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首页> 外文期刊>South African Journal of Plant and Soil >Field evaluation of Ugandan sweetpotato germplasm for yield, dry matter and disease resistance.
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Field evaluation of Ugandan sweetpotato germplasm for yield, dry matter and disease resistance.

机译：乌干达甘薯种质的田间评价，包括产量，干物质和抗病性。

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摘要

A total of 946 morphologically distinct accessions of sweet-potato (Ipomoea batatas [L.] Lam) germplasm collected from Uganda were evaluated along with four released cultivars for root yield, dry matter, sweetpotato virus disease (SPVD) and Alternaria bataticola blight disease resistance for two seasons; 2005B (September 2005 to January 2006) and 2006A (April to August 2006) at three sites for selection of superior genotypes. The genotypes differed significantly in yield, dry matter content, SPVD and Alternaria blight resistance (p=0.05). Genotype SPVD severity ranged from 1.0 to 5.0 with an overall mean of 2.6. Alternaria severity scores ranged from 1.0 to 5.0 with an overall mean of 2.2. Total root yields ranged from 0.0 to 52.5 t ha-1 with an overall average of 20.3 t ha-1. Most genotypes had mean total root yields of less than 15.0 t ha-1, low specific gravity values of less than 2.0, and low disease resistance. A positive correlation was observed between SPVD and Alternaria blight (r=0.33), while both diseases were negatively correlated with yield traits. A total of 192 superior genotypes were selected for further evaluation and use for variety development in hybridization schemes.
机译：评估了从乌干达收集的总共946种形态上不同的甜马铃薯（Ipomoea batatas [L.] Lam）种质以及四个释放品种的根产量，干物质，甘薯病毒病（SPVD） ）和 batternola 抗病两个季节; 2005B（2005年9月至2006年1月）和2006A（4月至2006年8月）在三个用于选择优良基因型的位点。基因型在产量，干物质含量，SPVD和抗白纹病的抗性上有显着差异（p = 0.05）。基因型SPVD的严重性介于1.0到5.0之间，总体平均值为2.6。 Alternaria 的严重程度评分在1.0到5.0之间，总体平均分为2.2。根的总产量为0.0到52.5 t ha -1 ，总平均产量为20.3 t ha -1 。大多数基因型的平均根总产量小于15.0 t ha -1 ，比重值小于2.0，抗病性低。 SPVD与枯萎病之间存在正相关（r = 0.33），而两种疾病均与产量性状呈负相关。总共选择了192个优良基因型进行进一步评估，并用于杂交方案的品种开发。

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