Chlorophyll degradation enzyme (i.e., chlorophyllase, Mg-dechelatase, and chlorophyll oxidase) activities of aphid-infested and uninfested ‘Tugela’ and Tugela near-isogenic wheat lines (i.e., Tugela-Dn1, Tugela-Dn2, and Tugela-Dn5) were assayed. Chlorophyllase activity was higher in bird cherry-oat aphid, Rhopalosiphum padi (L.) (Homoptera: Aphididae),-infested wheat lines compared with Russian wheat aphid, Diuraphis noxia (Mordvilko) (Homoptera: Aphididae)]-infested and uninfested plants. Mg-dechelatase activity was higher in D. noxia-infested wheat lines than in R. padi-infested and uninfested plants. Also, Mg-dechelatase activity was lower in Tugela wheat infested with D. noxia than in Tugela near-isogenic lines with Dn genes. Based on the in vitro assays of chlorophyll degradation enzyme (i.e., chlorophyllase and Mg-dechelatase) activities, we proposed that the chlorotic symptoms observed on D. noxia-infested Tugela wheat were most likely to be elicited by unbalanced chlorophyll biosynthesis and degradation.
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1 April 2004
Enzymatic Chlorophyll Degradation in Wheat Near-Isogenic Lines Elicited by Cereal Aphid (Homoptera: Aphididae) Feeding
Tao Wang,
Sharron S. Quisenberry,
Xinzhi Ni,
Vicki Tolmay
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Journal of Economic Entomology
Vol. 97 • No. 2
April 2004
Vol. 97 • No. 2
April 2004
chlorophyll oxidase
chlorophyllase
Diuraphis noxia
Mg-dechelatase
Rhopalosiphum padi