Mango leafhopper reproduction: an instinct to be in synch

Issue Date

10-2011

Abstract

The study was conducted to look into the role of mango flowers in the ovarian development of I. clypealis. The research problem was addressed by generating quantitative evidence of the synchrony of insect reproduction and flower development at the population and individual levels and experimentally tested the hypothesis that the stage of mango flower development affects I. clypealis ovarian development. The age composition of I. clypealis population at different stages of mango inflorescence varied. Stages 1 to 6 were characterized by high proportion of young-age leafhoppers classes, whereas stages 7 to 10 had low proportions. I. clypealis ovarian development is manifested primarily by the morphological changes of the ovarioles and the growth of oocytes. Early stage of ovarian development is characterized by threadlike ovarioles and underdeveloped germaria; vitellaria become recognizable and enlarge as the oocytes grow and mature. Moreover, as oocytes develop size increases and capacity becomes more significant. Ovarian development in I. clypealis seemed to be long since it took 16 days before chorionated eggs were observed. However, this observation was confined to only 6.67% of the P1 stage sample, thus further verification is suggested. The effect of mango inflorescence stages mon the ovarian development of I. clypealis differed significantly across time. However, it has very limited biological implication. Interestingly, ovarian development rate of I. clypealis fed with shoots increased over time, indicating that it also supports reproductive development. The fat body content of I. clypealis differed significantly over time but no trend was observed. Correlation analysis showed that there was no linear relationship between the ovarian development and fat body of I. clypealis fed with late pre-anthesis, anthesis, and post-anthesis inflorescence. However, I. clypealis fed with early pre-anthesis inflorescence and shoots have very strong and moderate positive linear association between ovarian development and fat body, respectively.

Source or Periodical Title

Philippine Entomologist

ISSN

0048-3753

Volume

25

Issue

2

Page

215

Document Type

Article

Frequency

semi-annually

Language

English

En – AGROVOC descriptors

IDIOSCOPUS CLYPEALIS; INFLORESCENCE; PLANT REPRODUCTIVE ORGANS; OVA; INSECT EGGS; ANIMAL REPRODUCTION

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