Cytogenetics of the mango leafhopper, Idioscopus clypealis (Lethierry) (Hemiptera: Cicadellidae)

Abstract

The chromosome number and meiotic index of the mango leaf hopper, Idioscopus clypealis (Lethierry), were determined and the chromosome behavior at various stages of meiosis was analyzed. Based on chromosome counts done on 40 meiocytes at diakinesis, 75% of the meiocytes had a haploid chromosome number of 10 (n = 10) and 25% had a haploid chromosome number of 9 (n = 9). The chromosomes were holocentric, bivalent and appeared as thick, darkly stained bodies with an average relative length of 0.54 (range = 0.23 to 1.00 at pachytene). Average meiotic index of I. clypealis was 89.7% (range = 85% to 94%); meiotic chromosomal behavior was relatively normal. The centromeric index was no longer investigated due to the holocentric behavior of the chromosomes. Clumping of chromosomes was observed at metaphase I (63%) and metaphase II (30%) and bridge formation at anaphase I (31%). The frequency of chromosomal abnormalities decreased as meiosis progressed.

Source or Periodical Title

Philippine Agricultural Scientist

ISSN

317454

Page

468-472

Document Type

Article

Subject

Cytogenetics, Cytology, Idioscopus clypealis, Karyomorphology, Mango, Mango leafhopper

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