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First insight into diversity of leaf color of loquat (Eribotrya) and its potential value on taxonomy

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Abstract

Leaf morphology is the most intuitive and representative feature that has been applied into field identification and determination of the genetic diversity of loquat germplasms. Using a colorimeter, we analyzed the leaf color traits of 234 loquat accessions in early spring, when four types of leaves (tender leaf on young shoots, mature leaf on autumn shoots, aging leaf on spring shoots and living defoliation) were sampled to measure their front and rear color parameters (L*, a*, b*, C*, H*, E*). Both leaf images and Shannon’s index (I′: 1.76 to 2.00) demonstrate the high diversity of leaf color; Principal Component Analysis shows that a* and b* are mostly significant in cluster analysis. The front and rear color parameters of four types of leaves were respectively clustered, and five dendrograms were selected based on their representative performance on classification. The five-digit search number, which indicates the main cluster of the five dendrograms for each germplasm, and grandient color blocks, which describe the color range of each main cluster, contribute to establishing a taxonomy index. Results demonstrate that loquat leaf color traits not only help to classify the ten species, which fit the Eriobotrya botanical classification and discriminate several landraces and regional resources, but also speed up the classification process and make it intuitive and efficient.

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Acknowledgements

This work has been founded by the National Natural Science Foundation of China (No. 31570679), the Tropical Crop Germplasm Resources Protection Project of Chinese Ministry of Agriculture (15RZZY-15), Species Resources Protection Project of Chinese Ministry of Agriculture (2015NWB008), the Science Technology Department of Zhejiang Province (No. 2016C02052-3), and the Team-building Project of Scientific and Technological Innovation of Fujian Academy of Agricultural Sciences (STIT2017-1-4).

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Correspondence to Shaoquan Zheng or Qiaoping Qin.

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Fig. S1

The unselected dendrograms in this study for loquat classification. Dendrogram of : a) YSr; b) ASf; c) SSf (TIFF 1166 kb)

Table S1

Information of the 234 loquat accessions sampled in this study: country, origin, and germplasm type (DOCX 114 kb)

Table S2

Loquat accessions contained in each main cluster of the five dendrograms (DOCX 117 kb)

Table S3

Key to Eriobotrya based on the leaf color morphology (DOCX 49 kb)

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Shan, Y., Deng, C., Hu, W. et al. First insight into diversity of leaf color of loquat (Eribotrya) and its potential value on taxonomy. Genet Resour Crop Evol 66, 143–163 (2019). https://doi.org/10.1007/s10722-018-0702-x

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