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柑桔无性系的衰败可能是由于植株天然生理老化,其次是突变,以及不表现明显症状的病毒感染等等因素综合作用的结果。病毒病所导致的柑桔无性系在活力和产量方面的下降,其确切程度尚不清楚。然而,现在生产上大多采用从老的无性系植株选择珠心芽品系的繁殖方法。这些珠心芽品系在生理上得到复壮,即使非全部,也是大多数都避免了病毒病。由此所产生的植株,都比其亲本生长更茁壮,树龄更长,产量更高。珠心芽也可能创出合乎理想的砧穗新组合。但若用已感染的老无性系接穗,则不能获得这种组合。迄今至少已知有15种柑桔属病毒,可能还存在更多种的病毒,但不表现明显的症状。
The decay of citrus clones may be due to the natural physiological aging of plants, followed by the combination of mutations and viral infections without obvious symptoms. The exact extent of the decline in viability and yield of citrus clones caused by viral diseases is not yet known. However, the breeding method of selecting beads and bud buds from old clonal plants is now mostly used in production. These beads of bud and flower buds are physiologically rejuvenated, and most, if not all, are virus-free. The resulting plants grow more robustly, grow longer and have higher yields than their parents. Pearl heart bud may also create a desirable new combination of scion. However, this combination can not be obtained with infected clones of old clones. So far, at least 15 types of citrus viruses have been known, and many more viruses may exist, but no obvious symptoms are present.