Effects of gamma radiation on the testis of corn earworm Helicoverpa armigera

Date

3-1998

Degree

Bachelor of Science in Biology

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Pablo P. Ocampo

Abstract

The effects of gamma radiation on some reproductive parameter of male corn earworm were evaluated. Male pharates were subjected to gamma radiation doses of 100 and 150 Grey. A group of irradiated insects were allowed to develop and the adult test group was obtained. The remaining adults were allowed to mate with normal females and their F1 progenies were collected. The testis of the normal and irradiated pharates, emerged adults, and their F1 larval progenies were obtained and histologically examined. It was found that the spermatogonia are the most radiosensitive among the different cell types observed in the testis. This pattern was much exemplified among pupae evaluated immediately after irradiation. The mean values observed on the spermatogonia were 112.2, 55.3, and 46.6 for control, 100 Gy, and 150 gy, respectively. In all test groups examined, the spermatogonia were found to have reduced number and sizes due to the radiation treatment. The cells atrophied in the irradiated insects. Significant variations in the number and sizes of cells and cell bundles among test groups were consistently observed in the primary and secondary spermatocytes, and spermatids. Although e apyrene sperm slightly atrophied in the adults and F1 progenies, the spermatozoa were still found to be the most resistant to radiation treatments.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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