Cells and mitotic chromosomes of rice stemborers Scirpophaga incertulas (Walker) and Scirpophaga innotata (Walker) Lepidoptera: Pyralidae

Date

3-1992

Degree

Bachelor of Science in Biology

Major Course

Major in Cell Biology

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Adelina A. Barrion

Abstract

The M-phases of the rice stem borers which consisted mainly of three long stages and the premetaphase stages were revealed by the egg cells of the yelow stem borer. Sciponhaga incertulas (Wlk) and the bird larval instar of white stem borer S. innotata (Wlk). the two species distinct variations in the shape in the diameter of the prophase cells. A wide range of chromosome numbers were observed. S. insertulas had 2n = 13 to 34 chromosomes while S. innotata had 2n = 23 to 92 chromosomes. The modal diploid chromosome number number (2n) of s. insertulas was 22 whereas that of S. innotata was 38. The chromosomes of the two stemborers were holokinetic or their chromosomes were difused. The mean relative of the sizes of S. insertulas range from 0.62 to 0.73 whereas those of S. innotata ranged from 0.47 to 2.82.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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