例1: 有两个不同的番茄品种,一个是抗病、黄果肉的品种(ssrr)另一个是易感病、红果肉的品种(SSRR),目标是培育出一个既抗病又是红果肉的新品种(ssRR),并且新品种的性状能稳定遗传。
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秧苗尤以3~5叶龄期最易感病,6叶龄后抗耐病性逐渐增强,在分蘖盛期后病株基本死亡。
Seedlings at 3 - 5-leaf stage were the most susceptible. The tolerance to the disease increased after 6-leaf stage. Diseased plants died after the peak time of tillering stage.
一定数量的病原生物、易感病的寄主以及有利的发病条件是任何病原生物引起的植物病害发生的必要条件。
Sufficient pathogen, susceptible host and favourable environmental conditions, which are necessary to the outbreaking of the plant disease.
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