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  • Triticum aestivum  (105)
  • Springer  (105)
  • Annual Reviews
  • Elsevier
  • 2020-2022
  • 1980-1984  (105)
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  • 1950-1954
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  • Springer  (105)
  • Annual Reviews
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  • 101
    Electronic Resource
    Electronic Resource
    Springer
    Euphytica 32 (1983), S. 241-255 
    ISSN: 1573-5060
    Keywords: Triticum aestivum ; wheat ; physiology ; grain yield ; inheritance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Post anthesis physiological characters were examined in four genotypes and a diallel set of their progenies. Variation in total carbon uptake by photosynthetic tissue above the flag leaf node was primarily related to leaf area and ear size differences during the early grain filling period. Flag leaf apparent photosynthetic rates during the late grain filling period were closely correlated with flag leaf chorophyl levels. During the period of rapid growth, genotypes differed in the proportion and total quantity of current assimilate translocated to the grain. Total rather than proportional translocation was correlated with grain number and grain yield. Differences in total grain protein were primarily related to total plant nitrogen at anthesis and secondarily to the proportion of this nitrogen translocated to the grain. The level of post anthesis nitrate reductase activity decreased with increasing flag leaf age, but genotypic differences were not closely related to differences in total grain protein contents. Significant general combining ability effects were found for flag leaf chlorophyll levels, flag leaf photosynthetic rates at higher illuminances during the late grain filling period, total plant carbon uptake, total ear carbon uptake, and proportional carbon translocation to the grain. A preponderance of significant general combining ability variances suggests that additive gene action is of particular importance in the inheritance of these physiological characters.
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  • 102
    Electronic Resource
    Electronic Resource
    Springer
    Euphytica 32 (1983), S. 257-271 
    ISSN: 1573-5060
    Keywords: Triticum aestivum ; bread wheat ; Triticum durum ; durum wheat ; Triticum compactum ; collection ; germplasm ; land-races ; local varieties
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Wheat has traditionally been grown by the Beduin population in the semi-arid (150 to 200 mm, mean total annual rainfall) northern Negev region of Israel. A collection was made in this area (the size of which is 150 km2) from small (0.1 to 0.5ha) fields of mixed wheat, resulting in 1553 collected spikes. Each spike was planted in a 1 m row at Bet Dagan, and grown under favorable conditions. Qualitative and quantitative data were collected from each row. Qualitative data were submitted to hierarchial clustering and the results were compared with published information on the identification, classification and distribution of the land-races of wheat in the Middle East. Triticum durum was represented in 84% of the collection. It was clustered into 22 populations, identified as 11 known varietas of T. durum. They were aggregated into five groups, similar to groups of old varieties recognized by Jacubziner (1932). While 38.5% of the collection consisted of T. durum groups villosa and sinaica, aboriginal to the northern Negev, it included also forms similar to several land-races found in the past in other parts of the Middle East. Each of the populations, and the durum collection as a whole, was very diverse for the quantitatively measured plant attributes. Triticum aestivum was represented in 15.6% of the collection, clustered into six populations. Most of the common wheat accessions were analogous to the old locally grown variety Hirbawi. Triticum compactum was represented in only eight accessions. The collection is now being evaluated as a potential genetic resource for durum wheat breeding.
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  • 103
    ISSN: 1573-5060
    Keywords: Triticum aestivum ; bread wheat ; grains ; dry matter and nitrogen ; distribution within ear ; plant height
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Distribution and accumulation of dry matter (d.m.) and nitrogen (N) were investigated within ears of a semidwarf, a gigas, and a normal wheat genotype grown under controlled environments. A high harvest index was linked with a small pre-anthesis N-storage (and vice versa) but this did not affect N amounts in grains because of compensation by prolonged N uptake during grain filling. N distribution within and between spikelets roughly paralleled that of d.m. Nevertheless, the two processes appeared to be rather independent as became evident from comparisons of the time courses in and between the genotypes. Final distribution of d.m. and N within and between spikelets mainly depended on different rates during the linear phases of accumulation and less on the duration. Maximum of d.m. and N weights per grain as well as maximum of grain number were observed in spikelets below the middle of the ear axis. This ‘submedian dominance’ suggested a pre-anthesis determination of the accumulation potential of grains in different spikelets. N percentage within spikelets disclosed that N accumulation was hampered more than that of d.m. in those positions unfavourable to the latter process. This principal pattern was not affected by genotypes in spite of considerable differences in numbers and weights of grains.
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  • 104
    Electronic Resource
    Electronic Resource
    Springer
    Euphytica 32 (1983), S. 575-584 
    ISSN: 1573-5060
    Keywords: Triticum aestivum ; wheat seedlings ; Triticum sp. ; Septoria nodorum ; glume blotch disease ; components of partial resistance ; multivariate analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Components of partial resistance of wheat seedlings to Septoria nodorum were measured in a glasshouse. Incubation period, infection frequency, latent period, lesion size, lesion cover, necrosis and unit spore production were recorded on 41 Triticum genotypes. There was no clear evidence of associated variation in components and multivariate analyses were used to elucidate such relationships. Factor analysis indicated that pathogen-induced necrosis, related possiby to toxin susceptibility, and unit spore production were major components of partial resistance to S. nodorum. Principal component analysis was used to characterise genotypes: associated with a continuous general resistance could be a high level of pathogen-induced necrosis or a high unit spore production, but rarely both in the same genotype.
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  • 105
    ISSN: 1573-5036
    Keywords: Azospirillum brasilense ; Wheat ; Triticum aestivum ; N-fertilizer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The yield response of a common spring wheat cultivar,Triticum aestivum, to inoculation withAzospirillum brasilense was studied at four levels of N fertilization. Plant yield increased due to the inoculation treatment only at medium and high levels of N fertilization, with a maximum yield increase of about 8.0 per cent at the highest level (approximately 1.0 g of pure N per plant). Yield increase was mostly due to an increase in the number of grains per spike, and at the highest level of fertilization, also due to a higher number of spikes per plant. At all N levels, the inoculation caused an increase of 0.5–1.4 per cent in the number of fertile spikelets per main spike. Grain protein percentage was unaffected by the inoculation, though significantly increase due to the fertilization treatments. The occurrence of maximum yield response at the highest N level, the response by early-determined yield components, i.e. spikelet number, and the unaffected grain protein content are in accord with the suggestion that the contribution ofAzospirillum brasilense to wheat yield is not through N2-fixation.
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