Experiences in the use of testers at Kasetsart University in Thailand
Aekatasanawan, C.
Experiences in the use of testers at Kasetsart University in Thailand - Mexico, DF (Mexico) CIMMYT : 2004 - p. 176-189 - Printed
The objectives of this research were to compare S1, S1 testcrossed with low-(TC1) and high-(TC2) favorable gene testers methods in Caripeno DMR (S)C5 and Suwan 1(S)C10 populations for evaluating S1 lines, correlations among these methods, responses to selection, and general and specific combining ability of S3 lines. The testers of the TC1 and TC2 methods were Cycle 0 and the later cycle of the opposite population, respectively. Results, averaged from both populations, revealed that genetic variability among progenies were S1 > TC1, S1> TC2, and TC1 > TC2 by 2.4, 3.3, and 1.4 times for grain yield; and 2.0, 3.5, and 1.8 times for 14 agronomic traits, respectively. Correlation coefficients for grain yield were 0.521 for S1 and TC1 0.450 for S1 and TC2, and 0.498 for TC1 and TC2. The S1 method gave higher mean yield of the 10 S1 lines for high yield selection than those of the TC1 (13%) and TC2 (15%) methods. All of populations per se, interpopulation crosses, and testcrosses showed the same rank of responses to high yield selection; S1 > TC1> TC2. Compared to the inbred and hybrid checks for grain yield, the orders were TC1 (11) > S1 (10) > TC2 (9) for selecting high GCA-S3 lines, and S1 (22) > TC1 (21) > TC2 (4) for selecting significant S3 x S3 hybrids. In conclusion, the TC2 method was less efficient and the Si method was the most effective, inexpensive, and less time-consuming method.
English
970-648-116-8
Field experimentation
Genetic variation
Grain yield
Heterosis
Inbred lines
Methods
Testes
Genotypes
Hybrids
CIMMYT
Experiences in the use of testers at Kasetsart University in Thailand - Mexico, DF (Mexico) CIMMYT : 2004 - p. 176-189 - Printed
The objectives of this research were to compare S1, S1 testcrossed with low-(TC1) and high-(TC2) favorable gene testers methods in Caripeno DMR (S)C5 and Suwan 1(S)C10 populations for evaluating S1 lines, correlations among these methods, responses to selection, and general and specific combining ability of S3 lines. The testers of the TC1 and TC2 methods were Cycle 0 and the later cycle of the opposite population, respectively. Results, averaged from both populations, revealed that genetic variability among progenies were S1 > TC1, S1> TC2, and TC1 > TC2 by 2.4, 3.3, and 1.4 times for grain yield; and 2.0, 3.5, and 1.8 times for 14 agronomic traits, respectively. Correlation coefficients for grain yield were 0.521 for S1 and TC1 0.450 for S1 and TC2, and 0.498 for TC1 and TC2. The S1 method gave higher mean yield of the 10 S1 lines for high yield selection than those of the TC1 (13%) and TC2 (15%) methods. All of populations per se, interpopulation crosses, and testcrosses showed the same rank of responses to high yield selection; S1 > TC1> TC2. Compared to the inbred and hybrid checks for grain yield, the orders were TC1 (11) > S1 (10) > TC2 (9) for selecting high GCA-S3 lines, and S1 (22) > TC1 (21) > TC2 (4) for selecting significant S3 x S3 hybrids. In conclusion, the TC2 method was less efficient and the Si method was the most effective, inexpensive, and less time-consuming method.
English
970-648-116-8
Field experimentation
Genetic variation
Grain yield
Heterosis
Inbred lines
Methods
Testes
Genotypes
Hybrids
CIMMYT