Rumen digestibility in dairy cows of starch in near-isogenic lines of wheat

1999 ◽  
Vol 1999 ◽  
pp. 90-90
Author(s):  
P.C. Garnsworthy ◽  
J. Wiseman
Keyword(s):  
Near Isogenic Lines ◽  
Limited Information ◽  
Wheat Varieties ◽  
Isogenic Lines ◽  
Relative Value ◽  
Metabolisable Energy ◽  
Growing Conditions ◽  
The Uk ◽  
Wheat Lines ◽  
Agronomic Conditions

Wheat is a good source of carbohydrates for ruminants, and recent low prices in the UK suggest that usage is likely to increase. However, there is a shortage of information on the digestibility of wheat in the rumen. Such information is vital for predicting the relative value of wheat as a source of fermentable metabolisable energy or by-pass starch. Digestibility is likely to be affected by growing conditions and genetics. Genetic differences are found between wheat varieties, but comparisons of named varieties yield limited information because many characteristics vary simultaneously. This problem can be overcome by using near-isogenic lines of wheat that vary only in a limited number of known characteristics. The objective of this study was to determine the rumen digestion characteristics of different near-isogenic wheat lines grown under the same agronomic conditions.

scholarly journals Effect of cytoplasm on expression of genes for resistance to Puccinia triticina

2007 ◽  
pp. 43-48
Author(s):  
Zoran Jerkovic ◽  
Marina Putnik-Delic
Keyword(s):  
Puccinia Triticina ◽  
Seedling Stage ◽  
Near Isogenic Lines ◽  
Wheat Varieties ◽  
Reaction Type ◽  
Isogenic Lines ◽  
Expression Of Genes ◽  
Resistant Varieties ◽  
Complete Resistance

The F2 progenies from crosses of wheat varieties Pliska, Sreca, Vila, Holly, three BM lines as Lr 26, Lr 34 and Lr 38 near isogenic lines (NIL), were tested simultaneously in the greenhouse at seedling stage (20?C) and differentiated according to the reaction type to Puccinia triticina monopustule isolate collected from Pesma, the most resistant wide grown variety in Serbia. The presence of Lr 26 and Lr 26 + Lr 34 genes was found in incomplete but not in partially resistant varieties Sreca and Vila. Pliska and three BM lines had a complete resistance controlled by other genes. Genes from Pliska acted complementary in authentic cytoplasm and were single effective in Lr 34 NIL (Thatcher background) one. Resistance of two BM lines was dependent of one gene. Lr 26 and Lr 34 had influence on resistance enhancement in the F2 of crosses with Sreca and Vila when NILs were donors of cytoplasm. They also increased frequency of completely resistant plants in progenies of Pliska. Resistance suppression controlled by gene linked with Lr 34 on 7D chromosome was evident.

A phenological evaluation of wheat for south-western Victoria

1984 ◽  
Vol 35 (4) ◽  
pp. 521 ◽  
Author(s):  
HJ Crofts ◽  
WK Gardner ◽  
RG Velthuis
Keyword(s):  
Growing Season ◽  
Near Isogenic Lines ◽  
High Rainfall ◽  
Isogenic Lines ◽  
Group I ◽  
Reference Environment ◽  
Photoperiod Sensitive ◽  
Western Victoria ◽  
Wheat Lines

Wheat lines and varieties known to vary phenologically were investigated in a serial sowing at two locations in south-western Victoria. They were classified into five categories: winter wheats, groups I and 11; semi-winter wheats; photoperiod-sensitive spring wheats; and relatively insensitive wheats. Only the winter wheats group I, and photoperiod-sensitive spring wheats were able to fully utilize the growing season available in the high rainfall areas of south-western Victoria. A system of cultivar evaluation in target environments, by the use of comparisons to near-isogenic lines in a reference environment, is discussed.

Agronomic characteristics of hard red spring wheat (Triticum aestivum L.) near-isogenic lines differing at the Waxy (Wx) locus

2015 ◽  
Vol 95 (2) ◽  
pp. 201-204 ◽  
Author(s):  
Pierre Hucl ◽  
Adithya Ramachandran
Keyword(s):  
Triticum Aestivum ◽  
Spring Wheat ◽  
Triticum Aestivum L ◽  
Waxy Gene ◽  
Near Isogenic Lines ◽  
Hard Red Spring Wheat ◽  
Isogenic Lines ◽  
Agronomic Characteristics ◽  
Wx Locus ◽  
Wheat Lines

Hucl, P. and Ramachandran, A. 2015. Agronomic characteristics of hard red spring wheat (Triticum aestivum L.) near-isogenic lines differing at the Waxy (Wx) locus. Can. J. Plant Sci. 95: 201–204. Null mutations of the Waxy gene in all three genomes of hexaploid wheat (Triticum aestivum L.) produce a waxy starch phenotype. The agronomic performance of 32 waxy, partially waxy and wild-type near-isogenic spring wheat lines and four check cultivars was assessed at two locations over three cropping seasons. Differences in grain yield, kernel weight and test weight among allelic groups were generally small. The results of our study suggest that no significantly negative effects are likely to occur in the commercial cultivation of partially waxy wheat lines derived from a CWRS cultivar.

