MARC details
| 000 -LEADER |
|---|
| fixed length control field |
02960nam a22003377a 4500 |
| 001 - CONTROL NUMBER |
|---|
| control field |
G94668 |
| 003 - CONTROL NUMBER IDENTIFIER |
|---|
| control field |
MX-TxCIM |
| 005 - DATE AND TIME OF LATEST TRANSACTION |
|---|
| control field |
20230704215225.0 |
| 008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION |
|---|
| fixed length control field |
121211s ||||f| 0 p|p||0|| | |
| 040 ## - CATALOGING SOURCE |
|---|
| Original cataloging agency |
MX-TxCIM |
| 041 ## - LANGUAGE CODE |
|---|
| Language code of text/sound track or separate title |
eng |
| 090 ## - LOCALLY ASSIGNED LC-TYPE CALL NUMBER (OCLC); LOCAL CALL NUMBER (RLIN) |
|---|
| Classification number (OCLC) (R) ; Classification number, CALL (RLIN) (NR) |
CIS-6197 |
| 100 1# - MAIN ENTRY--PERSONAL NAME |
|---|
| 9 (RLIN) |
2252 |
| Personal name |
Atlin, G.N. |
| 245 10 - TITLE STATEMENT |
|---|
| Title |
Forming double cross hybrids using two line synthetics |
| 260 ## - PUBLICATION, DISTRIBUTION, ETC. (IMPRINT) |
|---|
| Date of publication, distribution, etc. |
2010. |
| Place of publication, distribution, etc. |
Long Beach, CA (USA) : |
| 300 ## - PHYSICAL DESCRIPTION |
|---|
| Extent |
1 page |
| 500 ## - GENERAL NOTE |
|---|
| General note |
Abstract only |
| 520 ## - SUMMARY, ETC. |
|---|
| Summary, etc. |
In maize breeding programs in the developing world, double cross hybrids remain of interest due to lower seed costs. However, their production is cumbersome for small seed companies, due to the need to maintain four parental inbreds and to manage the F1 parent crossing blocks as well as the double-cross seed production field. One way to simplify double cross production is to form hybrids from F2 bulks or two-line synthetics derived from each single cross parent. In such a scheme, single cross parents would be advanced to F2 and maintained as two-line synthetics, then crossed to form the certified seed. Allelic frequencies in gametes produced by an F2 or a two-line synthetic should be similar to those produced by an equivalent F1, and therefore the array of genotypes formed from an F2 x F2 or two line synthetic cross should be equivalent to that produced by a conventional F1 x F1 cross. Both methods should therefore generate hybrids with similar performance. We tested this hypothesis in the CIMMYT tropical lowland maize breeding program in 2009. Five conventional double cross hybrids (F1 x F1) and corresponding F2 x F2 crosses were compared in trials at five locations in Southern Mexico. There was no significant difference in yield between F1 x F1 and F2 x F2 crosses. Further trials are being conducted to confirm these findings in 2010 in eastern and southern Africa. Although seed yields on F2 or two-line synthetic parents will be slightly less than on F1 seed parents , the method should be of interest to small seed companies in Africa who often have difficulty managing inbred lines, and could help small, local seed companies currently producing only open-pollinated varieties to embark on hybrid seed production. This, in turn, will increase the availability of low-cost hybrid maize seed to African smallholders. |
| 536 ## - FUNDING INFORMATION NOTE |
|---|
| Text of note |
Global Maize Program |
| 546 ## - LANGUAGE NOTE |
|---|
| Language note |
Text in English |
| 594 ## - STAFFID |
|---|
| StaffID |
INT2825|INT2396|INT2714 |
| 595 ## - COLLECTION |
|---|
| Collection |
CIMMYT Staff Publications Collection |
| 650 #7 - SUBJECT ADDED ENTRY--TOPICAL TERM |
|---|
| Source of heading or term |
AGROVOC |
| 9 (RLIN) |
26603 |
| Topical term or geographic name as entry element |
Cross-breeding |
| 650 #7 - SUBJECT ADDED ENTRY--TOPICAL TERM |
|---|
| Source of heading or term |
AGROVOC |
| 9 (RLIN) |
1151 |
| Topical term or geographic name as entry element |
Hybrids |
| 650 #7 - SUBJECT ADDED ENTRY--TOPICAL TERM |
|---|
| Source of heading or term |
AGROVOC |
| 9 (RLIN) |
1253 |
| Topical term or geographic name as entry element |
Seed production |
| 700 1# - ADDED ENTRY--PERSONAL NAME |
|---|
| Personal name |
Das, B. |
| Miscellaneous information |
Global Maize Program |
| -- |
Excellence in Breeding |
| Field link and sequence number |
INT2825 |
| 9 (RLIN) |
863 |
| 700 1# - ADDED ENTRY--PERSONAL NAME |
|---|
| 9 (RLIN) |
837 |
| Personal name |
Vivek, B. |
| Miscellaneous information |
Global Maize Program |
| Field link and sequence number |
INT2396 |
| Relator term |
coaut. |
| 700 1# - ADDED ENTRY--PERSONAL NAME |
|---|
| Personal name |
Magorokosho, C. |
| Miscellaneous information |
Formerly Global Maize Program |
| Field link and sequence number |
INT2714 |
| 9 (RLIN) |
854 |
| 773 ## - HOST ITEM ENTRY |
|---|
| Place, publisher, and date of publication |
CA (USA) : 2010 |
| Title |
ASA-CSSA-SSSA 2010 International Annual Meeting: Green revolution 2.0: Food+Energy and Environmental Security |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) |
|---|
| Koha item type |
Conference proceedings |
| Source of classification or shelving scheme |
Dewey Decimal Classification |