Morphological and cytological characterization of tigbi (Coix lacryma-jobi L.) collected from Isabela, Philippines.

Noria P. Adam

Date

4-2002

Degree

Bachelor of Science in Biology

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Merlyn S. Mendioro

Abstract

Ten accessions of tigbi, Coix laoyma-jobi L. collected from five locations of Isabela were studied morphologically and cytologically. Vegetative characters and seed descriptions were considered. Plant height while flowering ranged from 64 to 79.8 cm. Number of tillers ranged from 5 to 18 tillers per plant. The number of leaves per plant ranged from 15 to 17.6. Leaf length and width at the top, middle, and bottom portions of the plant were measured. The ranges for the top leaf were 12.1 to 18.5 cm in length and 1.3 to 1.8 ern in width. For the middle leaf the ranges were 22.9 to 30.3 cm. for the length and 3.1 to 3.7 cm. for the width, and for the bottom leaf the ranges were 31.7 to 37.8 cm. for the length and 2.6 to 3.1 cm. for the width. The seed length of Job's tears ranges from 12.1 to 20 mm. while seed width ranges from 9.2 to 14.1 mm. Chromosome number of tigbi is 2n = 20. Ten bivalents were observed in diakinesis. No other chromosome association was noted at this stage. Some of the chromosomes move slowly to the metaphase plate, which resulted to some lagging chromosomes at Metaphase I. Cells with normal Metaphase I ranged from 90 to 100%. No cells were observed at Anaphase I.. Telophase 1 was normal (100%). Normal Metaphase II ranged from 92.3 to 100 %. No Anaphase II was noted and Telophase II was 100% normal. The highly normal meiosis was reflected in the plant's pollen fertility, which ranged from 85 to 98%.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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