✦ LIBER ✦

Diversity and origins of endophytic fungal symbionts of the North American grassFestuca arizonica

✍ Scribed by Z.-q. An; J.-S. Liu; M. R. Siegel; G. Bunge; C. L. Schardl

Publisher: Springer
Year: 1992
Tongue: English
Weight: 604 KB
Volume: 85-85
Category: Article
ISSN: 0040-5752
DOI: 10.1007/bf00222883

No coin nor oath required. For personal study only.

✦ Synopsis

Acremonium spp. endophytes are mutualistic fungal symbionts of many C3 grasses. They are anamorphs of Epichloë typhina (Clavicipitaceae) that have become strictly seedborne, heritable components of symbiotic units ("symbiota"). In order to test the possibility that endophytes may contribute to the genetic diversity of symbiota, a survey was conducted of plants from nine populations of Festuca arizonica in the southern Rocky Mountains. Sequence analysis of rRNA gene segments distinguished three Acremonium endophyte types. Parsimony analysis indicated at least two distinct evolutionary origins of the Acremonium endophytes from E. typhina. Either or both of these evolutionary lineages may have involved cospeciation with the host.

📜 SIMILAR VOLUMES

Origin and diversity of North American h

Origin and diversity of North American hard spring wheats

✍ L. A. Mercado; E. Souza; K. D. Kephart 📂 Article 📅 1996 🏛 Springer 🌐 English ⚖ 725 KB

Genetic diversity is an important safeguard against crop vulnerability to biotic and abiotic stresses. Coefficient-of-parentage (COP) values of 248 North American hard spring wheat (Triticum aestivum L. em. Thell) cultivars released from 1901 to 1991 were used to estimate the genetic similarity of e

Origin, course, and laterality of spinoc

Origin, course, and laterality of spinocerebellar axons in the North American Opossum,Didelphis virginiana

✍ Terman, Jonathan R. ;Wang, Xian M. ;Martin, George F. 📂 Article 📅 1998 🏛 John Wiley and Sons 🌐 English ⚖ 928 KB

Spinocerebellar axons have been studied extensively in placental mammals, but there have been no full reports on their origin, laterality, or spinal course in any marsupial. We have used the North American opossum (Didelphis virginiana) to obtain such information and to ask whether any spinocerebell

Diversity and origin of abyssal tholeiit

Diversity and origin of abyssal tholeiite from the Mid-Atlantic Ridge near 24° and 30° North latitude

✍ Akiho Miyashiro; Fumiko Shido; Maurice Ewing 📂 Article 📅 1969 🏛 Springer 🌐 English ⚖ 887 KB

On cursory examination of hand specimens and thin sections, the abyssal tholeiite in a dredge haul may appear to be uniform in composition. Chemical analyses of a considerable number of fragments, however, have always revealed the existence of regular compositional variation in them. The MgO content

The risk of cystic fibrosis with prenata

The risk of cystic fibrosis with prenatally detected echogenic bowel in an ethnically and racially diverse North American population

✍ K. G. Monaghan; G. L. Feldman 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 164 KB 👁 1 views

Fetal echogenic bowel has been reported as a normal variant in the second trimester, and has also been associated with an adverse fetal outcome, including cystic fibrosis (CF), an autosomal recessive genetic disease. Previous studies have reported that 3.3 to 13.3 per cent of fetuses with echogenic