Effects of genotype and environment on vitamin C content and its heterosis in towel gourd fruits
2008
Xu, Shengchun | Hu, Jin | Tan, Hong | Zhang, Sheng
BACKGROUND: Vitamin C is an indispensable component in the diet of humans, who lack the ability to synthesise it. Towel gourd (Luffa cylindrica L.) is a vegetable that is widely consumed in Asia, but little is known about the vitamin C content in its fresh fruits. In this study the effects of genotype and environment on the vitamin C content and its heterosis in towel gourd fruits were investigated using eight inbred lines and nine F₁ hybrids planted in two different seasons (spring and summer).RESULTS: Among the 17 cultivars studied, vitamin C content ranged from 5.94 to 12.89 mg per 100 g, suggesting the possibility of selecting new towel gourd varieties with high vitamin C content. The effects of genotype, environment (planting season) and their interaction on vitamin C content were all significant (P<=0.01), with genotype having the largest effect. Five out of six hybrids showed positive heterosis over the mean values of their parents. However, it was difficult to predict the vitamin C content in F₁ fruits from that in their parents.CONCLUSION: The results of this study suggest that the vitamin C content in towel gourd fruits can be affected by genotype and environment and might be increased by crossing. This could provide a theoretical basis for selecting varieties with high vitamin C content.
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