Evaluation of drought resistance in maize genotypes using proline accumulation as an Index
1992
Tawat Ruangsopon
Study on proline accumulation as a drought resistance index in maize was conducted at the National Corn and Sorghum research Center, Pak Chong, Nakhon Ratchasima Province during January, 1989 to October, 1990. The main objectives were to measure the proline accumulation, growth, yield and yield components under various water regimes for evaluation of drought resistance in maize genotypes. Under soil moisture of 25 % AWC, all maize genotypes accumulated a high concentration of proline eventhough there were different among genotypes and it was classified into three groups; high, medium and low content of proline accumulation. The proline contents were correlated with the value of consumptive use of water and the stem fresh weight at 21 days of age. Two maize cultivars from each group of proline accumulation were grown in the field under 4 water stress regimes. Water stress caused grain yield reduction with a pronounced effect when stress occurred during stages 3-6 and 9-12 weeks after emergence. Furthermore, maize cultivars expressed the different abilities of resistance to various water stressed regimes. The maize cultivars, which were in the high proline accumulation group, gave low grain yield while contrast to the maize cultivars, which were in the low proline accumulation group. The leaf proline accumulation at seedling stage could be used as drought resistance index for maize genotypes evaluation. This correlation was, however, in a negative manner.
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