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Quantitative morphological descriptors confirm traditionally classified morphotypes of Tamarindus indica L. fruits

机译：定量形态学描述符证实了罗望子果实传统分类的形态型

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摘要

This study used quantitative descriptors to assess morphological variation of traditionally classified tamarind fruits and its relation to ecological conditions. Tamarind trees were sampled spanning locally recognized fruit morphotypes within three ecological zones. Twelve morphological descriptors were measured on 3000 fruits and seeds. Univariate and canonical discrimiant analyses performed on morphological descriptors revealed significant differences and confirmed morphotypes distinction as perceived by local people. Nevertheless, the variance components analysis showed substantial variations within morphotypes, suggesting a significant heterogeneity within fruits traditionally classified as belonging to the same morphotypes. To get a more powerful morphological discrimination, quantitative descriptors should hence be combined with locally perceived qualitative traits (pulp taste and colour). Observed variations were significantly correlated with ecological factors. Fruits’ and seeds’ size and mass tended to increase with humidity and decline with aridity. Results also indicated that fruit mass is a good predicator of pulp yield, although its predicting power differed among morphotypes. Outputs from the variance component analysis suggested that pending further genetic studies, germplasm collection should be done by sampling a moderate number of trees per morphotype, to ensure capturing a wide range of genetic diversity. The observed extensive variation has provided with relevant information for further improvement programs.
机译：这项研究使用定量描述符来评估传统分类罗望子果实的形态变化及其与生态条件的关系。罗望子树的采样跨越了三个生态区内的当地公认的水果形态。在3000个水果和种子上测量了十二个形态学描述子。对形态描述符进行的单变量和规范判别分析显示了显着差异，并证实了当地人所感知的形态类型差异。然而，方差成分分析显示形态型内存在显着差异，表明在传统上被归类为相同形态型的水果中存在显着的异质性。为了获得更强大的形态学辨别力，因此应将定量描述符与本地感知的定性特征（纸浆口味和颜色）相结合。观测到的变化与生态因素显着相关。水果和种子的大小和质量往往随湿度增加而增加，而随干旱而减少。结果还表明，尽管其形态之间的预测能力有所不同，但果实质量是果肉产量的良好预测指标。方差成分分析的结果表明，在进行进一步的遗传研究之前，应通过对每种形态型取样适量的树木来进行种质收集，以确保捕获广泛的遗传多样性。观察到的广泛变化为进一步改进计划提供了相关信息。

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