Morphological and biochemical aspects of okra (Abelmoschus Esckentus [L.] Moench) resistance to the cotton leafhopper (Amrasca Biguttula [Ishida]

Issue Date

4-1996

Abstract

Length and density of trichomes and leaf surface toughness were significantly greater in the moderately resistant okra Accession 12, leaf thickness and number of trichome branches dis not differ significantly, while midrib width was significantly narrower in the susceptible variety Smooth Green. Both varieties have branched, unbranched and non-glandular leaf trichomes. Total free sugar, starch, fat and protein were the variable components with total free sugar being consistently and significantly higher in Smooth Green. There was a significant negative correlation between trichome length/density and number of leafhopper eggs deposited, nymphs emerged, adults attracted to the host plant, amount of sap ingested or weight of honeydrew excreted. Conversely, total free sugar content of the host was positively correlated with attractiveness to the adult leafhopper, insect fecundity, number of nymphs emerged, amount of sap ingested and weight of honeydrew excreted. The long dense leaf trichomes probably impeded feeding and egg deposition. The greater amount of readily utilizable free sugar may explain partly the greater attraction of fecundity of the hoppers on Smooth Green. As a follow-up, the total free amino acid contents of the two varieties should be compared.

Source or Periodical Title

The Philippine Entomologist

ISSN

0048-3753

Volume

10

Issue

1

Page

35-56

Document Type

Article

Frequency

semi-annually

Physical Description

tables; graphs; pictures

Language

English

En – AGROVOC descriptors

ABELMOSCHUS ESCLENTUS; AMRASCA BIGUTTULA; HOST PLANT RESISTANCE; PEST RESISTANCE; TRICHOMES

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