Scientific Papers Series B Horticulture

Table 3 defines LSD test for genotypes effecton tuber dry matter and tuber starch content.EC 550 x AC 208-72h had the highest value ondry matter content. Otherwise, on tuber starchcontent character the best result was showed byAC 216-139 d, then followed by EC 550 x AC208-72h. The average tuber starch content ofyam bean produced in Indonesia is about 1%,therefore the new genotype resulted frominterspesific crossing between P. erosus and P.ahipa (EC 550 x AC 208-72h) could beconsidered for further development forcosmetics raw material.Table 3. Effect of genotypes on yam bean tuber drymatter and total starch contentGenotypesB-10 / EC 550B-1 / EC 033B-56 / CJAC 216-139 dB-10 / EC 550 x AC216-139 dB-1 / EC 033 x B-56 /CJAC 216-139 d x B-56 /CJB-10 / EC 550 x B-56 /CJB-10 / EC 550 x AC208-72hTuber Dry Tuber StarchMatter Content% %6,11 de5,36 e7,33 bcde9,39 abcd7,50 abcde8,82 ab6,60 cde8,35 abc10,27 a1,07 c1,20 c1,63 c6,71 a1,34 c1,68 bc1,45 c1,76 bc2,66 bNumbers followed by the same letters are notsignificantly different on alpha 0.05 LSD testThere was interaction between genotypes xsink-reproductive pruning on tuber dry mattercontent, it is shown on Table 4. On nonpruningtreatment, only P. ahipa AC 216-139 dgave smallest mean value for tuber dry mattercharacter. While, contrast result was shown onsink-reproductive pruning, AC 216-139 dgenotype had the highest value than othergenotypes, then followed by interspesifichybrid genotype EC 550 x AC 208-72h.In this study, pruning did not affectthequalitative traits such dry matter and starchcontent of tuber. Yam bean productionincreased as the result of pruning, but thispractice did not affect the percentage of solublesugar content and dry matter percentage.However, there are variations of these traits ongenotypes were evaluated caused by geneticfactors (Zanklan, 2003). This variation can be447seen in the character of dry matter and starch.Tuber dry matter content is a parameter thatreflected the extent of how far photosynthesisproduct is distributed to the tuber. Efficiency ofthe photosynthetic process is shown in the rateof accumulation of dry matter content (Gardneret al., 2008).Table 4. Interaction between Genotypes x Sink-Reproductive Pruning on Tuber Dry MatterTuber Dry MatterGenotypesWithout WithB-10 / EC 550B-1 / EC 033B-56 / CJAC 216-139 dB-10 / EC 550 x AC 216-139 dB-1 / EC 033 x B-56 / CJAC 216-139 d x B-56 / CJB-10 / EC 550 x B-56 / CJB-10 / EC 550 x AC 208-72hPruning8,51 abcA6,04 bcdA7,65 abcdA1,38 dB8,78 abcA10,42 abA9,70 abcA8,34 abcA11,71 aAPruning3,71 BB4,68 BA7,01 BA16,34 AA6,22 BA7,23 BA3,50 BB8,37 AbA8,84 AbANumbers followed by the same letters are notsignificantly different on alpha 0.05 LSD test Smallletter read vertically; Capital letter read horizontallyP. erosus is the most stable species in production,also it produces the prime number foryield (Kale, 2006). P. ahipa is known as specieswith smaller tuber, but higher in dry matterand starch content. Therefore, hybridizationusing those species is expected to gain the newgenotype in high production amount with betterquality especially starch content. This studynoted that intraspesific and interpesific crossesproduced a new genotype with higher productionyield with better quality character fordry matter and starch than the elders.CONCLUSIONSPruning and genotype independently affectedtuber fresh weight. The heaviest tuber producedby P. erosus B-1 / EC 033.Genotypes affected in tuber dry matter andtuber starch content. The highest dry matterwas contained in interspesific crossing between