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Alterations by a defect in a rice G protein α subunit in probenazole and pathogen-induced responses (2004)

KOMATSU, S. ; YANG, G. ; HAYASHI, N. ; [et al.]

Oxford, UK : Blackwell Science Ltd

Plant, cell & environment 27 (2004), S. 0

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ISSN: 1365-3040

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Biology

Notes: The rice dwarf1 (d1) mutant, which is deficient in an α subunit (Gα) of heterotrimeric G protein, was used to obtain specific evidence on the functions of Gα protein in defence signalling in rice. Using proteome analysis, a probenazole-inducible protein (PBZ1) was detected in the cytosolic fraction of leaf blade of the wild type, but not the d1 mutant. After treatment with probenazol, PBZ1 reached maximal levels at 72 h in the wild type but 96 h in the d1 mutant. The induction of PBZ1 by probenazole treatment was inhibited by protein kinase inhibitors. A 48-kDa putative mitogen-activated protein kinase (MAPK) and a 55-kDa putative Ca2+-dependent protein kinase (CDPK) showed lower activities in the cytosolic fraction of the d1 mutant than that of the wild type. The activities of these protein kinases were enhanced at 24 h in the wild type and 48 h in the d1 mutant after probenazole treatment. Although the d1 mutant responded to the rice blast fungus similarly to the wild type, the d1 mutant developed rice blight symptoms earlier than the wild type when infected with Xoo. In addition, the blight symptoms were more severe on the mutant than on the wild type, and wilting was frequently observed in the d1 mutant. Furthermore, induction by the bacterial infection of the 48-kDa putative MAPK and PBZ1 was delayed by 2 and 4 d, respectively, in the d1 mutant compared with the wild type. These results indicate that the Gα protein plays a role in the induction of PBZ1 and protein kinases by probenazole and Xoo, and suggest that the 48-kDa putative MAPK may be involved in a signalling pathway for resistance to bacterial infection.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1365-3040.2004.01202.x

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Effect of Tin Addition on Phase Constitution and Heat Treatment Behavior in Ti-40Ta-Sn Alloys (2004)

Ikeda, Masahiko ; Komatsu, S. ; Nakamura, Yuichiro ; [et al.]

s.l. ; Stafa-Zurich, Switzerland

Materials science forum Vol. 449-452 (Mar. 2004), p. 1273-1276

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ISSN: 1662-9752

Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: Using Ti-40mass%Ta-0, -4, -8 and -12mass%Sn alloys, the effect of Sn addition on phaseconstitution in the solution treated and quenched state and isochronal heat treatment behavior isstudied by electrical resistivity and Vickers hardness measurements and X-ray diffactometry. Toconfirm shape memory effect of some of these alloys, shape-recovery test was also performed.Orthorhombic martensite, [removed info] was identified in Ti-40Sn-0 to 8Sn alloy quenched from 1173K, while[removed info] phase was identified in STQed Ti-40Ta-12Sn alloy. On isochronal heat treatment, increases ofresistivity at LN and resistivity ratio were observed in only 8Sn alloy, because these increases aredue to reverse-transformation of [removed info] to [removed info] phase. From result of shape recovery test, shape memoryeffect was observed in Ti-40Ta-4 and 8Sn alloys