摘要： 本研究分1975—1979年、1987—1988年两个阶段进行,共295个材料,试验7年.其结果:无性一代与无性二代最长蔓长、茎叶重、茎粗、单株薯数、基部分枝数呈极显著正相关,变异系数较小,性状稳定;一代单株薯重与无性二代产量相关不显著,且变异系数大,为50.69%.但进一步发现,无性一代单株薯重高或居中的品系到无性二代出现超标品系的百分率高,而薯重低或居中的品系到无性二代没有或极少出现超标的品系,据此认为,无性一代产量应为选择性状.这与前人看法不同.无性一代最长蔓长100—200cm、分枝数11—13个、单株薯数5—6块的品系,其无性一代薯重与无性二代产量呈显著正相关,该结果将为提高甘薯无性一代选择的准确性提供依据.

关键词: 甘薯, 无性一代, 选拔性状, 选择类型

Abstract: This study was performed in two stages in 1975-1979 and 1987-1988. There were 295 materials for test during 7 years. The results were as follows: The first and second vegetative generations were positively and significantly correlated with each other in length of longest viticula, weight of viticula and leaf, viticula diameter, tuber number per plant and number of proximal branches. The variation coefficient was lower and the characters were stable. The tuber weight per plant in the first generation was unsignificantly correlated with the yield in the second generation, and the variation coefficient was great (50.69). But the lines with higher and middle tuber weight per plant in the first generation appeared high percentage of supercontrol line in the seoond generation, and the lines with low tuber weight appeared few or no supercontrol line in the second generation. Therefore the authors held that the yield in first vegetative generation should be as a selective character. This position differs from that of others. When the lines have the longest viticula (100-300cm), 11-13 branches, 5-6 tubers per plant in the first vegetative generation, the tuber weight in the first generation is positively and significantly correlated with the yield in the second vegetative generation. This conclusion has provided a basis for improvement of selective accuracy lor the first vegetative generation of sweet potato.

Key words: Sweet potato, First vegetative generation, Selective character, Selective type