There are many reports about resistance of transgenic Bt poplars to lepidopteran defoliators. Whether the poplars can resist haustellate mouth part pests and leaf-miners remains unclear. This study chose transgenic Bt...
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There are many reports about resistance of transgenic Bt poplars to lepidopteran defoliators. Whether the poplars can resist haustellate mouth part pests and leaf-miners remains unclear. This study chose transgenic Bt poplar, Populus euramericana cv. Robusta’(R-94), as the material to investigate its resistance to a haustellate mouth part pest, Hegesidemus habrus, and two leaf-miner species, Leucoptera susinella (Lepidoptera: Lyonetiidae) and Lithocolletis paslorella (Lepidoptera: Gracillariidae) in both field and laboratory. Results showed that R-94 poplar had strong resistance to H. habrus in fields. Injury rates of R-94 leaves were respectively only 1.08% in pure stands and 1.1% in mixed stands respectively, while injury rate of 107 poplar (a non-transgenic variety) was 16.3% in the mixed stands. When H. habrus was fed with R-94 leaves in laboratory, the livability of nymphae was 19.9% after 7 days of feeding. However, the livability of nymphae reached to 56.8% after 7 days of feeding with leaves of 107 poplars. When H. habrus was fed with R-94 and 107 poplar leaves together, the insects significantly preferred 107 poplar leaves to R-94 poplar ones. Besides H. habrus, R-94 poplar also showed strong resistance to two leaf-miners species. Therefore, R-94 poplar not only has strong resistance to lepidopteran pest, but also has similar resistance to haustellate mouth part pests and leaf-miners.
Wild resources of Pteroceltis tatarinowii *** investigated and morphological characteristics of leaves,fruits and seeds were measured in *** Lingyan Temple of Shandong,the trees grow in the temple and along the *** ad...
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Wild resources of Pteroceltis tatarinowii *** investigated and morphological characteristics of leaves,fruits and seeds were measured in *** Lingyan Temple of Shandong,the trees grow in the temple and along the *** addition to the two Pteroceltis tatarinowii,the average DBH and height of the other trees were 24.32 cm and 10.05 m *** stands in Miaofeng Mountain distributed only in the valley of Dishuiyan with the average DBH of 16.12 cm and average height of 11.50 *** tatarinowii could naturally reproduce in wild habitat and only a few natural reproduced seedlings were found at Lingyan *** results of variance analysis showed that there was significant difference of 9 characteristics among different individual trees of the same *** for width of fruit wing,8 morphological characteristics significantly differed among three *** difference exited in leaf length and leaf width among three *** there was no significant difference in seed and nut features between two different sources in Beijing,those characteristics of Pteroceltis tatarinowii from Beijing source were obviously different with those from *** seeds from Shandong were the smallest and *** was distinctness in morphological quality characteristics from different trees.
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