病毒通常是严重阻碍作物生长的。但印度中央研究所的高希(S·K·Goh) 发现了一种能刺激作物生长的病毒,并可用来使某些作物增产。这种病毒叫“水稻花叶坏死病毒”(R N M V) 能阻碍水稻生长并引起坏死(局部细胞死亡),形成病叶叶片褪色斑纹。高希发现R N M V不仅侵犯水稻,也能感染Ludwigia perennis。其症状为:叶基部出现黄白色斑点,继之整个叶片呈黄绿色花叶。但高希发现,Ludwigia病株和水稻不同,反而此 Viruses are usually a serious hindrance to crop growth. However, SC Goh found a virus that stimulates crop growth and can be used to increase production of some crops. This virus, R N M V, can hinder rice growth and cause necrosis (local cell death), forming faded stripes on sick leaves. Ghosh found that R N M V infects not only rice but also Ludwigia perennis. The symptoms are: yellowish white spots on the base of the leaves, followed by yellowish green leaves throughout the leaves. However, Gosh found that the Ludwigia strain differs from rice in that way