence

2011 ◽  
Vol 3 (1) ◽  
Author(s):  
Santosh Kumari
Keyword(s):  
Triticum Aestivum ◽  
Leaf Development ◽  
Flag Leaf ◽  
Triticum Aestivum L ◽  
Yield Response ◽  
Late Application

Modelling photosynthesis in flag leaves of winter wheat (Triticum aestivum) considering the variation in photosynthesis parameters during development

2015 ◽  
Vol 42 (11) ◽  
pp. 1036 ◽  
Author(s):  
Jingsong Sun ◽  
Jindong Sun ◽  
Zhaozhong Feng
Keyword(s):  
Triticum Aestivum ◽  
Winter Wheat ◽  
Leaf Development ◽  
Flag Leaf ◽  
Seasonal Fluctuation ◽  
Triticum Aestivum L ◽  
Growth Conditions ◽  
Seasonal Patterns ◽  
Flag Leaves ◽  
Parameter Values

The Farquhar–von Caemmerer–Berry (FvCB) model of photosynthesis has been widely used to estimate the photosynthetic C flux of plants under different growth conditions. However, the seasonal fluctuation of some photosynthesis parameters (e.g. the maximum carboxylation rate of Rubisco (Vcmax), the maximum electron transport rate (Jmax) and internal mesophyll conductance to CO2 transport (gm)) is not considered in the FvCB model. In this study, we investigated the patterns of the FvCB parameters during flag leaf development based on measured photosynthesis–intercellular CO2 curves in two cultivars of winter wheat (Triticum aestivum L.). Parameterised seasonal patterns of photosynthesis parameters in the FvCB model have subsequently been applied in order to predict the photosynthesis of flag leaves. The results indicate that the Gaussian curve characterises the dynamic patterns of Vcmax, Jmax and gm well. Compared with the model with fixed photosynthesis parameter values, updating the FvCB model by considering seasonal changes in Vcmax and Jmax during flag leaf development slightly improved predictions of photosynthesis. However, if the updated FvCB model incorporated the seasonal patterns of Vcmax and Jmax, and also of gm, predictions of photosynthesis was improved a lot, matching well with the measurements (R2 = 0.87, P < 0.0001). This suggests that the dynamics of photosynthesis parameters, particularly gm, play an important role in estimating the photosynthesis rate of winter wheat.

EFFECTS OF INCREMENTAL N FERTILIZATION ON GRAIN YIELD AND DRY MATTER ACCUMULATION OF SIX SPRING WHEAT (Triticum aestivum L.) CULTIVARS IN SOUTHERN MANITOBA

1990 ◽  
Vol 70 (1) ◽  
pp. 51-60 ◽  
Author(s):  
D. T. GEHL ◽  
L. D. BAILEY ◽  
C. A. GRANT ◽  
J. M. SADLER
Keyword(s):  
Triticum Aestivum ◽  
Grain Yield ◽  
Spring Wheat ◽  
Dry Matter ◽  
Root Zone ◽  
Temporal Distribution ◽  
Triticum Aestivum L ◽  
N Fertilization ◽  
Yield Response ◽  
Dry Matter Accumulation

A 3-yr study was conducted on three Orthic Black Chernozemic soils to determine the effects of incremental N fertilization on grain yield and dry matter accumulation and distribution of six spring wheat (Triticum aestivum L.) cultivars. Urea (46–0–0) was sidebanded at seeding in 40 kg N ha−1 increments from 0 to 240 kg ha−1 in the first year and from 0 to 200 kg ha−1 in the 2 subsequent years. Nitrogen fertilization increased the grain and straw yields of all cultivars in each experiment. The predominant factor affecting the N response and harvest index of each cultivar was available moisture. At two of the three sites, 91% of the interexperiment variability in mean maximum grain yield was explained by variation in root zone moisture at seeding. Mean maximum total dry matter varied by less than 12% among cultivars, but mean maximum grain yield varied by more than 30%. Three semidwarf cultivars, HY 320, Marshall and Solar, had consistently higher grain yield and grain yield response to N than Glenlea and Katepwa, two standard height cultivars, and Len, a semidwarf. The mean maximum grain yield of HY 320 was the highest of the cultivars on test and those of Katepwa and Len the lowest. Len produced the least straw and total dry matter. The level of N fertilization at maximum grain yield varied among cultivars, sites and years. Marshall and Solar required the highest and Len the lowest N rates to achieve maximum grain yield. The year-to-year variation in rates of N fertilization needed to produce maximum grain yield on a specific soil type revealed the limitations of N fertility recommendations based on "average" amounts and temporal distribution of available moisture.Key words: Wheat (spring), N response, standard height, semidwarf, grain yield

Fine mapping TaFLW1, a major QTL controlling flag leaf width in bread wheat (Triticum aestivum L.)

