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首页> 外文期刊>Genetic Resources and Crop Evolution >Collection and evaluation of pearl millet (Pennisetum glaucum) germplasm from the arid regions of Tunisia
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Collection and evaluation of pearl millet (Pennisetum glaucum) germplasm from the arid regions of Tunisia

机译：突尼斯干旱地区珍珠粟（Pennisetum glaucum）种质的收集和评价

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Pearl millet (Pennisetum glaucum (L.) R. Br.) is the most important summer cereal crop in the arid regions of Tunisia. A total of 283 accessions from 18 landraces were collected during the growing season of 1997 and evaluated in vivo at IRA, Benguerdane (during growing season 1998). Landrace (populations) grown by the farmers were shown to be mixtures of several types. Considerable variation was observed for all characters studied according to the descriptors developed by IBPGR and ICRISAT (1993). Time to flower varied from 30 to 66 days after sowing. Plant height ranged from 59 to 314 cm with a mean of 197.86 ± 0.43. Number of tillers varied between 0 and 19 per plant. Considerable variation in spike shapes was observed. Frequency distribution analysis of different spike shapes shows predominance of lanceolate (23.7%) followed by oblanceolate (23.5%) over cylindrical (18.3%), conical (15.7%), candle (8.7%), spindle (6.6%), club (3.1%) and globose (0.3%) types. The landraces collected mostly produced large, grey-coloured, obovate seeds, with partly corneous endosperm. Analysis of variance (ANOVA) was performed to evaluate variation amongst the different landraces. The differences are highly significant at (α = 0.05) for all characters studied. Duncan analysis and hierarchical clustering were carried out to (1) estimate resemblance between provenances; and (2) group landraces into homogeneous classes (clusters). The resulting dendrogram shows three principal clusters regrouping landraces according to their geographical origins or farming conditions. Pearl millet germplasm from Tunisia’s arid region presents a wide range of genetic variability. It can be used as a starting basis for breeding programmes to select high yielding varieties tolerating adverse arid conditions.
机译：珍珠小米（Pennisetum glaucum（L.）R. Br。）是突尼斯干旱地区最重要的夏季谷物作物。在1997年的生长季节中，从18个地方品种中总共收集了283份种质，并在Benguerdane的IRA进行了体内评估（1998年生长季节）。农民种植的地方品种（种群）被证明是几种类型的混合物。根据IBBPR和ICRISAT（1993）提出的描述词，观察到的所有字符都有相当大的差异。播种后30到66天不等花时间。株高从59到314 cm不等，平均值为197.86±0.43。每株植物的分till数量在0到19之间变化。观察到尖峰形状有相当大的变化。不同尖峰形状的频率分布分析显示，披针形（23.7％）其次是披针形（23.5％）高于圆柱形（18.3％），圆锥形（15.7％），蜡烛（8.7％），纺锤形（6.6％），球棒（3.1 ％）和球状（0.3％）类型。收集的地方品种大多产生大的，灰色的倒卵形种子，部分有角质胚乳。进行方差分析（ANOVA）以评估不同地方品种之间的差异。对于所有研究的字符，差异都非常显着（α= 0.05）。进行了邓肯分析和层次聚类，以（1）估计种源之间的相似度； （2）将地方品种分为同质类（集群）。生成的树状图显示了三个主要簇，它们根据地域来源或耕作条件重新组合。来自突尼斯干旱地区的珍珠粟种质具有广泛的遗传变异性。它可以用作育种计划的起始基础，以选择能够耐受干旱条件的高产品种。

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