“嫁接嵌木高壓法＂繁殖酪梨耐根腐病砧木之探討

Study on the Propagation of Avocado Resistant Stock by the Method of 'Franqueamiento'

為解決台灣酪梨根腐病危害問題，參考“嫁接嵌木高壓法”（ftanqueamiento）繁殖酪梨耐病砧木品系'Duke 7'。為比較採穗期、接穗儲藏期間及嫁接日對'Duke 7'之接穗嫁接於一般實生砧木之成活情形，於兩個日期切取'Duke 7'之接穗，將其儲藏於6±1°C下，1星期後第一次取出部分接穗嫁接於一般實生苗，而後每隔1星期取出部分接穗，再連續嫁接4次。結果顯示以1990年1月17日切取，儲藏14天後之接穗嫁接成活率最好，可達74.4%。又兩個切取日接穗，於儲藏後連續5次嫁接總成活率平均皆至少有43.53%以上，但平均間無顯著性 差異。為瞭解生長調節劑與'Duke 7'接穗萌發枝條生根促進之關係，於枝條長到30葉時，以浸過含IBA 0至10,000ppm或NAA 0至300ppm單獨或組合溶液之木片，插入枝條靠近接合部莖上之人為斜切口，並用介質高壓。9個月後調查生根情形，結果顯示除在IBA l,000ppm下，接穗萌發枝條無根發生外，其餘皆有10%生根，但處理間之差異不顯著。從接穗萌發枝條長根部位下方剪斷，即可繁殖得1新植株，將其盆栽於泥炭土對真珠石體積各半之介質後，可順利成活。

Because root rot (Phytophthora cinnommomi Rands)was a major threat to Taiwan avocado industry, root rot resistant stock propagation was very important. In this report propagation of 'Duke 7' by using 'Franqueamienton' method was tested. In order to study the effect of scion cut date, scion storage period and date of grafting on the percent of successful graft unions during two scion cut dates, 'Duke 7' scions every one week storage were grafted to common seedling stocks and that is continued the following four weeks. It was showed that the treatment, the 'Duke 7' scions which were cut on January 17 and grafted after storaged two weeks, had 74.4% percent of successful graft union, which was best of all the treatments. Both of the average of all the percent of successful graft unions of 'Duke 7' through the five weeks during two cut dates at least could attained 43.53%, but showed no statistically significant difference. To study the effect of regulators on the root inducing of shoots growed from scions, solutions which contained IBA 0 to 10,000 ppm or NAA 0 to 300 ppm, alone or in combination, were prepared and one thin piece of wood, which previously dipped and saturated with one of those solutions, was inserted into the lengthwise cut, made from bottom to top through the shoot. Then those treated shoots were air layered. All treatments had 10% rooting shoots except the treatment which was treated with IBA 1,000 ppm, but all treatments showed no statistically significant difference.