科研之友
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摘要
Glycoalkaloids are secondary metabolites found in Solanum tuberosum L. and other members of Solanaceae, which have potential role in the defense of host against certain fungi, nematodes, herbivores and other stress conditions. This study was undertaken to investigate the possible relationship between late blight disease severity and foliar glycoalkaloids of potato cv. Desiree. Disease severity and total glycoalkaloids contents determined after 3, 6, 9 and 12 days after inoculation with Phytophthora infestans showed no relationship when compared to control. Values of total glycoalkaloids contents of potato foliage with different late blight disease severity were almost consistent with control plants, which were inoculated with sterile distilled water; although TGA levels in diseased plants showed slight but non-significant elevations than control. Results indicated that disease severity had no effect on foliar TGA concentrations; however, age of plant and length of inoculation period corresponded to higher glycoalkaloids contents and disease severity of leaves.
