Abstract
This study assesses the variability in buoyant density of nuclear DNA (nDNA) of corn and its relatives and the effect of several cytological phenomena on the demity of nDNA. The nDNAs of four Tripsacum L. spp., corn ( Zea mays L.), annual teosinte ( Z. mexieana [Schrad.] Kuntze), perennial teosinte ( Z. perennis [Hitchc.] Reeves and Manglesdorf), and corn‐tripsacum hybrids were characterized for buoyant densities. Corn and perennial teosinte nDNA densities were similar but were significantly greater than those of tripsacum and annual teosinte. The latter two did not differ in densities. The corntripsacum hybrid densities resembled those of the higher parent. However small significant differences in parental base composition did not preclude hybridization. In all cases, and typical of grasses, nDNAs were resolved as single bands without satellites and with relatively high guanine and cytosine contents. Chromosome numbers of T. andersonii Gray, in ed., Guatemala grass, are reported for the first time (2n = 64). Chromosomal knob numbers of 12 Tripsocum accessions ranged from 0 to 40. One Tripsacum accession had 3 to 4 B chromosomes. The presence of chromosomal knobs and B chromosomes in tripsacums had no effect on the banding pattern and buoyant density of the nDNAs as determined by neutral CsCI analytical eentrifugation. Although similarities and significant differences in buoyant densities of nDNA were found among corn and its relatives, the value of these results for establishing genetic relationships is not clear.
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Claims 11
Claim · model-written summary
Corn and perennial teosinte nDNA densities were similar.
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“corn ( Zea mays L.)”
e1“Corn and perennial teosinte nDNA densities were similar but were significantly greater than those of tripsacum and annual teosinte”
Claim · model-written summary
Corn and perennial teosinte nDNA densities were significantly greater than those of tripsacum and annual teosinte.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“corn ( Zea mays L.)”
e1“Corn and perennial teosinte nDNA densities were similar but were significantly greater than those of tripsacum and annual teosinte”
Claim · model-written summary
Tripsacum and annual teosinte did not differ in nDNA densities.
TripsacumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Corn and perennial teosinte nDNA densities were similar but were significantly greater than those of tripsacum and annual teosinte”
e2“The latter two did not differ in densities”
Claim · model-written summary
Corn-tripsacum hybrid nDNA densities resembled those of the higher parent.
Verbatim
e3“The corntripsacum hybrid densities resembled those of the higher parent”
Claim · model-written summary
Small significant differences in parental base composition did not preclude corn-tripsacum hybridization.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“corn ( Zea mays L.)”
e4“small significant differences in parental base composition did not preclude hybridization”
Claim · model-written summary
In grasses nDNAs were resolved as single bands without satellites.
Verbatim
e5“In all cases, and typical of grasses, nDNAs were resolved as single bands without satellites and with relatively high guanine and cytosine contents”
Claim · model-written summary
In grasses nDNAs had relatively high guanine and cytosine contents.
Verbatim
e5“In all cases, and typical of grasses, nDNAs were resolved as single bands without satellites and with relatively high guanine and cytosine contents”
Claim · model-written summary
Chromosome number of T. andersonii is 2n = 64, reported for the first time.
- Taxon
- T. andersoniiTripsacum andersoniie6
- Outcome
- Chromosome numberse6
- Value
- 2n = 64e6
Verbatim
e6“Chromosome numbers of T. andersonii Gray, in ed., Guatemala grass, are reported for the first time (2n = 64)”
Claim · model-written summary
Chromosomal knob numbers of Tripsacum accessions ranged from 0 to 40.
Verbatim
e7“Chromosomal knob numbers of 12 Tripsocum accessions ranged from 0 to 40”
Claim · model-written summary
One Tripsacum accession had 3 to 4 B chromosomes.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“One Tripsacum accession had 3 to 4 B chromosomes”
Claim · model-written summary
Chromosomal knobs and B chromosomes had no effect on the banding pattern and buoyant density of nDNA in tripsacums.
- Treatment
- presence of chromosomal knobs and B chromosomese1
- Outcome
- banding pattern and buoyant density of the nDNAse1
- Direction
- had no effecte1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The presence of chromosomal knobs and B chromosomes in tripsacums had no effect on the banding pattern and buoyant density of the nDNAs”