Selection of alfalfa for a lower initial rate of digestion and corresponding changes in epidermal and mesophyll cell wall thickness
| Autor: | G. L. Lees, B. P. Goplen, R. E. Howarth |
|---|---|
| Rok vydání: | 1993 |
| Předmět: |
geography
geography.geographical_feature_category Vegetative reproduction Turgor pressure food and beverages Plant Science Horticulture Biology Photosynthesis Acclimatization Pasture Animal science parasitic diseases Botany Dry matter Digestion Agronomy and Crop Science Selection (genetic algorithm) |
| Zdroj: | Canadian Journal of Plant Science. 73:111-122 |
| ISSN: | 1918-1833 0008-4220 |
| DOI: | 10.4141/cjps93-014 |
| Popis: | A modified nylon bag technique, described in detail in this paper, appears to be an effective method of selecting for a lower initial rate of digestion (IRD) in alfalfa. Breeding for reduced IRD in alfalfa resulted in a 15% reduction in 4-h dry matter disappearance (DMD) after three cycles of selection (ultimate goal of 25–30 % reduction for a bloat-safe alfalfa). No further reduction in IRD occurred with a 4th cycle of selection. The IRD characteristic appears to be expressed at early stages of vegetative growth (pre-bud to early bud) and not at a more advanced stage of maturity (mid-bud to early bloom). The IRD characteristic also appears to be subject to environmental influence. Alfalfa plants selected for reduced IRD have consistently thicker cell walls compared to the unselected alfalfa check cv. Beaver. The advanced cycle 4 LIRD synthetic is being increased for subsequent pasture trials and assessment of bloat reduction. Key words: Nylon bag technique, cell rupture, pasture bloat, initial rate of digestion, cell wall thickness |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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