Changes in bacillus thuringiensis tolerance levels due to hybridization of Bt-tolerant and susceptible silkworm populations

Begum, Hosne Ara, Hassan, Errol, Dingle, John and Alshehi, Aisha Alkhayat (2012) Changes in bacillus thuringiensis tolerance levels due to hybridization of Bt-tolerant and susceptible silkworm populations. Pakistan Journal of Scientific and Industrial Research Series B: Biological Sciences, 55 2: 101-107.

Author Begum, Hosne Ara
Hassan, Errol
Dingle, John
Alshehi, Aisha Alkhayat
Title Changes in bacillus thuringiensis tolerance levels due to hybridization of Bt-tolerant and susceptible silkworm populations
Journal name Pakistan Journal of Scientific and Industrial Research Series B: Biological Sciences   Check publisher's open access policy
ISSN 2221-6421
2223-2567
Publication date 2012-07
Sub-type Article (original research)
Open Access Status
Volume 55
Issue 2
Start page 101
End page 107
Total pages 376
Place of publication Islamabad, Pakistan
Publisher Pakistan Council of Scientific and Industrial Research
Subject 1100 Agricultural and Biological Sciences
Formatted abstract
Males and females of a Bt-tolerant mulberry silkworm (Bombyx mori L.) population were crossed with females and males of a Bt-susceptible population, to produce Bt-tolerant silkworm hybrids, and to determine the expression of the Bt-tolerance pattern in the F1 hybrids. It was observed that when a Bt-tolerant (42% larval mortality) female (BtT female) silkworm was crossed with a Bt-susceptible (85% larval mortality) male (BtS male), the resultant F1 offspring showed lower levels of Bt-tolerance (87% larval mortality). On the other hand, when a Bt-tolerant male (BtT male) was crossed with a Bt-susceptible female (BtS female), the F1 hybrid showed higher levels of Bt-tolerance (35% larval mortality) characteristic. The probit statistics showed that both hybrids expressed Bt-tolerance or susceptible levels similar to their male parents. These different patterns of Bt-tolerance in F1 hybrids might be due to the transferring of a Bt-tolerant gene, from the parents to offspring, through the homozygotic male (ZZ) silkworm.
Keyword Bacillus thuringiensis
Bombyx mori
Bt-tolerance
Hybrid performances
Insect hybridization
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Agriculture and Food Sciences
 
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