不同肉色甘薯交互嫁接后块根干物质积累研究

Accumulation of Dry Matter in Sweetpotato Storage Roots after Reciprocal Grafts among 5 Varieties with Different Flesh Color

本文通过对"徐薯18","渝苏162","渝薯99","渝紫263"、"渝苏紫43"等3种不同肉色类型的5个不同品种的交互嫁接,设置25个嫁接组合和双重对照,分析嫁接后不同肉色甘薯在生长过程中的块根干物率和产量的变化情况。结果表明,①嫁接后,块根干物率和产量的变化受到砧木、接穗、生长期及其交互作用的共同影响;光合产物在地上部和地下部的分配与块根干物质产量的积累成极显著相关;②与未嫁接的植株比较,嫁接对大多数嫁接组合的光合产物向下运输有阻碍作用,对少数特定组合在特定的生长时期有显著促进作用;③与相同品种嫁接的植株比较,同一肉色类型的甘薯砧木对其它2种肉色类型接穗对响应能力不一致,同一肉色类型甘薯接穗对其它2种肉色类型砧木对影响能力也是不一致的。

25 combinations were conducted through being reciprocal grafted among five sweetpotato varieties with different root flesh color. Five varieties were ＇ Yusu 162＇ with light orange root flesh, ＇ 2-19-99＇ with dark orange root flesh, ＇ Yuzi 263＇ with light purple root flesh, ＇ 2-I19-43＇ with dark purple root flesh and ＇ Xushu 18＇ with white root flesh, respectively. Dry matter accumulation in 25 reciprocal grafting combinations during the developing stages after being grafted were analyzed. Results shows： （i）Aeeumunations of dry matter after being reciprocal grafted were effeeted by stocks, scions, developing stages of combination and theirs interactions together. The photosynthate distributed to the tops and tuber roots had significant correlations （P〈0.01） with the dry matter accumulation in storage roots. （ii）For the most of combinations after grafted, there were negative influences on the transportation of the photosynthate allocating to storage roots, compared with the non-grafted plant（ CK1 ）. But the dry matter accumulation had significant （ P〈0.05 ） increase for few grafting combination in specifically developing stage. （iii） The variations of dry matter accumulation of the same flesh color type of stock in response to the other 2 type of flesh color scions were different, and the variations of dry matter accumulation of the same fleshcolor type of scion in response to the other 2 type of fleshcolor stocks were also different, compared with CK2 （the stock and scion were the same genotype）.