Progress in breeding for low nitrogen and drought stress in Thailand
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TextPublication details: Los Baños, Laguna (Philippines) PCARRD : 2000Description: p. 218-231Subject(s): Summary: The project of maize breeding for tolerance to low N was established at NSW FCRC in 1995 with the objectives of developing inbred lines, hybrids and populations tolerant to low N. A block of land of approximately 0.7 ha was used as a testing block for low N tolerance. Before using the block, two successive crops of maize were planted with no fertilizer in 1995 early rainy season (ER) and 1995 late rainy season (LR) to create the low N condition. The evaluation for tolerance to low N was started in 1996ER. The breeding scheme used was screening of inbred lines and early generation lines from NSW FCRC hybrid maize development project and the selected lines recombined into a population (NSLNIC) which will be used as a source population for tolerance to low N. These selected lines were also crossed with two elite inbred lines Nei 9202 and Nei9008 and then the top cross hybrids were evaluated under low N condition. In conclusion, twenty three top cross hybrids were selected based on tolerance to low N and will be tested in various environments in 1998 ER. Breeding for drought stress tolerance was initiated in 1977. The objectives of this project are to develop inbred lines, hybrids and populations for tolerance to drought stress. Two populations namely KK-DR(S)C5 and NS-DR(S2)Cl were developed using SI and S2 recurrent selection, respectively. The S 1 and S2 progenies were evaluated both under artificial stress and normal water conditions during cycles of the population improvement and the tolerant progenies were selected based on a drought index plus some other important agronomic traits under stress condition such as anthesis and silking interval, number of ears per plant, wilt score and shelling percentage, etc. Three synthetic varieties were developed from each of the two populations. Commercial hybrids and inbred lines evaluations for drought stress tolerance were also conducted. There were approximately 150 topcross hybrids developed from the selected tolerant lines crossing with 2 elite inbred lines Nei 9202 and Nei 9008 and these top cross hybrids will be evaluated for tolerance to drought during the 1998 dry season. There were at least 2-3 sets of drought and low N trials received from CIMMYT each year for evaluation of the stress tolerance of inbred lines and hybrid maize.
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The project of maize breeding for tolerance to low N was established at NSW FCRC in 1995 with the objectives of developing inbred lines, hybrids and populations tolerant to low N. A block of land of approximately 0.7 ha was used as a testing block for low N tolerance. Before using the block, two successive crops of maize were planted with no fertilizer in 1995 early rainy season (ER) and 1995 late rainy season (LR) to create the low N condition. The evaluation for tolerance to low N was started in 1996ER. The breeding scheme used was screening of inbred lines and early generation lines from NSW FCRC hybrid maize development project and the selected lines recombined into a population (NSLNIC) which will be used as a source population for tolerance to low N. These selected lines were also crossed with two elite inbred lines Nei 9202 and Nei9008 and then the top cross hybrids were evaluated under low N condition. In conclusion, twenty three top cross hybrids were selected based on tolerance to low N and will be tested in various environments in 1998 ER. Breeding for drought stress tolerance was initiated in 1977. The objectives of this project are to develop inbred lines, hybrids and populations for tolerance to drought stress. Two populations namely KK-DR(S)C5 and NS-DR(S2)Cl were developed using SI and S2 recurrent selection, respectively. The S 1 and S2 progenies were evaluated both under artificial stress and normal water conditions during cycles of the population improvement and the tolerant progenies were selected based on a drought index plus some other important agronomic traits under stress condition such as anthesis and silking interval, number of ears per plant, wilt score and shelling percentage, etc. Three synthetic varieties were developed from each of the two populations. Commercial hybrids and inbred lines evaluations for drought stress tolerance were also conducted. There were approximately 150 topcross hybrids developed from the selected tolerant lines crossing with 2 elite inbred lines Nei 9202 and Nei 9008 and these top cross hybrids will be evaluated for tolerance to drought during the 1998 dry season. There were at least 2-3 sets of drought and low N trials received from CIMMYT each year for evaluation of the stress tolerance of inbred lines and hybrid maize.
English
0208|AGRIS 0201|AL-Maize Program|R01PROCE
Juan Carlos Mendieta
CIMMYT Publications Collection