ISSN:
1573-5060
Keywords:
Medicago sativa
;
Medicago glandulosa
;
Medicago glutinosa
;
Medicago prostrata
;
trichomes
;
insect resistance
;
glandular hair density
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Summary Because a number of insect pests periodically reduce the yields and/or quality of alfalfa, control measures are often required to prevent or limit losses. Physical characteristics such as glandular hairs have been associated with resistance to alfalfa insect pests. This study was conducted to determine the occurrence and relationships of glandular hair density on three perennial Medicago species that can be crossed with alfalfa, M. sativa L. Glandular hairs were visually counted on the stem, leaflet margin, abaxial leaflet surface, leaf midrib, and petiole of M. glandulosa David, M. glutinosa Marshall Von Bieberstein, and M. prostrata Jacquin. Environmental and genotypic correlations were obtained to estimate the relationships between hair densities on different structures of each Medicago species. Erect glandular hairs were present on all the vegetative structures of the plants, but density and distribution varied within species. Mean hair density was relatively high and uniform on stems, petioles, leaflet margins, midribs, and abaxial leaflet surfaces of M. prostrata. Glandular hair densities were more dense on stems and petioles than on the leaflets of M. glandulosa and M. glutinosa. Relatively high genotypic and environmental correlation coefficients were obtained when hair densities on stems, petioles, leaflet margins, abaxial leaflet surfaces, and leaflet midribs were compared. Selection on the basis of glandular hair density on one Medicago structure can lead to correlated responses in glandular hair density on other structures on the plant.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00037891
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