Influence of phototropic response of spore germ tubes on infection process inColletotrichum lagenarium andBipolaris oryzae |
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Authors: | Sayed Zahirul Islam Yuichi Honda |
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Institution: | (1) Faculty of Life and Environmental Science, Shimane University, 690 Matsue, Japan |
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Abstract: | The germ tubes ofColletotrichum lagenarium showed negative phototropism to UV-blue (300–520 nm) and far-red (>700 nm) regions with maximum in the near ultraviolet (NUV)
region, while monochromatic radiations of 575–700 nm (yellow-red region) induced positive phototropism with maximum in the
red region. Green light (520–575 nm) was ineffective. Negative phototropism-inducing wavelength regions inhibited germ tube
growth and positive phototropism-inducing wavelength regions promoted it significantly.Bipolaris oryzae did not show any phototropic response and light did not affect the germ tube growth. These results indicate that the lens
effect, in combination with the light growth reaction and light growth inhibition, is the mechanism of the phototropism of
germ tubes ofC. lagenarium. NUV radiation, which induced negative phototropism ofC. lagenarium, promoted appressorium formation, while red light, which induced positive phototropism, suppressed it significantly. In the
case ofB. oryzae, light did not affect the infection structure formation. These results indicate that negative phototropism of germ tubes
ofC. lagenarium favors the infection process by facilitating the contact of the tips of germ tubes with the host surface, while positive
phototropism has the opposite effect. |
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Keywords: | Bipolaris oryzae Colletotrichum lagenarium germ tube growth infection structure phototropism |
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