San Vicente, F.M.

Performance of promising tropical late yellow inbred lines under water stress conditions - Mexico, DF (Mexico) CIMMYT : 1997 - Printed

Drought tolerance is an important and challenging breeding goal in the lowland tropics. ClMMYT's Lowland Tropical Maize Subprogram has developed a tremendous array of inbred lines with different attributes. A group of 121 promising late-yellow inbred lines was evaluated under drought at Tlaltizapan, Mexico during the winter 1994/1995 season. They were developed from different CIMMYT populations by continuous selfing, using high plant densities and non-stressed water conditions during the inbreeding process. The objective was to assess genetic variation within this set of lines. In turn, selected lines could be used in developing source germplasm, new inbred lines through recycling, and developing specific hybrid combinations. Differences (P<0.01) were detected among lines for all traits measured. Mean grain yield ranged from 4.7 to 0.2 t ha-1. For anthesis-silking interval (ASI), the range was from 6.5 to -4.5 days. The highest number of ears plant-1 was 1.6, while the lowest was 0.3. Ear aspect rating ranged from 4.8 to 1.2 (1-5 score, 5 = excellent). Phenotypic correlations indicated that an increase in grain yield under drought stress is associated with a reduction in ASI and barrenness, and better ear aspect. More than 20 lines were identified that had superior performance under drought stress conditions



Drought resistance
Drought stress
Genetic variation
Inbred lines
Resistance to injurious factors
Zea mays
Plant breeding


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