| 作成者 |
|
|
|
|
|
|
|
| 本文言語 |
|
| 出版者 |
|
|
|
| 発行日 |
|
| 収録物名 |
|
| 巻 |
|
| 開始ページ |
|
| 終了ページ |
|
| 出版タイプ |
|
| アクセス権 |
|
| JaLC DOI |
|
| 概要 |
マツ材線虫病がマツの根に及ぼす影響を地上部の病徴の進行との関連で明確にするために，マツノザイセンチュウを接種したクロマツ笛の根の成長の実態を根箱を使用して観察した．マツノザイセンチュウを接種したタロマツ苗の根は接種3日目で伸伸長を停止した．この時点での笛木の水分状態を示す明け方の針葉の水ポテンシャル（BP〉 および樹脂滲出には異常は見られなかった．しかし伸長停止と同時に根端部の白色根長が褐色化によ...って減少した．白色根が褐色化によってほとんど消失した接種12日目には樹脂滲出が停止し，BPの低下が始まった．さらに，この時期に根の含水率が異常に増大した．その後，BPの低下と針葉の変色が急激に進行し，クロマツ苗は枯死した．このようにマツノザイセンチュウを接種したタロマツ笛の根は接種後ただちに成長を停止し，白色根が褐色化によって消失し，引き続いて本病の特徴である萎凋症状が発現し，クロマツ苗は枯死した．
Root growth of Pinus thunbergii PARL. seedlings inoculated with Bursaphelenchus xylophilus (WEINER et BURER) NICKLE were investigated using root system observing boxes, The roots of seedlings inoculated with Bursaphelenchus xylophylus stopped growing on the 3rd day after inoculation. At this point, abnormalities in oleoresin flow and base xylem pressure potential (BP) which indicates the water status of seedlings, were not observed. However, decreasing the length of white colored roots at the extremity of the roots coincided with the cessation of root growth. On the 12th day after inoculation, white colored roots disappeared, oleoresin flow ceased and the decline of BP began. Moreover, abnormal increment of water content in the roots observed. Subsequently, decline in BP and discoloration of needles advanced dramatically, and seedlings inoculated with Bursaphelenchus xylophilus died. Pinus thunbergii seedlings inoculated with Bursaphelenchus xylophilus, wilting symptoms which constitute a characteristic feature of the disease appeared after cessation of roots growth. It was therefore we concluded that the wilting symptoms of Pinus thunbergii seedlings inoculated with Bursaphelenchus xylophilus have greatly been under the influence of physiological damage to the roots.続きを見る
|
Mendeley出力
