Abstract:
Bud grafting is a common asexual propagation method in rubber trees.Budding stick is the main component of budding seedlings, but the quality of bud patches and effect of bud grafting are still not clear.In this experiment, we used the bud sticks from the five leaf-umbrellas with stable phenology as budding materials, and analyzed the effects of bud patches from different leaf-umbrellas on the bud grafting survival rate and growth potential of green buddings in rubber trees.The results showed that among the bud sticks from the five leaf-umbrellas, the second leaf-umbrella had the highest bud eyes, available bud patches, effective bud patches utilization rate and the budding survival rate, and was the best choice for the green buddings.The budding survival rates in the first, the third and the fourth leaf-umbrellas bud patches were more than 95% and could be an alternative selection.The fifth leaf-umbrellas demonstrated a better sprouting rate of up to 97% and scion growth potential, and was also an option to be used.The performance of budding technician was the key factor affecting the survival rate of rubber green buddings, but had no effect on the growth potential of the scion.The bud patches located at different positions for bud grafting of rubber green buddings had different survival rate of buds, the sprouting rate of scion, the seedlings out of the nursery rate, and the growth potential of buddings.With the leaf-umbrellas sprouting from green buddings, the grafting bud patches of the top leaf-umbrellas exhibited advantageous growth potentials in plant height, stem diameter, and the distance between two leaf-umbrellas.Therefore, significant differences exist for the bud patches quality and bud grafting efficacy in rubber green budding from different leaf-umbrellas positions.