Identification of Drought Tolerance in Maize Inbred Lines Popularized in South-West of China

摘要

Per plant kernel yield was investigated with 57 maize inbred lines popularized in southwest China under drought conditions that soil moisture was regulated to a little more than wilting coefficient with a plastic roof to prevent rainfall and drought tolerance coefficient was calculated for each line based on the relative difference of per plant seed yield between drought treatment and normally irrigated contrast. 81565 was the most drought tolerant and the second rate was found with N87-1, R09, 9635,9651, Nan21-3, TF1 and 5003. 15 morphological, physiological and biochemical indexes about drought tolerance during seedling and grown up stages were investigated with 12 inbred lines of different drought tolerance identified from the 57 experiment inbred lines, drought tolerance coefficients of these indexes were calculated as above and multiple regression analysis was made with drought tolerance coefficient of per plant kernel yield. The results indicated that the product of drought tolerance coefficients of seedling emergence rate and biological yield could be used as an index for drought tolerance identification of inbred lines during seedling stage and drought tolerance identification during grown up period should depend on the coefficients of plant height, anthering and silking interval, leaf emergence speed and root weight.