awn

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awn

see ARISTA (2).

awn

a long, sharp spine projecting from the coverings about a seed. They assist the seedhead in penetration of the skin and then migration through very large distances into all tissues, including even the canine intervertebral disk. They are common subcutaneous foreign bodies in sheep, where they appear to do no harm, and dogs where they commonly cause abscesses and some chronic, discharging fistulae. They are particularly troublesome in the nasal cavity, ears and eyes of dogs.
References in periodicals archive ?
The awnless pollinator and awned female parents, including the semidwarf wheat, were isolated 30 cm from each other.
The parental lines used were an awnless hulled cultivar, Marion referred to as `Marion QC' by Dubuc and Comeau (1989); two awnless nonfatuoid naked oat cultivars, `Terra' (McKenzie et al.
Panicles without any geniculate lemma awns were classified as awnless.
awnless, one awn per spikelet, two awns per spikelet, three awns per spikelet) to be advanced to the [F.
2] populations of each of the five crosses, observed phenotypic ratios for awn number were compared to a 1:2:1 ratio (1 awnless plant:2 plants with one awn per spikelet:1 plant with two or more awns per spikelet) and to a 3:1 ratio (3 plants with no awns or one awn per spikelet: 1 plant with two or more awns per spikelet) by [chi square] tests for goodness-of-fit.
1 awnless plant:2 plants with one awn per spikelet:1 plant with two or more awns per spikelet), with more than the expected number of awnless plants and less than the expected number of plants with one awn per spikelet (Table 1).
some plants with all naked grain and some mosaic plants, or some awnless plants and some plants with one awn per spikelet) seem more appropriate, but there were some cases of significant deviation from the 3:1 ratios expected for these models.
Under this model, one would expect that most awnless plants are homozygous nonfatuoids (but a few might be heterozygotes), that plants with one awn per spikelet are either homozygous or heterozygous nonfatuoids (with more heterozygotes than homozygotes), and that most plants with two or more awns per spikelet are homozygous fatuoids.
The second expectation was not met, with only two families consisting predominantly of awnless plants (a 63:6:9 ratio and a 37:10:4 ratio).
Sixteen of the P-7's 25 component populations are predominately awned and 9 are predominately awnless (Larson et al.