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De-Liang Peng

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De-Liang Peng
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De-Liang Peng

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    Occurrence, identification and phylogenetic analyses of cereal cyst nematodes (Heterodera spp.) in Turkey
    (Elsevier, 2017) Jiang-Kuan Cui; Huan Peng; Shiming Liu; Erginbas Orakci, G.; Imren, M.; Dababat, A.A.; De-Liang Peng
    Publication
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    Cereal cyst nematodes: a complex and destructive group of Heterodera species
    (American Phytopathological Society (APS), 2017) Smiley, R.W.; Dababat, A.A.; Sadia, I.; Jones, M.; Tanha Maafi, Z.; De-Liang Peng; Subbotin, S.; Waeyenberge, L.
    Small grain cereals have served as the basis for staple foods, beverages, and animal feed for thousands of years. Wheat, barley, oats, rye, triticale, rice, and others are rich in calories, proteins, carbohydrates, vitamins, and minerals. These cereals supply 20% of the calories consumed by people worldwide and are therefore a primary source of energy for humans and play a vital role in global food and nutrition security. Global production of small grains increased linearly from 1960 to 2005, and then began to decline. Further decline in production is projected to continue through 2050 while global demand for these grains is projected to increase by 1% per annum. Currently, wheat, barley, and oat production exceeds consumption in developed countries, while in developing countries the consumption rate is higher than production. An increasing demand for meat and livestock products is likely to compound the demand for cereals in developing countries. Current production levels and trends will not be sufficient to fulfill the projected global demand generated by increased populations. For wheat, global production will need to be increased by 60% to fulfill the estimated demand in 2050. Until recently, global wheat production increased mostly in response to development of improved cultivars and farming practices and technologies. Production is now limited by biotic and abiotic constraints, including diseases, nematodes, insect pests, weeds, and climate. Among these constraints, plant-parasitic nematodes alone are estimated to reduce production of all world crops by 10%. Cereal cyst nematodes (CCNs) are among the most important nematode pests that limit production of small grain cereals. Heavily invaded young plants are stunted and their lower leaves are often chlorotic, forming pale green patches in the field. Mature plants are also stunted, have a reduced number of tillers, and the roots are shallow and have a “bushy-knotted” appearance. CCNs comprise a number of closely-related species and are found in most regions where cereals are produced.
    Publication
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    First report of sugar beet nematode, Heterodera schachtii Schmidt, 1871 (Nemata: Heteroderidae) in sugar beet growing areas of Sanliurfa, Turkey
    (Türkiye Entomoloji Derneği, 2016) Jiang-Kuan Cui; Erginbas Orakci, G.; Huan Peng; Wen-Kun Huang; Shiming Liu; Fen Qiao; Elekcioglu, I.H.; Imren, M.; Dababat, A.A.; De-Liang Peng
    The sugar beet nematode, Heterodera schachtii, is the major pest of sugar beet and causes serious yield losses of about 10-70%. Heterodera schachtii occurs in more than 50 countries and regions, however, there has be limited investigation of H. schachtii in Turkey. Therefore, a survey of H. schachtii in the sugar beet producing regions of Şanlıurfa was conducted in 2014 and 2015 growing seasons. Using morphological and molecular methods, 12 samples collected from three districts, Bozova, Karaköprü and Siverek, in Şanlıurfa Province, Turkey, were identified as H. schachtii. In pathogenicity test, the seedling emergence was delayed and reduced, the seedlings were stunted and necrotic, and the white females of H. schachtii were evident 25 days after inoculation. Phylogenetic analyses were also conducted. The 12 H. schachtii populations from Şanlıurfa Province clustered together with populations from Europe and Morocco at the value of 99%. Sugar beet is the second largest crop in Turkey with the annual production of more 16 Mt. To our best knowledge, this is the first report of H. schachtii in Şanlıurfa Province of Turkey.
    Publication