|Title:||柑桔砧穗之親和性與癒合組織形成能力之研究||Other Titles:||Studies on the Congeniality and Callus Formation of the Grafted Citrus Fruit Trees||Authors:||翁仁祿
J. L. Weng
|Keywords:||砧木;接穗;維管束系連絡;rootstock;scion;vascular connection||Issue Date:||Apr-1968||Publisher:||臺灣園藝學會||Journal Volume:||14||Journal Issue:||1-2||Start page/Pages:||71-100||Source:||中國園藝||Abstract:||
The most important commercial varieties of citrus fruit grown in
Taiwan, namely: Ponkan, Tankan, Golden Seal orange, Valencia orange, Wase Satsuma mandarin and Kumquat were grafted on Rangpur lime, Trifoliate orange, Sunki and pummelo rootstocks with a total of twenty-four combinations. Using the grafted nursery trees of those combinations, their congeniality growth rate, morphological features and characteristics of callus formation on the graft union were examined. Resuts are made as follows:
1. Rangpur lime rootstock: Nursery trees which grafted on this rootstock showed great vigor, rapid growth rate and speedy increase in the plant height, shoot and root weight as well as in the total leaf area of each tree. However, owing to its highly ability oi tissue regeneration and the rapid division of cells on the wound areas, callus was quickly formed by the rootstock's tissue itself on the graft union and, therefore, the plant has poor vascular connection between rootstock and the scion. It was found that the rootstock is only fairly
congenial to kumquat and less congenial to other citrus varieties tested.
2. Trifoliate orange rootstock: Trifoliate orange was considered not highly adaptable to the sub-tropical climate of Taiwan where the winter temperature remains high. Citrus nursery trees grafted on this kind of rootstock grew very slowly and had poor callus formation on the graft union. What is worse, the tissues of rootstock easily die back downward from the cut surface made in grafting, and hence causing very loose connection between the scion and the rootstock on the graft union. No wonder that breakage occurs easily on the union when tension forms by typhoon or other mechanical pressure. It is found that trifoliate orange can only be used as a rootstock
for Wase satsuma mandarin in the absence of a more desirable rootstock.
3. Sunki rootstock: Sunki has been extensively used as a rootstock for many citrus varieties for decades in Taiwan. It is found highly congenial to almost all scion varieties tested. There is a well formed graft union on the grafted tree. The growth rates of both scion and rootstock seem identical, and the vascular connection between them is also good. The only exception is that when it is grafted to the Wase Satsuma mandarin, the central part of the graft union has a loose connection and a gap, and hence they are considered less congenial.
4. Pummelo rootstock: Pummelo seedlings grow vigorously in the field. But when they are grafted to the above-listed scion varieties, the trees do not grow normally owing to the difference between each other's tissue. Therefore, it is considered that pummelo is not congenial to these scion varieties and cannot be used as a rootstock.
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