MARC details
| 000 -LEADER |
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| fixed length control field |
02525nab a22003617a 4500 |
| 001 - CONTROL NUMBER |
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| control field |
G66652 |
| 003 - CONTROL NUMBER IDENTIFIER |
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| control field |
MX-TxCIM |
| 008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION |
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| fixed length control field |
121211b |||p||p||||||| |z||| | |
| 040 ## - CATALOGING SOURCE |
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| Original cataloging agency |
MX-TxCIM |
| 090 ## - LOCALLY ASSIGNED LC-TYPE CALL NUMBER (OCLC); LOCAL CALL NUMBER (RLIN) |
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| Classification number (OCLC) (R) ; Classification number, CALL (RLIN) (NR) |
CIS-2017 |
| 100 1# - MAIN ENTRY--PERSONAL NAME |
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| Personal name |
Grimanelli, D. |
| 245 00 - TITLE STATEMENT |
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| Title |
Dosage effects in the endosperm of diplosporous apomictic Tripsacum (Poaceae) |
| 260 ## - PUBLICATION, DISTRIBUTION, ETC. (IMPRINT) |
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| Date of publication, distribution, etc. |
1997 |
| 340 ## - PHYSICAL MEDIUM |
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| Material base and configuration |
Printed |
| 520 ## - SUMMARY, ETC. |
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| Summary, etc. |
Imprinting in the endosperm of angiosperms, a phenomena by which expression of alleles differs depending on whether they originate from the male or female parent, has been shown to explain most failure of interploidy or interspecific crosses in plants. Because of imprinting, seeds develop normally only if a specific dosage is represented in the endosperm, with the relative contributions of genomes in the ratio of two maternal doses to one paternal dose (2m:1p). In Tripsacum, a wild relative of maize, all polyploids reproduce through the diplosporous type of apomixis. Diplospory results from meiotic failure in megasporocytes that develop into eight-nucleate unreduced female gametophytes. The male gametophytes remain unaffected. Flow cytometry was used to determine ploidy levels in the endosperm of both apomictic and sexual Tripsacum accessions. In both cases, fertilization appeared to involve only one sperm nucleus. Therefore, endosperm of apomictic Tripsacum develops normally even though the ratio of genomic contributions deviates from the normal 2m:1p ratio. Ratios of 2:1, 4:1, 4:2, 8:1 and 8:2 were observed, depending on both the ploidy level of the parents and the mode of reproduction. Thus, specific dosage effects are seemingly not required for endosperm development in Tripsacum. These findings suggest that evolution of diplosporous apomixis might have been restricted to species with few or no imprinting requirements, and the findings have strong implications regarding the transfer of apomixis to sexually reproducing crops |
| 546 ## - LANGUAGE NOTE |
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| Language note |
English |
| 591 ## - CATALOGING NOTES |
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| Affiliation |
R97-98ANALY|9808|anterior|EE|ABC|FINAL9798|3 |
| 592 ## - HEADER |
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| Header |
FR-INA-PG 1997 GRIMANELLI D rf |
| 595 ## - COLLECTION |
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| Collection |
CIMMYT Staff Publications Collection |
| 650 10 - SUBJECT ADDED ENTRY--TOPICAL TERM |
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| Topical term or geographic name as entry element |
Apomixis |
| 650 10 - SUBJECT ADDED ENTRY--TOPICAL TERM |
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| Topical term or geographic name as entry element |
Reproduction |
| 650 10 - SUBJECT ADDED ENTRY--TOPICAL TERM |
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| Topical term or geographic name as entry element |
Research projects |
| 9 (RLIN) |
1237 |
| 650 10 - SUBJECT ADDED ENTRY--TOPICAL TERM |
|---|
| Topical term or geographic name as entry element |
Tripsacum |
| 653 0# - INDEX TERM--UNCONTROLLED |
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| Uncontrolled term |
ORSTOM CIMMYT |
| 650 17 - SUBJECT ADDED ENTRY--TOPICAL TERM |
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| Topical term or geographic name as entry element |
Plant breeding |
| Miscellaneous information |
AGROVOC |
| Source of heading or term |
|
| 9 (RLIN) |
1203 |
| 700 1# - ADDED ENTRY--PERSONAL NAME |
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| Personal name |
Hernandez, M., |
| Relator term |
coaut. |
| 700 1# - ADDED ENTRY--PERSONAL NAME |
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| Personal name |
Perotti, E., |
| Relator term |
coaut. |
| 700 1# - ADDED ENTRY--PERSONAL NAME |
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| Personal name |
Savidan, Y., |
| Relator term |
coaut. |
| 740 ## - ADDED ENTRY--UNCONTROLLED RELATED/ANALYTICAL TITLE |
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| Uncontrolled related/analytical title |
66652 |
| 740 ## - ADDED ENTRY--UNCONTROLLED RELATED/ANALYTICAL TITLE |
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| Uncontrolled related/analytical title |
92767 |
| 773 0# - HOST ITEM ENTRY |
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| Title |
Sexual Plant Reproduction |
| Note |
618468 |
| Related parts |
v. 10, p. 279-282 |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) |
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| Koha item type |
Article |