Abstract
This research was undertaken to evaluate five cycles of modified mass selection to improve grain yield in synthetic corn (Zea mays L.) variety IPA-5018. The selection was carried out in spring and fall seasons, during, 2013-2015 using 10% selection intensity. The five populations obtained after selection and the original population were evaluated. The experimental design was a randomized complete block design with five replications. The results were revealed a significant differences among selection cycles in grain yield and some yield components. The cycle five produced highest grain yield (9699.30 kg.ha-1) and increased 34.88% to the original population. The regression of grain yield, number of grains.ear-1 and grain weight to selection cycles were significantly linear and R2 more than 80%. We concluded that the modified mass selection could be used successfully in improving the grain yield and some yield components of corn synthetic varieties.
Highlights
Corn is an important food crop in the world
Mass selection was the oldest and the simplest breeding systems, and it is generally applied on an individual basis for the improvement of population for specific trait, and this method could be effective for selection of the traits that can be identified before or at the time of flowering
Mass selection is the simplest and inexpensive because as common method for population improvement in cross pollinated crops, and this method could be more effective for selection of the traits that can be identified before or at the time of flowering
Summary
Corn is an important food crop in the world. Dent corn that is a special corn type can be used as food in several countries and animal feed. أظهرت النتائج وجود فروقات معنوية بين الدو ارت الانتخابية الخمسة والمجتمع الاصمي في حاصل الحبوب.بخمسة مكر ارت Modified mass selection for prolificacy and ear length has been used effectively for yield improvement in corn [13,17].
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