Mating systems and interfertility of swamp milkweed (Asclepias incarnata ssp. incarnata and ssp. pulchra)
Article Abstract:
Evidence of the complexity of milkweed breeding systems is accumulating. The breeding system and interfertility of the two subspecies of Asclepias incarnata milkweed have been investigated. The plants of ssp. incarnata turned out to be about one-sixth as likely as those of ssp. pulchra to mature hand self-pollinated fruits. Plants varied in self-fertility and cross-fertility to a significant degree. From intersubspecific crosses, fertile offspring were produced, but hybrid plants had lower pollen fertility than parent plants. Swamp milkweed is not fully self-compatible, but is not self-incompatible. Variation in frequencies of alleles that affect expression of the self-incompatibility system may be a factor.
Publication Name: Heredity
Subject: Biological sciences
ISSN: 0018-067X
Year: 1999
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Informed strain improvement for lignin degradation by Phanerochaete chrysosporium
Article Abstract:
Heterokaryotic strains of Phanerochaete chrysosporium ME446, with restriction fragment length polymorphism, show greater lignin mineralization than the homokaryotic parental strains. The improvement in lignin degradation is multifactorial, irrespective of the activity of single alleles. Difference in the performance of the heterokaryotic strains and their meiotically produced progeny is low. The lignin peroxidase used by the fungus probably exists in the mycelium as it is not detectable in the supernatant liquid. Strain improvement in the fungus is possible without mutagenesis.
Publication Name: Microbiology
Subject: Biological sciences
ISSN: 1350-0872
Year: 1995
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Degradation pathway of CopA, the antisense RNA that controls replication of plasmid R1
Article Abstract:
A study was conducted to examine the degradation of CopA, the copy number regulator RNA of plasmid R1. The degradation pattern and relative half-lives of the regulator were examined using strains carrying mutations in the RNase E. Results indicated that the decay of the CopA regulator were initiated by RNase E. Moreover, additional proteins in the cell modulates the cleavage site specificity of RNase.
Publication Name: Microbiology
Subject: Biological sciences
ISSN: 1350-0872
Year: 1998
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