Drought tolerance screening of maize inbred lines at an early growth stage

초록

Drought is one of the major abiotic factors that have a serious effect on the production of cereals crops including maize,which is grown widely in the world. Screening based on drought facilitates selection of inbred lines and an understanding of droughttoleranttraits. The effect of drought stress and rescue after stress on maize inbred lines was investigated in this study. Different plantgrowth attributes namely plant height, leaf area and weight, stem weight, root length, shoot and root fresh and dry weight, and total leafchlorophyll content were measured. Six flint inbred lines (FLD 12, FLD 23, FLD 24, FLD 33, FLD 35, and FLD 37) were screened asdrought-tolerant lines, whereas another six flint inbred lines (FLD 01, FLD 13, FLD 16, FLD 18, FLD 29, and FLD 31) were screenedas drought susceptible lines. Growth attributes under different drought conditions were subjected to a correlation test and analysis ofvariance and showed highly significant relationships with each other. The drought effect differed with different inbred lines, indicatinga wide variability of drought response at the early growth stage of maize plants. The results obtained from this study will be useful forselecting maize inbred lines in future breeding programs for enhancing drought tolerance.

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