Assessment of inheritance pattern and agronomic performance of transgenic rapeseed having harpin Xooc-encoding hrf2 gene.
hrf2 gene is a member of the harpin-encoding gene family of rice-pathogenic bacterium Xanthomonas oryzae pv. oryzicola. In our previous studies, we observed that harpin(Xooc) could elicit hypersensitive cell death in non-host plants, induce disease and insect resistance in plants, and enhance plant growth. In this study, the rapeseed cultivar, Yangyou 4, was genetically engineered via Agrobacterium-mediated transformation to express the hrf2 gene. Polymerase chain reaction (PCR) and southern blot analyses of T(1) generation of transgenic rapeseed revealed stable integration and expression of the inserted gene hrf2. In addition, the resistance to Sclerotinia sclerotiorum was greatly enhanced. A comparison between agronomic characters of transgenic and control lines displayed significant differences in terms of plant height, stem width, number of pods per plant, number of seeds per pod, 1,000-seed weight, and seed yield per plant. Among lines with resistance to S. sclerotiorum, T(1)1 had improved agronomic traits compared with controls with a 22.7% seed yield increase. These results suggest that the introduction of the hrf2 gene into rapeseed can be an effective strategy for enhancing resistance to S. sclerotiorum.
Huo
Rong
R
Department of Plant Pathology, College of Plant Protection, Key Laboratory of Monitoring and Management of Crop Diseases and Pest Insects, Ministry of Agriculture, Nanjing Agricultural University, 210095, Nanjing, People's Republic of China.
Wang
Yu
Y
Ma
Ling-Li
LL
Qiao
Jun-Qing
JQ
Shao
Min
M
Gao
Xue-Wen
XW
D016960:Agrobacterium tumefaciens / Q000235:genetics; D001203:Ascomycota / Q000502:physiology; D001425:Bacterial Outer Membrane Proteins / Q000235:genetics* / Q000502:physiology; D029688:Brassica napus / Q000235:genetics* / Q000254:growth & development / Q000382:microbiology / Q000502:physiology; D018556:Crops, Agricultural / Q000235:genetics; D018744:DNA, Plant / Q000032:analysis / Q000235:genetics; D005822:Genetic Vectors / Q000235:genetics; D007113:Immunity, Innate; D010935:Plant Diseases / Q000235:genetics / Q000382:microbiology / Q000517:prevention & control; D030821:Plants, Genetically Modified / Q000235:genetics* / Q000382:microbiology / Q000502:physiology; D014974:Xanthomonas / Q000235:genetics*
D001425:Bacterial Outer Membrane Proteins; D018744:DNA, Plant; C075462:harpin protein, Erwinia amylovora