甘薯主要数量性状对单株产量的通径分析

用秦薯1号自交后代实生苗为试验材料，试验对甘薯的分枝数(x1)、最长蔓长(x2)、分枝总长(x3)、节间长(x4)、蔓粗(x5) 、叶面积(x6)、单株绿叶重(x7)、藤叶重(x8)、单株薯数(x9)、单薯重(x10)、根冠比(x11)和单株产量(y)12个数量性状进行了测定。通过相关分析、逐步回归和通径分析表明单株绿叶重对单株产量的影响最大；单株薯数和单薯重对单株产量的直接作用较大。高产育种以单株产量为选择目标时，应以单株绿叶重、单株薯数和单薯重的选择为主，结合根冠比、分枝数、叶面积和蔓粗，对这7个性状进行综合考虑和选择。

Path Analysis on Main Quantitative Traits to Root Tuber Weight per Plant in Sweet Potato

The experiments were carried out with the self-mating progenies derived from 'Qinshu No.1' sweet potato and twelve quantitative characters were determined i.e. the number of vine branches (x1), the longest length of branch (x2), the length of all branches (x3), the internode length (x4), the thickness of branch (x5), the area of leaf (x6), the weight of green leaves of single plant (x7), the weight of branches leaves (x8), the root tuber number of single plant (x9), the root tuber weight of single sweet potato (x10), T/R valve (x11) and root tuber weight of single plant (y). The results showed that the weight of green leaves of single plant greatly influenced root tuber weight of single plant, the root tuber number of single plant and root tuber weight of single sweet potato were secondly. So in high yield breeding, it should be considered all the seven traits, not only the weight of green leaves of single plant, the root tuber number of single plant, the root tuber weight of single sweet potato, but also T/R valve, the number of vine branches, the area of leaf, the thickness of branch.