The energy and protein value of lupins for ruminants

1996 ◽  
Vol 1996 ◽  
pp. 22-22 ◽  
Author(s):  
Angela R. Moss ◽  
D. I. Givens
Keyword(s):  
Dry Matter ◽  
Energy Content ◽  
Lupinus Albus ◽  
Latin Square ◽  
New Variety ◽  
Bean Meal ◽  
Metabolisable Energy ◽  
Soya Bean Meal ◽  
The Uk ◽  
Agronomic Conditions

A substantial proportion of the protein needs of highly productive ruminants in the UK is met by imported protein sources notably soya bean meal (SBM). New determinate varieties of sweet lupin (DSL) (Lupinus albus) low in alkaloids offer the potential to be a useful source of protein as agronomic conditions favour their cultivation in temperate climates where other proteinaceous legumes fail. There are at present no data on the new determinate varieties developed and under agronomic test in the UK. The objective of the work was to determine the chemical composition and the rumen degradability of nitrogen (N) of two UK varieties of lupins and to determine the digestibility and energy value of one of these varieties.The digestibility and metabolisable energy content of one new variety (CH304/70) of UK grown DSL was determined in a hay based diet using wether sheep (n = 5). The diets were offered in a 4 x 4 latin square design at foragexoncentrate ratios of 1.0, 0.9, 0.8 and 0.6 (dry matter (DM) basis) at near to the maintenance level of feeding.

Selection of Puccinia recondita f.sp. tritici virulence phenotypes in three multilines of Thatcher wheat lines near isogenic for leaf rust resistance genes

1995 ◽  
Vol 73 (7) ◽  
pp. 1081-1088 ◽  
Author(s):  
J. A. Kolmer
Keyword(s):  
Leaf Rust ◽  
Resistance Genes ◽  
Rust Resistance ◽  
Leaf Rust Resistance ◽  
Puccinia Recondita ◽  
Near Isogenic Lines ◽  
Isogenic Lines ◽  
Wheat Lines ◽  
Rust Resistance Genes ◽  
Leaf Rust Resistance Genes

A heterogeneous population of Puccinia recondita f.sp. tritici developed from randomly mated pycnial infections on Thalictrum speciosissimum was selected for 12 generations on three multilines composed of Thatcher wheat lines near-isogenic for leaf rust resistance genes. Multiline 1 was composed of 20% each of lines near-isogenic for resistance genes Lr2a, Lr3ka, Lr11, Lr17, and Lr24. Multiline 2 was composed of equal proportions each of Thatcher and the five near-isogenic lines in multiline 1. Multiline 3 was composed of 50% Thatcher and 10% each of the five near-isogenic lines. Diversity of virulence phenotypes as measured by the Shannon index declined most in the population selected on multiline 1. Phenotypes of P. r. tritici with virulence to three of the five resistance genes in the multilines were the predominant isolates in all three populations after 12 generations of selection. Frequency of phenotypes with virulence to resistance genes Lr2a and Lr11 significantly increased in all three populations. Virulence to Lr11 significantly increased in the multiline 3 population, and virulence to Lr24 increased in populations from multilines 2 and 3. Frequency of phenotypes with virulence to Lr3ka did not significantly change in any of the populations. Virulence phenotypes with an intermediate number of virulences appeared to have fitness advantage relative to other isolates on the three host multilines. These results indicate that use of wheat multilines may not necessarily stabilize selection for virulence complexity in P. r. tritici populations. Key words: mixtures, Triticum aestivum, wheat leaf rust.

The energy and protein value of lupins for ruminants

1996 ◽  
Vol 1996 ◽  
pp. 22-22
Author(s):  
Angela R. Moss ◽  
D. I. Givens
Keyword(s):  
Dry Matter ◽  
Energy Content ◽  
Lupinus Albus ◽  
Latin Square ◽  
New Variety ◽  
Bean Meal ◽  
Metabolisable Energy ◽  
Soya Bean Meal ◽  
The Uk ◽  
Agronomic Conditions

A substantial proportion of the protein needs of highly productive ruminants in the UK is met by imported protein sources notably soya bean meal (SBM). New determinate varieties of sweet lupin (DSL) (Lupinus albus) low in alkaloids offer the potential to be a useful source of protein as agronomic conditions favour their cultivation in temperate climates where other proteinaceous legumes fail. There are at present no data on the new determinate varieties developed and under agronomic test in the UK. The objective of the work was to determine the chemical composition and the rumen degradability of nitrogen (N) of two UK varieties of lupins and to determine the digestibility and energy value of one of these varieties.The digestibility and metabolisable energy content of one new variety (CH304/70) of UK grown DSL was determined in a hay based diet using wether sheep (n = 5). The diets were offered in a 4 x 4 latin square design at foragexoncentrate ratios of 1.0, 0.9, 0.8 and 0.6 (dry matter (DM) basis) at near to the maintenance level of feeding.

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