Abstract
Cajanus scarabaeoides (L.), Thouars, is the closest wild crop relative of cultivated pigeonpea, Cajanus cajan (L.), Millspaugh. This wild pigeonpea has several insect-resistance mechanisms, particularly to Helicoverpa armigera (Hübner). Estimated economic losses in the semi-arid tropics from H. armigera damage in pigeonpea are approximately two billion USD/year. Therefore, it is imperative to improve pest resistance in this crop. In this study, we investigated insect-resistance components in IBS 3471, a C. scarabaeoides accession, and explored the possibility of transferring resistance mechanism/s to cultivated pigeonpea. A detached leaf bioassay revealed that IBS 3471 has more effective antibiosis and antixenosis resistance mechanisms against H. armigera compared to the susceptible C. cajan variety, ICPL 87. To further investigate the antibiosis resistance mechanism, we fed H. armigera larvae a heated and non-heated artificial diet supplemented with lyophilised IBS 3471 leaf powder. Incorporation of IBS 3471 leaf powder inhibited H. armigera larval weight and delayed larval development compared to larvae reared on diet supplemented with ICPL 87 leaf powder. The putative insect-resistance compounds in C. scarabaeoides were heat-labile. Proteomic analysis revealed higher levels of potential insecticidal proteins, namely lectin and cysteine proteinase inhibitor, in wild pigeonpea compared to the cultivated variety. Nutritional analysis and interspecific hybridisation experiments also indicated that IBS 3471 is a potential candidate for improvement of insect-resistance in pigeonpea. This study demonstrates that IBS 3471 has multiple resistance mechanisms against H. armigera, and they are transferable to cultivated pigeonpea.
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Claims 7
Claim · model-written summary
IBS 3471 had more effective antibiosis and antixenosis resistance than ICPL 87.
- Taxon
- Cajanus scarabaeoides
.jpg?width=60)
Cajanus scarabaeoidest0 - Material
- IBS 3471e0
- Interactor
- H. armigera
_gusano_cogollero.png?width=60)
Helicoverpa armigerae0pest - Outcome
- antibiosis and antixenosis resistance mechanismse0
- Direction
- more effectivee0
- Comparator
- ICPL 87e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
_gusano_cogollero.png?width=500)
Verbatim
e0“IBS 3471 has more effective antibiosis and antixenosis resistance mechanisms against H. armigera compared to the susceptible C. cajan variety, ICPL 87.”
t0“Cajanus scarabaeoides”
Claim · model-written summary
IBS 3471 leaf powder inhibited H. armigera larval weight versus ICPL 87 powder.
- Taxon
- Cajanus scarabaeoidesCajanus scarabaeoidest0
- Material
- IBS 3471e0
- Treatment
- Incorporation of IBS 3471 leaf powdere0
- Interactor
- H. armigeraHelicoverpa armigerae0pest
- Outcome
- H. armigera larval weighte0
- Direction
- inhibitede0
- Comparator
- ICPL 87 leaf powdere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Incorporation of IBS 3471 leaf powder inhibited H. armigera larval weight and delayed larval development compared to larvae reared on diet supplemented with ICPL 87 leaf powder.”
t0“Cajanus scarabaeoides”
Claim · model-written summary
IBS 3471 leaf powder delayed H. armigera larval development versus ICPL 87 powder.
- Taxon
- Cajanus scarabaeoidesCajanus scarabaeoidest0
- Material
- IBS 3471e0
- Treatment
- Incorporation of IBS 3471 leaf powdere0
- Interactor
- H. armigeraHelicoverpa armigerae0pest
- Outcome
- larval developmente0
- Direction
- delayede0
- Comparator
- ICPL 87 leaf powdere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Incorporation of IBS 3471 leaf powder inhibited H. armigera larval weight and delayed larval development compared to larvae reared on diet supplemented with ICPL 87 leaf powder.”
t0“Cajanus scarabaeoides”
Claim · model-written summary
Putative insect resistance compounds in C. scarabaeoides were heat labile.
- Taxon
- C. scarabaeoidesCajanus scarabaeoidese0
- Outcome
- insect-resistance compoundse0
- Qualifier
- heat-labilee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The putative insect-resistance compounds in C. scarabaeoides were heat-labile.”
Claim · model-written summary
Wild pigeonpea had higher lectin and cysteine proteinase inhibitor levels than cultivated variety.
Verbatim
e0“Proteomic analysis revealed higher levels of potential insecticidal proteins, namely lectin and cysteine proteinase inhibitor, in wild pigeonpea compared to the cultivated variety.”
Claim · model-written summary
IBS 3471 was indicated as a candidate for improving pigeonpea insect resistance.
- Taxon
- pigeonpea
Cajanus cajane0 - Material
- IBS 3471e0
- Outcome
- potential candidate for improvement of insect-resistancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nutritional analysis and interspecific hybridisation experiments also indicated that IBS 3471 is a potential candidate for improvement of insect-resistance in pigeonpea.”
Claim · model-written summary
Authors conclude IBS 3471 resistance mechanisms are transferable to cultivated pigeonpea.
- Taxon
- cultivated pigeonpeaCajanus cajane0
- Material
- IBS 3471e0
- Interactor
- H. armigeraHelicoverpa armigerae0pest
- Outcome
- transferable to cultivated pigeonpeae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This study demonstrates that IBS 3471 has multiple resistance mechanisms against H. armigera, and they are transferable to cultivated pigeonpea.”
The same questions in other papers
botanical · Helicoverpa armigera · Cajanus scarabaeoidesPositive and negative results
1 in the opposite direction
- no effect
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.