However, the watermelon is very narrow genetic resources in the breeding of new varieties are largely limited.
由于西瓜遗传资源非常狭窄，在培育新品种方面受到很大限制。
The breeding practices indicate that it is feasible to guide the breeding of new varieties through use of this theory and method.
育种实践证明，这种理论与方法用于指导新品种选育是切实可行的。
Improvement of crops and breeding of new varieties to increase their drought and salinity tolerance is the most economic and effective ways for using arid and salty soils.
培育抗旱耐盐农作物新品种是利用干旱盐碱地最为经济、有效的措施。
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