Morphology and cytogenetics of Teosinte (Gr 021), Maize (IPB var. I) and their F1 reciprocal crosses

Date

3-1986

Degree

Bachelor of Science in Biology

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Liwayway M. Engle

Co-adviser

Merlyn S. Mendioro

Abstract

The selected botanical data of teosinte (Gr021), maize (IPB var I) and their F1 reciprocal crosses were gathered and analyzed statistically. The parents can easily be distinguished from the hybrids by the tillering habit and the appearance of the pistillate spikelets, among others. Comparison of reciprocal hybrids showed that teosinte x maize hybrids have higher quantitative characters like plant height; leaf length and width; internode length and diameter etc. Quantitatively, the hybrids can also be identified by their ligule type. In maize x teosinte hybrids, 75% possessed broad crescent ligule while only about 50% was noted in the reciprocal cross. Both observations suggest the possibility of cytoplasmic effects. Chromosomes of teosinte (Gr021) had knobs which were more numerous than in maize (IPB var I). The chromosomal behavior of the parents was normal. However, hybrids exhibited some abnormal chromosomal behaviors. These were (1) loose pairing, (2) cross configuration in pachynema indicating the occurrence of reciprocal translocation, (3) the presence of univalents in diakinesis, (4) late migrating univalents

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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