The current study was undertaken to identify the sources of tolerance to bruchid in cowpea, by screening a set of germplasm accessions as a source for natural resistance. A total of 103 diverse accessions of cowpea were evaluated for resistance to Callosobruchus maculatus Fab. under no-choice artificial infestation conditions. Significant differences among the cowpea accessions were observed for oviposition, adult emergence, exit holes and per cent seed weight loss (PSWL) caused by the bruchid infestation. The accessions showed variation in physical seed parameters viz., colour, shape, testa texture, length, width and seed hardness. Among the seed biochemical parameters studied, per cent sugar content ranged from 0.322 (IC330950) to 1.493 (IC249137), and per cent phenol content ranged from 0.0326 (EC390261) to 1.081 (EC528423). Correlation studies indicated that PSWL had significant positive correlation (r = 0.335) with exit holes, oviposition (r = 0.219), adult emergence (r = 0.534) and seed roundness (r = 0.219). Adult emergence had a significant negative correlation with seed hardness (r = −0.332). Correlation with biochemical parameters indicated that PSWL had a significant positive correlation (r = 0.231) with sugar content and a significant negative correlation with phenol content (r = −0.219). None of the accessions were found to be immune to bruchid infestation. However, out of studied accessions, EC528425 and EC528387 were identified as resistant based on PSWL and moderately resistant based on adult emergence. These resistance sources of cowpea germplasm can be used as potential donors for development of bruchid tolerant/resistant cultivars.

中文翻译：

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豇豆 [Vigna unguiculata (L.) Walp.] 对 bruchid [Callosobruchus maculatus (Fab.)] 不同种质的评价及其与种子理化参数的相关性

目前的研究是通过筛选一组种质材料作为天然抗性来源来确定豇豆对 bruchid 耐受性的来源。共评估了 103 个不同的豇豆种质的抗性斑蝾螈晶圆厂。在无选择的人工侵染条件下。观察到豇豆种质在产卵、成虫出苗、出口孔和由 bruchid 侵染引起的种子重量损失百分比 (PSWL) 方面存在显着差异。种质显示出物理种子参数的变化，即颜色、形状、种皮质地、长度、宽度和种子硬度。在所研究的种子生化参数中，糖含量百分比范围为 0.322 (IC330950) 至 1.493 (IC249137)，苯酚含量百分比范围为 0.0326 (EC390261) 至 1.081 (EC528423)。相关性研究表明，PSWL 呈显着正相关（r= 0.335) 带出口孔，产卵 (r= 0.219)，成虫出现 (r= 0.534) 和种子圆度 (r= 0.219）。成虫出苗与种子硬度呈显着负相关（r= -0.332)。与生化参数的相关性表明PSWL呈显着正相关（r= 0.231) 与糖含量和苯酚含量呈显着负相关 (r= -0.219)。没有发现任何种质对 bruchid 侵染免疫。然而，在研究的种质中，EC528425 和 EC528387 根据 PSWL 被鉴定为抗性，根据成虫出现被鉴定为中等抗性。豇豆种质的这些抗性来源可作为潜在的供体，用于培育耐/抗性品种。