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叶子花褪绿脉斑病毒 (BsCVBV): 2001 年巴西首次报道 ,随后在台湾和印度 [106,107,108]发现。患病的叶子花植物表现褐斑、 萎黄、 脉斑、 叶扭曲和发育不全等症状。该病毒通过芽嫁接传播。
7.2. Bougainvillea spectabilis chlorotic vein-banding virus (BsCVBV)Bougainvillea chlorotic vein-banding disease caused by Bougainvillea spectabilis chlorotic vein-banding virus (BsCVBV) was first reported in Brazil in 2001 and subsequently from Taiwan and India [ 106, 107, 108]. The diseased bougainvillea plants developed symptoms such as mottling, chlorosis, vein-banding, leaf distortion, and stunting. Symptom variability of different cultivars in Taiwan was reported [ 109]. The virus is transmitted through bud grafting. It was characterized by electron microscopy, which showed typical bacilliform particles, and by sequencing of a portion of ORF 3 revealing similarities with known badnaviruses. The complete genome contains 8759 bp with four ORFs [ 34] ( Figure 5). Two distinct badnaviruses infecting B. spectabilis in two different locations of India and with distinct symptoms (severe yellow mosaic and chlorotic vein banding, rsp.) could be distinguished by sequencing of the RT/RNaseH region [ 108]. |