Relationship between stomatal frequencies, yield components and morphological characters in collections of winter wheat cultivars

1978 ◽  
Vol 20 (4) ◽  
pp. 287-292 ◽  
Author(s):  
J. F. Ledent ◽  
M. F. Jouret
Keyword(s):  
Winter Wheat ◽  
Yield Components ◽  
Morphological Characters ◽  
Wheat Cultivars ◽  
Winter Wheat Cultivars

EFFECT OF RATE AND DATE OF SEEDING ON YIELD AND YIELD COMPONENTS OF TWO WINTER WHEAT CULTIVARS GROWN IN ONTARIO

1979 ◽  
Vol 59 (4) ◽  
pp. 939-943 ◽  
Author(s):  
A. E. SMID ◽  
R. C. JENKINSON
Keyword(s):  
Winter Wheat ◽  
Yield Components ◽  
Test Weight ◽  
Yield Reduction ◽  
Wheat Cultivars ◽  
Seeding Rate ◽  
Yield And Yield Components ◽  
Winter Wheat Cultivars

Two cultivars of soft white winter wheat, Fredrick and Yorkstar, were sown at rates of 34, 67, 101, 134 and 168 kg/ha on or near 24 Sept., 9 Oct. and 23 Oct. in each of the 3 yr 1973–1975, at Ridgetown, Ontario. Highest net yields were obtained with rate of seeding 134 kg/ha. Seeding rate did not affect lodging. Yield per hectare and spikes per hectare were positively correlated while kernels per spike and spikes per hectare were negatively correlated. However, as the rate of seeding was increased, the increase in the number of spikes per hectare was greater than the accompanying decrease in kernels per spike, resulting in a net overall increase in yield. Highest yields of Fredrick were obtained near 9 Oct. and those of Yorkstar near 24 Sept. Yields decreased more rapidly with delayed seeding when seeding rates were less than 134 kg/ha, especially with Yorkstar. Test weight of Yorkstar was low, especially when sown late. Fredrick yielded 3–25% more than Yorkstar. A delay in seeding beyond 9 Oct. resulted in a yield reduction of 23 kg/ha/day. Fredrick should be sown instead of Yorkstar when seeding is delayed beyond recommended dates of seeding.

scholarly journals The Proportion of Superior Grains and the Sink Strength are the Main Yield Contributors in Modern Winter Wheat Varieties Grown in the Loess Plateau of China

Agronomy ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 612 ◽  
Author(s):  
Chen ◽  
Sun ◽  
Zhang ◽  
Palta ◽  
Deng
Keyword(s):  
Winter Wheat ◽  
Grain Yield ◽  
Plant Height ◽  
Loess Plateau ◽  
Aboveground Biomass ◽  
Yield Components ◽  
Wheat Cultivars ◽  
The Loess Plateau ◽  
Winter Wheat Cultivars ◽  
Cropping Seasons

Understanding the changes in phenotype resulting from the selection pressure and agronomic adaptation of grain yield provide an indication of the pathways for future increases in grain yield. Six dry land representative winter wheat cultivars (Triticum aestivum L.) released from 1942 to 2004 in the Loess Plateau of China were investigated to determine how the yield components of winter wheat were associated with grain yield at the Changwu Agricultural Research Station during the 2011–2012 and 2012–2013 seasons, using a completely randomized block design with three replicates. Plant height, aboveground biomass, grain yield, and yield components were measured, together with the traits of superior and inferior grains and the pre-anthesis stored dry matter remobilized to the grain was determined. In the relatively wet 2011–2012 season, there was a significant increase in grain yield and aboveground biomass with the year of release, but not in the dry 2012–2013 season. The harvest index (HI) and average grain weight (AGW) increased significantly with the year of release in both cropping seasons. HI and AGW are likely potential traits for improving grain yield of winter wheat in the Loess Plateau. The increase in HI mainly resulted from the decrease in plant height, and the increase in the use of pre-anthesis stored assimilates for grain filling. The increase in AGW mainly resulted from the increase in the proportion of superior grain (SG) and the decrease in the proportion of inferior grain (IG) in the whole spike in both cropping seasons. Depending on the climatic conditions, the different winter wheat cultivars showed different ability to use pre-anthesis stored assimilates. Modern wheat cultivars had higher yield under different rainfall conditions, and high ability to use pre-anthesis stored assimilates to fill the grain than earlier released cultivars. Both, the increase in sink capacity and source availability, should be considered as a strategy for increasing future grain yield in Loess Plateau of China.

Field resistance of Martonvásár winter wheat cultivars against Fusarium head blight

2005 ◽  
Vol 52 (4) ◽  
pp. 351-359 ◽  
Author(s):  
K. Puskás ◽  
G. Vida ◽  
J. Komáromi ◽  
O. Veisz ◽  
Z. Bedő
Keyword(s):  
Winter Wheat ◽  
Fusarium Head Blight ◽  
Yield Components ◽  
Kernel Weight ◽  
Field Resistance ◽  
Test Weight ◽  
Wheat Cultivars ◽  
Head Blight ◽  
Winter Wheat Cultivars ◽  
Fhb Resistance

Fifty Triticum aestivum genotypes, including winter wheat cultivars from Martonvásár, were tested for fusarium head blight (FHB) resistance under artificially inoculated conditions. Field resistance, kernel infection, and the relative yield components (test weight, thousand kernel weight and kernel weight/heads) were examined following infection with Fusarium graminearum and F. culmorum isolates. Using data from two years, a number of Martonvásár varieties with above-average resistance to FHB were identified. On the basis of field infection, AUDPC values close to those of resistance sources were calculated for the variety Mv Emese, while 67.5% of the varieties tested had values which did not differ significantly from those of the control variety Arina. The yield components examined were modified substantially by artificial FHB infection. The thousand kernel weight and test weight of the variety exhibiting the greatest degree of infection were only 21.14% and 25.58%, respectively, of the untreated control. In one case the decline in the kernel weight/head was more than 90%. The results of multivariable statistical analysis indicated that among the Hungarian wheat genotypes, Bánkúti 1201, B9086-95 (a line derived from Bánkúti 1201), Mv Emese, Martonvásári4 and Mv Táltos could be grouped with the best sources of resistance. The experimental data revealed wide genetic variability for FHB resistance in the Martonvásár breeding stock.

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