Germplasm Enhancement of Maize

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GEM - 2005 Public Cooperator's Report

NOTE: The information in this report is shared cooperatively. The data are not published, but are presented with the understanding that they will not be used in publications without specific consent of the public cooperator.

 

Raleigh, NC, November 2005 Progress Report

Major Goodman

North Carolina State University

This report summarizes the research conducted under specific cooperative agreements between the ARS and N.C. State University. Additional details will be available in handouts at the December, 2005, cooperators meeting and the December, 2005, TSG meeting.  This subproject is concerned with nine aspects of the overall GEM effort. (1) The development of GEM families from breeding crosses. (2) Making topcross seed of the families. (3) Setting up appropriate experiments to compare the topcross families with commercial and experimental checks. (4) Providing seed for these experiments to 15 additional GEM collaborators. (5) Growing the experiments ourselves at several locations. (6) Analyzing and summarizing our own and our collaborators data. (7) Selecting the better materials for subsequent‑year trials. (8) Increasing seed of better families, providing it to Ames and other GEM cooperators and to the NCRPIS. (9)  Sampling allelic diversity from representative races not encompassed by GEM yield-trial efforts.

144 entries (out of 1086 tested) have been advanced from first year to second year trials in 2005, and 27 entries (out of 216 tested) advanced from second year to third year testing.  In 2005, 12,421 yield trial plots were coordinated through Raleigh (4,013 planted at NC State locations).  Approximately, 885 nursery rows, and 1020 isolation block rows were planted in 2005 at Raleigh.  Nursery work involves 10 new breeding crosses and 10 additional breeding crosses derived from tropical inbred lines.  In 2005, 19 GEM families were recommended to GEM Cooperators and provided from stocks furnished to Ames; five additional families were recommended and provided directly from Raleigh.

We have continued routine screening of available tropical lines, as so little data are available to choose among them for use in GEM or other research.  A summary of some of that work has been accepted as an invited article for the 50th anniversary issue of Maydica.

In 2004, the effort to evaluate GEM breeding crosses for yield per se was continued as part of an overall effort to evaluate new material.  Data from that study revealed a great spread in yield potential and heavily influenced our choices for 2005 nursery work.  Direct tests of Breeding Cross F1s were continued in 2005, and data was obtained for 5 locations.  The following crosses look reasonably promising:

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PEDIGREE           Bu/A.    H2O     %E.P.     PEDIGREE           Bu/A.    H2O     %E.P.
CHIS775:s19        141.4    20.2    87.8      PE01:n16 (51403)   114.0    20.4    88.6
BR105:n16          131.4    19.9    90.6      CML329:n18         113.2    17.8    95.8
FS8A(T):n18        127.1    19.9    87.2      PE11:n11a(51501)   112.4    19.2    92.4
FS8B(T):n11a       126.0    19.5    89.6      SANM126:n12        112.2    20.9    88.0
BR105:s16          125.6    21.2    88.6      PASCO14:n24        112.2    21.9    89.2
FS8B(T):n18        124.2    19.7    87.8      DKXL212:s09        111.0    17.8    97.2
RN07:n20 (51721)   121.2    21.4    77.6      CML325:s18         110.8    16.8    96.0
NS1:s08            120.4    22.5    89.4      GUAT209:n11c       110.6    17.8    82.2
PE11:s11a(51501)   120.2    20.8    89.6      PE27:n06 (51675)   106.8    17.0    88.4
CUBA164:D27        118.6    22.3    86.8      CUBA164:s11c       106.2    18.3    89.2
DK212T:s06         118.4    20.8    89.6      CL‑00331:n18       105.8    21.4    97.4
BVIR155:s18        118.2    21.2    92.8      GUAT209:s13        103.0    19.7    87.2
ANTIG01:n16        117.6    19.0    88.2      PASCO14:n11b       102.4    18.9    92.8
DKB830:s19         116.8    20.2    87.8      CHIS775:n19        101.6    20.5    95.2
DKB844:n11b        114.8    16.9    93.4      PASCO14:s11a       100.6    19.9    89.0
SCRO1:n11c         114.2    19.3    84.0      SE33:n03 (52060)   100.4    19.4    89.4
 

In contrast, the following Breeding Cross F1s look as though they should be avoided:

PEDIGREE            Bu/A.   H2O     %E.P.     PEDIGREE            Bu/A.   H2O     %E.P.
ANTIG01:s02         98.2    21.9    69.4      DKXL380:n11a        73.2    20.1    91.4
CML323:s17b         80.2    16.1    94.0      CML287:n13          70.6    22.1    87.6
NEI9004:n08         80.0    19.8    95.0      NEI9008:s17c        70.0    19.1    94.4
DKXL370:s08c        78.6    17.9    97.0      BARBGP2:n08d        68.4    19.2    79.0
CL‑G1501:s17b       77.4    18.9    92.0      NEI9008:s17a        68.2    19.1    93.4
DK888:s08c          77.2    23.5    93.6      NEI9008:s17b        68.0    18.6    89.6
NEI9008:n08         75.4    20.9    91.2      CHIS740:s14         67.2    24.5    89.2
DKXL380:s08b        74.4    19.5    91.6      CML323:s17a         65.2    16.4    91.8
DK888:s08b          73.8    23.4    89.4      CML247:n17a         62.0    20.6    94.4

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Check performance and CVs are listed below:

PEDIGREE            Bu/A.   H2O     %E.P.     PEDIGREE            Bu/A.   H2O     %E.P.
P32D99             169.0    19.3    94.6      P32R25             150.8    17.5    97.0
DK697              167.6    18.7    95.8      LH200.LH262        139.8    17.1    83.2
P32W86             165.5    18.9   112.1      P32K61             133.2    17.1    96.6
P31G98             159.4    16.7    95.8      HC33.TR7322.346    132.8    16.8    92.2
NK91‑R9            158.5    20.6   114.1      HC33.TR7322        130.0    15.2    91.2
G8288              152.6    18.3    96.6      CV:                 12.9     5.6     8.2

 

In addition, a group of Breeding Cross F2s were tested.  While testing F2s is a more questionable endeavor, nevertheless,

PEDIGREE            Bu/A.   H2O     %E.P.
DREP269:s06 F2     102.4    16.4    84.6
DKB844:s16 F2       98.0    19.6    86.2
CML287:s18 F2       95.0    20.7    89.0

 

look like keepers, while

PEDIGREE            Bu/A.   H2O     %E.P.
CML325:n13 F2       60.8    17.1    75.6
CML247:n18 F2       59.4    20.8    89.8
CUBA117:s15 F2      58.0    20.3    87.0

do not.

 

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We are grateful to our Cooperators for their support!

 


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