gi 148 / 8 as used as a rootstock for sweet cherry trees induces dwarfing to a significant degree . in comparison with rootstock f12 / 1 , gi 148 / 8 produces 30 percent of growth , as measured as the fresh weight of the upper tree parts of cv . &# 34 ; hedelfinger &# 34 ; after 12 years in orchards near giessen , germany . precosity , high production of fruit and yield efficiency , good 100 - fruit weight and no or very few suckers were induced . gi 148 / 8 as a rootstock confers earlier and heavier bearing to the scion as compared to f12 / 1 clonal cherry rootstock . in one trial , it induced a yield in the variety &# 34 ; hedelfinger &# 34 ; in the 5th leaf of 4 . 9 kg / tree ( cf . f12 / 1 : 0 . 2 kg / tree ) and in the 7th leaf of 18 . 8 kg / tree ( cf . f12 / 1 : 5 . 7 kg / tree ). as a mean of seven years , 100 - fruit - weight of &# 34 ; hedelfinger &# 34 ; grafted on 148 / 8 was 754 grams , while 100 - fruit - weight of &# 34 ; hedelfinger &# 34 ; grafted on f12 / 1 was 735 grams . gi 148 / 8 itself is semi - drooping . after eight growing seasons near giessen , germany , gi 148 / 8 demonstrated a height of 1 . 30 meters and a width of 2 . 20 meters . gi 148 / 8 is sensitive to the virus pnrv , tolerant to the virus pdv , and medium sensitive to &# 34 ; pfeffinger disease .&# 34 ; it has a sufficient tolerance to water - logging . the following varieties of sweet and sour cherries have been successfully grafted onto gi 148 / 8 : hedelfinger riesenkirsche , buttners rote knorpel , grosse schwarze knorpel , van , gold , ulster , bing , early burlat , emperor francis , querfurter konigskirsche , napoleon , rainier , sam , schmidt , schneiders spate knorpel , stella , vega , vic , viva , windsor , hudson , lambert ; montmorency , meteor , rubinweichsel , morellenfeuer , north star , schattenmorelle , rheinische schattenmorelle , ludwigs fruhe , leitzkauer , nabella , successa , schwabische weinweichsel . no graft incompatibility is presently known . ploidy of 148 / 8 is probably triploid ( 2n = 3 ×). the ploidy status of the parents has been investigated by isoemzyme analysis and is tetraploid ( 2n = 4 ×) for the mother plant = prunus cerasus , &# 34 ; schattenmorelle &# 34 ;, and diploid ( 2n = 2 ×) for the father plant , prunus canescens . overall .-- 1 - year old branches are sparsely pubescent , lenticels on 1 - year old branches are light cream colored , 0 . 5 mm diameter , buds alternate , with 2 - 5 buds at base of 1st years growth , 19 nodes on 1 - year old branches . branch and lenticel color are not considered to be distinguishing characteristics . branch dimensions : ( for a single gi 148 / 8 plant in the ungrafted condition after the 5th leaf ; in brackets , comparable data for f12 / 1 ). buds : conical , acute , adpressed , 2 - 3 mm long , overlapping bud scales , with prominent leaf scars . no ornamental value . 1984 and 1985 .-- at the 2nd of may not yet popcorn stage . root system : exceptional total length of roots and a high percentage of very thin roots ; 93 - 94 percent of the roots are thinner than 5 mm diameter . survey of growth data : growth of clones , not grafted , 60 kilometers south of giessen , germany . measurements .-- after 8 years ( fresh weight ): height 1 . 3 meters , width 2 . 2 meters , depth 2 . 7 meters , fresh weight 3 . 0 kg . general .-- very weak growing , broad . growth of clones grafted with &# 34 ; hedelfinger riesenkirsche &# 34 ; 60 kilometers south of giessen , germany . rooted out .-- apr . 1988 ( after 12 years in orchard ) mean values of three trees with f12 / 1 standard ( also mean value of three trees ). ______________________________________ gi 148 / 8 f12 / 1______________________________________height of crown 2 . 9 m 5 . 2 m ( winter 87 / 88 ) width of crown 4 . 1 m 6 . 2 m ( winter 87 / 88 ) stem cross sectional 259 cm . sup . 2 503 cm . sup . 2area of variety ( winter 87 / 88 ) stem cross sectional 117 cm . sup . 2 486 cm . sup . 2area of rootstock ( winter 87 / 88 ) fresh weight of plant 53 . 5 kg 176 kgparts above ground ( april 88 ) weight in percent 30 . 4 % 100 % ______________________________________ ______________________________________ 148 / 8 f12 / 1______________________________________at the end of 1979 = 6 . 6 7 . 7after 4 years in orchard : at the end of 1980 = 8 . 2 11 . 5after 5 years in orchard : at the end of 1981 = 10 . 1 14 . 3after 6 years in orchard : ______________________________________ enzyme polymorphism : ( studied by horizontal starch gel electrophoresis of leaf tissue of 8 loci .). the results for 148 / 8 and 148 / 1 are : ______________________________________ 148 / 1 148 / 8______________________________________aconitase - 2 24 2alkoholdehydrogenase - 1 112 1isocitratdehydrogenase - 2 112 112leucinaminopeptisase - 1 34 345 - phosphogluconat - dehydrogenase - 1 112 1126 - phosphogluconat - dehydrogenase - 2 122 122phophoglucose - isomerase - 2 224 224phosphoglucomutase - 2 25 25______________________________________ general comparative data : in order to further distinguish 148 / 8 from its siblings , 148 / 1 and 148 / 9 , the following comparative data are set forth for the latter two varieties : 148 / 1 .-- provides 67 percent of growth , and measures at the height of the upper parts of &# 34 ; hedelfinger &# 34 ; as compared to rootstock f12 / 1 after 12 years in orchards near giessen , germany . gi 148 / 1 is generally erect and medium strong in growth . ungrafted , 148 / 1 exhibits medium strong vigor . 148 / 9 .-- is sensitive to pnrv . does require support and has few suckers ; yield of &# 34 ; hedelfinger &# 34 ; on 148 / 1 typically much greater than on 148 / 9 and vigor of &# 34 ; hedelfinger &# 34 ; less on 148 / 9 than 148 / 1 .
the new and distinct cultivar of cherry rootstock , which has been given the designation gi 148 / 8 produces a tree which is generally spreading and which upon grafting produces a dwarf tree .