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High-throughput, Microscale Protocol for the Analysis of Processing Parameters and Nutritional Qualities in Maize (Zea mays L.)
Published on: June 16, 2018
Roles of carbohydrate supply and phytohormones in maize kernel abortion
1Monsanto Agricultural Company, Mail Code GG5A, St. Louis, Missouri 63198.
Plant Physiology
|November 1, 1989
Summary
Maize ear tip kernel abortion is not caused by low carbohydrates but may be influenced by abscisic acid (ABA) after the process begins. This impacts corn yield.
Area of Science:
- Plant Physiology
- Agricultural Science
- Crop Science
Background:
- Maize (Zea mays L.) ear tip kernel abortion leads to significant yield losses.
- The causes of kernel abortion are debated, with theories including carbohydrate deficiency or hormonal signals.
Purpose of the Study:
- To investigate if carbohydrate supply or hormonal signals initiate maize ear tip kernel abortion.
- To differentiate between carbohydrate and hormonal influences on kernel abortion during flowering.
Main Methods:
- Maize plants were subjected to shading during flowering to induce kernel abortion.
- Nonstructural carbohydrates, indoleacetic acid (IAA), abscisic acid (ABA), and cytokinins were quantified in aborting and nonaborting kernels.
- Measurements were taken before and after the abortion process was complete.
Main Results:
- Kernel abortion initiated by 8 days after anthesis (DAA) and completed by 12 DAA.
- Carbohydrate concentrations (sugars, starch) did not differ significantly between aborting and nonaborting kernels until after 12 DAA.
- Higher carbohydrate levels were found in the cob of aborting kernels, suggesting impaired sugar transfer.
- Hormonal differences (IAA, ABA, cytokinins) were only detected after abortion was complete.
Conclusions:
- Maize kernel abortion is not initiated by a lack of carbohydrates.
- Impaired sugar transfer from the cob to the kernels may play a role early in abortion.
- Hormonal signals, particularly abscisic acid (ABA), might promote abortion after it has been initiated.
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