Studies on Natural Crossing and Floral Biology of Cotton (Gossypium hirsutum L.)

Pio C. Morito

Date

3-1981

Degree

Bachelor of Science in Agriculture

Major Course

Major in Agronomy

College

College of Agriculture and Food Science (CAFS)

Adviser/Committee Chair

Rodolfo P. Cabangbang

Co-adviser

Raymond F. Bader

Abstract

Studies on floral biology and outcrossing of cotton were conducted under natural field conditions on three cotton cultivars namely: Deltapine 16(L), Morado and Frego Bract, to establish some baseline informations in handling breeding lines, seed purification and seed production, and hybridization.

Some floral characters were found to differ among varieties. Deltapine 16(L) had the highest number of floral buds from acquiring to the opening of the first flower. The number of flowers bloomed per plant per day were high for both Deltapine (16(L) and Frego Bract and the duration of blooming period was shorter for both Morado and Deltapine 16(L). Frego Bract had the longest staminal tube covered with stamens. In terms of boll growth, Deltapine 16(L) and Morado took around nine days and ten days for Frego Bract to reach the boll size of 2.50 cm from the base to the tip.

The percentage outcrossing was almost zero. The results of the study clearly indicates that cotton is naturally a selfed pollinated crop. The very low population of insect pollinators and almost zero percent cross pollination demonstrated further that seed purification, seed production purpose need not to be grown in isolation provided it is well protected for insect pests that serve as pollinator.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

This document is currently not available here.

Share

COinS