2013 ◽  
Vol 126 (8) ◽  
pp. 1941-1949 ◽  
Author(s):  
Shulin Xue ◽  
Feng Xu ◽  
Guoqiang Li ◽  
Yan Zhou ◽  
Musen Lin ◽  
...  
Keyword(s):  
Triticum Aestivum ◽  
Bread Wheat ◽  
Fine Mapping ◽  
Flag Leaf ◽  
Triticum Aestivum L ◽  
Leaf Width ◽  
Flag Leaf Width ◽  
Major Qtl

scholarly journals Changes to the Stoichiometry of Glycine Decarboxylase Subunits during Wheat (Triticum aestivum L.) and Pea (Pisum sativum L.) Leaf Development

1991 ◽  
Vol 96 (3) ◽  
pp. 952-956 ◽  
Author(s):  
W. John Rogers ◽  
Brian R. Jordan ◽  
Stephen Rawsthorne ◽  
Alyson K. Tobin
Keyword(s):  
Triticum Aestivum ◽  
Pisum Sativum ◽  
Leaf Development ◽  
Triticum Aestivum L ◽  
Glycine Decarboxylase ◽  
Pisum Sativum L

Growth and Yield Response of Wheat (Triticum aestivum L.) To Different Sowing Times and Weed Competition Durations.

2000 ◽  
Vol 3 (4) ◽  
pp. 681-682
Author(s):  
Asghar Ali ◽  
M. Asghar Malik . ◽  
Rana Majid Rahman . ◽  
Rashid Sohail . ◽  
M.M.Akram .
Keyword(s):  
Triticum Aestivum ◽  
Triticum Aestivum L ◽  
Growth And Yield ◽  
Yield Response ◽  
Weed Competition

scholarly journals SUNFLOWER COMPETITION IN WHEAT

1984 ◽  
Vol 64 (1) ◽  
pp. 105-111 ◽  
Author(s):  
GREG R. GILLESPIE ◽  
STEPHEN D. MILLER
Keyword(s):  
Triticum Aestivum ◽  
Helianthus Annuus ◽  
Flag Leaf ◽  
Wheat Yield ◽  
Triticum Aestivum L ◽  
Wheat Crop ◽  
Upper Midwest ◽  
Leaf Stage ◽  
Seeding Date ◽  
Field Season

Sunflower (Helianthus annuus L.) is grown in rotation with wheat (Triticum aestivum L.) in the upper midwest of the U.S.A. However, volunteer sunflower is often a problem in wheat planted the year following sunflower. Wheat yields as influenced by wheat seeding date and sunflower density, duration of sunflower competition and rate of sunflower control were determined in the field. Season-long sunflower competition at densities of 3, 9, and 23 plants per square metre reduced yield of the following wheat crop by an average of 11, 19, and 33%, respectively, averaged over seeding date and location. Sunflower was more competitive with wheat seeded in late than in early May, particularly at the lower sunflower densities. Wheat yield was reduced 22% when 24 sunflower plants/m2 were allowed to compete until the wheat flag-leaf stage. Wheat yields obtained were similar when volunteer sunflower was controlled by postemergence MCPA [[(4-chloro-o-tolyl)oxy] acetic acid], bromoxynil (3,5-dibromo-4-hydroxybenzonitrile), or bromoxynil plus MCPA despite the slower rate of control with MCPA compared to bromoxynil or bromoxynil plus MCPA. This research indicates that wheat following sunflower should be planted early and sunflower densities of nine plants per square metre or higher should be removed before the flag-leaf stage to prevent yield reductions.Key words: Density, duration, bromoxynil, MCPA, Helianthus annuus, Triticum aestivum

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