Dwarf alleles differentially affect barley root traits influencing nitrogen acquisition under low nutrient supply
| العنوان: | Dwarf alleles differentially affect barley root traits influencing nitrogen acquisition under low nutrient supply |
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| المؤلفون: | Geoffrey R. Squire, Alison J. Karley, Tracy A. Valentine |
| المصدر: | Journal of Experimental Botany |
| بيانات النشر: | Oxford University Press, 2011. |
| سنة النشر: | 2011 |
| مصطلحات موضوعية: | Genotype, Physiology, Nitrogen, Plant Science, Biology, Plant Roots, nitrogen use efficiency, Crop, Nutrient, Genetic variation, Poaceae, Allele, ari.e-GP, trait, food and beverages, Genetic Variation, Ideotype, Hordeum, root, Research Papers, remobilization, Agronomy, sdw1, uptake, Shoot, Hordeum vulgare, semi-dwarf barley |
| الوصف: | Sustainable food production depends critically on the development of crop genotypes that exhibit high yield under reduced nutrient inputs. Rooting traits have been widely advocated as being able to influence optimal plant performance, while breeding-based improvements in yield of spring barley suggest that this species is a good model crop. To date, however, molecular genetics knowledge has not delivered realistic plant ideotypes, while agronomic trials have been unable to identify superior traits. This study explores an intermediate experimental system in which root traits and their effect on plant performance can be quantified. As a test case, four modern semi-dwarf barley varieties, which possess either the ari-e.GP or the sdw1 dwarf allele, were compared with the long-stemmed old variety Kenia under two levels of nutrient supply. The two semi-dwarf types differed from Kenia, exhibiting smaller stem mass and total plant nitrogen (N), and improved partitioning of mass and N to grain. Amongst the semi-dwarfs, the two ari-e.GP genotypes performed better than the two sdw1 genotypes under standard and reduced nutrient supply, particularly in root mass, root investment efficiency, N acquisition, and remobilization of N and mass to grain. However, lack of between-genotype variation in yield and N use efficiency indicated limited potential for exploiting genetic variation in existing varieties to improve barley performance under reduced nutrient inputs. Experimental approaches to test the expression of desirable root and shoot traits are scrutinized, and the potential evaluated for developing a spring barley ideotype for low nutrient conditions. |
| اللغة: | English |
| تدمد: | 1460-2431 0022-0957 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::11b3ac915ad44153dd682e726172959cTest http://europepmc.org/articles/PMC3134348Test |
| حقوق: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....11b3ac915ad44153dd682e726172959c |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 14602431 00220957 |
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