Evaluating the genotype × nitrogen fertilization interaction on the nutritive value of the first crop in timothy (Phleum pratense L.) clones

Publication Type:Journal Article
Year of Publication:2012
Authors:Ashikaga, K, Tanaka, T, Fujii, H, Deguchi, K, Iida, K
Journal:Grassland Science
Volume:58
Issue:1
Date Published:2012
ISBN Number:1744-697X
Keywords:First crop, genotype ranking, Nitrogen fertilization, nutritive value, Phleum, timothy
Abstract:

Improvement of the nutritive value of timothy (Phleum pratense L.) through breeding should result in enhanced livestock productivity. This study evaluated the effect of genotype (G) × nitrogen (N) fertilization interaction (G × N) on the nutritive value of the first crop of timothy in northern Japan. Five traits, the contents of low-digestible fiber (Ob), water-soluble carbohydrate (WSC), mono- and disaccharides and fructan and the ratio of Ob to organic cell wall (OCW), were investigated as quality traits for 16 clones under three N rates (3, 7 and 11 g N m–2 as low, standard and high levels, respectively). The G × N effects were non-significant in all the traits despite the significant main effects of G and N in all or most of the traits. Coinciding with this, there were significant correlations among the three N rates for Ob, WSC, fructan contents and Ob/OCW ratio. Correlations between the low and high N rates showed weaker trends than those between the standard and low N rates or between the standard and high N rates in three of the five traits. Fructan content showed small standard deviations and ranges, indicating the difficulty of using it as a selection index for evaluating the genetic variation. The results suggest that, for the Ob and WSC contents and the Ob/OCW ratio as the desirable traits, the relative ranking of genotypes is almost consistent across different N application levels and selections for the traits at the standard N level are of potential use for effective improvement of the nutritive value of timothy.

URL:http://dx.doi.org/10.1111/j.1744-697X.2011.00241.x
Short Title:Grassland Science
Taxonomic name: 
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