Selection for individual traits in the early generations of a potato breeding program dedicated to producing cultivars with tubers having long shape and russet skin
Selection for individual traits in the early generations of a potato breeding program dedicated to producing cultivars with tubers having long shape and russet skin
复制标题
DOI：
10.1007/bf02851598
复制
发表时间：
1997-05-01
期刊：
影响因子：
--
通讯作者：
Pavek, JJ
中科院分区：
文献类型：
--
作者：
Love, SL;Werner, BK;Pavek, JJ
在马铃薯育种项目中，早期世代选择涉及到基于外观的经济价值的目测评估。通过使用具有定义的选择行为的个体特征，可以提高效率。本研究旨在明确可视性状在马铃薯育种中用于选择的可选性。通过三个无性系世代对27个性状进行了评估，使用了200个无性系，每个无性系来自10个杂交组合，这些无性系来自一个创造出长块茎形状和黄褐色皮肤的品种的群体。用基因×环境互作、遗传力、世代间相关系数、地点间相关系数和排斥模式分析来量化每个品系的表达一致性，所选性状表现出广泛的遗传力和表达一致性。将性状分为三类：适合正向选择的性状、适合负选择的性状和不应被忽视的性状。研究表明，对皮肤锈化程度、皮肤缺陷的发生率和严重程度进行正向选择是可能的。负选择对二次生长、生长裂缝、块茎畸形、块茎弯曲、尖端、黄褐斑的发生率和严重程度、眼深、块茎形状、产量、块茎数、平均块茎重和扁平度是适宜的。在较小程度上，负选择可以用来降低眉毛突出度、眼睛遮盖度和节间突出度。在早期世代选择中不一致的性状包括：块茎外观一致、块茎形状一致、块茎大小一致。二次生长、生长裂缝、块茎畸形、块茎弯曲和尖端的严重程度评分不一致，不应用来代替相同性状的发病率评分。
Early generation selection in a potato breeding program involves visual assessment of economic worth based on appearance. Efficiency could be improved by using individual characteristics with defined selection behavior. This study was done to define the selectability of visible traits used for selection in the early generations of potato breeding. Twenty-seven traits were evaluated through three clonal generations using two hundred clones, twenty from each of ten crosses, taken from a population created to produce cultivars with long tuber shape and russet skin. Genotype x environment interactions, heritabilities, correlation coefficients among generations and locations, and rejection pattern analysis were used to quantify the consistency of expression for each trait.The chosen traits showed a wide range of heritabilities and consistency of expression. Traits were divided into three categories: those amenable to positive selection, those appropriate for negative selection, and those which should be ignored. The study showed positive selection to be possible for degree of skin russetting, and the incidence and severity of skin defects. It showed negative selection to be appropriate for incidence of second growth, growth cracks, tuber malformations, tuber curvature, pointed ends, the incidence and severity of russet patchiness, eye depth, tuber shape, yield, tuber number, average tuber weight, and flatness. To a lesser extent, negative selection could be used to reduce eyebrow prominence, degree of eye covering, and prominence of internodes. Traits too inconsistent for use in selection in early generations included uniformity of skin russetting, uniformity of tuber shape, and uniformity of tuber size. Severity ratings for second growth, growth cracks, tuber malformations, tuber curvature, and pointed ends were inconsistent and should not be used in lieu of incidence scores for the same traits.