Thrips (Thysanoptera: Thripidae) in northern Tunisian citrus orchards: population density,damage and insecticide trial for sustainable pest management     

Belaam-Kort  Imen  Mansour  Ramzi  Attia  Sabrine  Boulahia Kheder  Synda 《Phytoparasitica》2021,49(4):527-538

Phytoparasitica - Thrips (Thysanoptera: Thripidae) have been considered serious pests infesting a wide range of host plants around the world, which has also been the case for citrus trees in...  相似文献   

Functional analysis of the melanin biosynthesis genes <Emphasis Type="Italic">ALM1</Emphasis> and <Emphasis Type="Italic">BRM2</Emphasis>-<Emphasis Type="Italic">1</Emphasis> in the tomato pathotype of <Emphasis Type="Italic">Alternaria alternata</Emphasis>     

Ahmed A. Kheder  Yasunori Akagi  Hajime Akamatsu  Konomi Yanaga  Nitaro Maekawa  Hiroshi Otani  Takashi Tsuge  Motoichiro Kodama 《Journal of General Plant Pathology》2012,78(1):30-38

The tomato pathotype of Alternaria alternata (A. arborescens) produces the dark brown to black pigment melanin, which accumulates in the cell walls of hyphae and conidia. Melanin has been implicated as a pathogenicity factor in some phytopathogenic fungi. Here, two genes of the tomato pathotype for melanin biosynthesis, ALM1 and BRM2-1, which encode a polyketide synthetase and a 1,3,8-trihydroxynaphthalene (THN) reductase, respectively, have been cloned and disrupted in the pathogen. The gene-disrupted mutants, alm1 and brm2-1, had albino and brown phenotypes, respectively. The wild-type and the mutants caused the same necrotic lesions on the leaves after inoculation with spores. These results suggest that melanin is unlikely to play a direct role in pathogenicity in the tomato pathotype A. alternata. Scanning electron microscopy revealed that the conidia of both mutants have much smoother surfaces in comparison to the wild-type. The conidia of those mutants were more sensitive to UV light than those of the wild-type, demonstrating that melanin confers UV tolerance.  相似文献