Cytoplasmic effects on quantitative characters in maize (Zea mays L.)

Area of Science:

• Plant genetics
• Agronomy
• Maize breeding

Background:

• Understanding cytoplasmic effects is crucial for maize breeding.
• Reciprocal cross analysis helps elucidate maternal inheritance patterns.

Purpose of the Study:

• To investigate reciprocal cross effects in diverse maize varieties.
• To determine the influence of genotype-cytoplasm interactions on key agronomic traits.

Main Methods:

• Field experiments with ten maize varieties and all crosses (including reciprocals).
• Split-split plot design across two locations with varying plant populations.
• Analysis of variance for traits like plant height, ear height, ear girth, and days to silk.

Main Results:

• Significant reciprocal cross effects observed for plant height, ear height, and ear girth, consistent across locations and plant densities.
• Highly significant reciprocal effects noted for days to silk.
• Cytoplasmic effects were dependent on genotype-cytoplasm interactions and more pronounced in early × late crosses.
• Early female parents reduced plant height, ear height, and days to silk.

Conclusions:

• Cytoplasmic effects on plant and ear height, and days to silk, have practical implications for maize breeding.
• Specific cytoplasm can be leveraged to develop early maturing maize varieties without compromising yield.
• The observed cytoplasmic effects on days to silk persist in subsequent generations (F2 and backcrosses).