Symptom Development of the Resinous Stem Canker Caused by Inoculation with Cistella japonica onto Chamaecyparis obtusa

1999 ◽  
Vol 4 (2) ◽  
pp. 177-182 ◽  
Author(s):  
Yasuo Suto ◽  
Daisuke Ougi
Keyword(s):  
Stem Canker ◽  
Chamaecyparis Obtusa ◽  
Symptom Development ◽  
Resinous Stem Canker

Seasonal Variation in Traumatic Resin Canal Formation in Chamaecyparis Obtusa Phloem

IAWA Journal ◽  
1998 ◽  
Vol 19 (2) ◽  
pp. 181-189 ◽  
Author(s):  
Keiko Kuroda
Keyword(s):  
Annual Ring ◽  
Stem Canker ◽  
Chamaecyparis Obtusa ◽  
Resin Canal ◽  
Annual Rings ◽  
Secondary Phloem ◽  
Resinous Stem Canker ◽  
Traumatic Resin Canals ◽  
Resin Canals ◽  
Artificial Wounding

Trunks of Chamaecyparis obtusa were injured to examine seasonal differences in traumatic resin canal formation in secondary phloem. Even after wounding during winter, differentiation of axial parenchyma into epithelium was initiated, and vertical resin canals formed. After winter wounding, resin canal development was slower and the tangential extent of resin canals was narrower than after spring wounding, and it took one to two months until resin secretion began. After spring wounding, the sites of resin canal formation were the 1- and 2-year-old annual rings of phloem. In August, the location of resin canal formation shifted into the current and 1-year-old annual ring. Resin canals never formed in secondary phloem areas that were 3 or more years old. In C. obtusa trunks that are affected by the resinous stem canker, numerous tangentiallines of resin canals are found throughout the phloem, not just recent and 1- to 2-year-old phloem. The present research indicates that these many lines of resin canals were not formed at one time, and that the stimuli that induce traumatic resin canals must occur repeatedly over many years. The data on artificial wounding effects are useful for understanding resinous stem canker.

Seasonal resin canal formation and necroses expansion in resinous stem canker-affected Chamaecyparis obtusa

2002 ◽  
Vol 32 (4-5) ◽  
pp. 213-224 ◽  
Author(s):  
T. YAMADA ◽  
M. NAGASHIMA ◽  
C. KAWAGUCHI ◽  
K. OOTSUKI ◽  
N. YANAGITA
Keyword(s):  
Stem Canker ◽  
Chamaecyparis Obtusa ◽  
Resin Canal ◽  
Resinous Stem Canker

scholarly journals Distinction of resin compounds between the healthy bark and the resinous stem canker of Thujopsis dolabrata var. hondae

2003 ◽  
Vol 49 (6) ◽  
pp. 548-552 ◽  
Author(s):  
Nobuyasu Hanari ◽  
Hiroshi Yamamoto ◽  
Ken-ichi Kuroda
Keyword(s):  
Stem Canker ◽  
Resinous Stem Canker

Infection of different plant parts of soybean seedlings by southern Diaporthe phaseolorum and its role in the development of stem canker symptoms

1987 ◽  
Vol 65 (10) ◽  
pp. 2104-2108 ◽  
Author(s):  
R. C. Ploetz ◽  
F. M. Shokes
Keyword(s):  
Southeastern United States ◽  
Stem Canker ◽  
Relative Importance ◽  
Symptom Development ◽  
Canker Disease ◽  
Soybean Seedlings ◽  
Plant Parts ◽  
Diaporthe Phaseolorum ◽  
Leaf Infection ◽  
Positive Correlations

Leaves, petioles, petiole bases, and stems of 'Hutton' soybean seedlings (V5-V6) were inoculated with ascospores and α-conidia of southern Diaporthe phaseolorum to determine the relative importance of these plant parts as infection sites. This objective was accomplished in two experiments either by removing certain plant parts after inoculation and incubation for infection (48 h) or by protecting plant parts from infection during inoculation and incubation of plants. In both cases, plant parts were assayed for infection 48 h after inoculation and after plants had reached the R3 growth stage (66 and 56 days after inoculation for experiments 1 and 2, respectively); symptom development was rated at the end of each experiment. Significant, positive correlations were detected between the incidence and severity of symptoms and the infection of either stems 48 h after inoculation (P < 0.01 and 0.05, respectively) or petiole bases at the end of the experiments (P < 0.001 and 0.01, respectively). Development of symptoms was not significantly correlated (P ≥ 0.05) with infection of petioles, petiole bases, or leaves 48 h after inoculation. These results suggest an important and causal role for infection of petiole bases and stems in the development of the symptoms of this disease. Leaf infection appears to be unimportant in the stem canker disease cycle in the southeastern United States.

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