Characterization of the Impact of Wheat Stem Sawfly, Cephus cinctus Norton, on Pigment Composition and Photosystem II Photochemistry of Wheat Heads
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چکیده
Impact of the wheat stem sawßy, Cephus cinctus Norton (Hymenoptera: Cephidae), feeding injury on chlorophyll content and photosystem II (PSII) photochemistry in heads of wheat, TriticumaestivumL., at the grain-Þlling developmental stagewas evaluated by biochemically assessing the total chlorophyll, chlorophyll a (Chla), chlorophyll b (Chlb), chlorophyll a/b ratio (Chla/b), and carotenoid concentrations in the glumes in combination with a chlorophyll a ßuorescence test. C. cinctusÐinfested stems had altered head glume pigment composition and photochemistry. Chlorophyll content, Chla, Chlb, Chla/b, and total chlorophyll, and the photochemical efÞciency of PSII were greater for glumes of heads developing on infested stems. Chlorophyll a ßuorescence was also affected byC. cinctus. In this study,wheat plants in a controlled environmentwere able to compensate for injury imposed by C. cinctus. The mechanism underlying the compensatory processes seems to involve the alteration of wheat head physiology. Based on our results, either the photochemical efÞciency of heads on infested stems was greatly improved or their senescence was delayed.
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