Transgenic rice plants that over-express the mannose-binding rice lectin have enhanced resistance to rice blast |
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Authors: | Akira Shinjo Yuko Araki Ko Hirano Tsutomu Arie Masashi Ugaki Tohru Teraoka |
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Institution: | (1) Laboratory of Plant Pathology, Graduate School of Agriculture, Tokyo University of Agriculture and Technology (TUAT), Fuchu, Tokyo 183-8509, Japan;(2) Bioscience and Biotechnology Center, Nagoya University, Chikusa, Nagoya Aichi, 464-8601, Japan;(3) Laboratory of Bioresource Technology, Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa Chiba, 277-8562, Japan; |
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Abstract: | Mannose-binding rice lectin (MRL), which is almost identical to the salt-induced protein SalT, binds to mannose and glucose
residues. Expression of the MRL gene in response to infection with Magnaporthe oryzae, the rice blast fungus, was stronger in the incompatible interaction than in the compatible. Transgenic rice plants that
constitutively over-expressed MRL strongly suppressed the growth of invasive hyphae of the fungus on leaf sheaths and the
development of typical susceptible-type lesions on leaf blades, but did not affect penetration by the fungus in comparison
with the wild-type. On a polycarbonate plate, purified recombinant MRL inhibited conidial attachment and appressorium formation
but not conidial germination. These results suggest that MRL may play an essential role in disease resistance by suppressing
development of M. oryzae in situ. |
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