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Research Article | Open Access

Prediction of Needle Physiological Traits Using UAV Imagery for Breeding Selection of Slash Pine

Xiaoyun Niu1,†, Zhaoying Song1,2,†, Cong Xu3, Haoran Wu1,2, Qifu Luan2, Jingmin Jiang2, Yanjie Li2( )
College of Landscape Architecture and Tourism, Hebei Agriculture University, Baoding 071000, China
Research Institute of Subtropical Forestry, Chinese Academy of Forestry, No. 73, Daqiao Road, Fuyang, Hangzhou 311400, Zhejiang Province, China
New Zealand School of Forestry, University of Canterbury, Private Bag 4800, 8041 Christchurch, New Zealand

†These authors contributed equally to this work

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Abstract

Leaf nitrogen (N) content and nonstructural carbohydrate (NSC) content are 2 important physiological indicators that reflect the growth state of trees. Rapid and accurate measurement of these 2 traits multitemporally enables dynamic monitoring of tree growth and efficient tree breeding selection. Traditional methods to monitor N and NSC are time-consuming, are mostly used on a small scale, and are nonrepeatable. In this paper, the performance of unmanned aerial vehicle multispectral imaging was evaluated over 11 months of 2021 on the estimation of canopy N and NSC contents from 383 slash pine trees. Four machine learning methods were compared to generate the optimal model for N and NSC prediction. In addition, the temporal scale of heritable variation for N and NSC was evaluated. The results show that the gradient boosting machine model yields the best prediction results on N and NSC, with R2 values of 0.60 and 0.65 on the validation set (20%), respectively. The heritability (h2) of all traits in 11 months ranged from 0 to 0.49, with the highest h2 for N and NSC found in July and March (0.26 and 0.49, respectively). Finally, 5 families with high N and NSC breeding values were selected. To the best of our knowledge, this is the first study to predict N and NSC contents in trees using time-series unmanned aerial vehicle multispectral imaging and estimating the genetic variation of N and NSC along a temporal scale, which provides more reliable information about the overall performance of families in a breeding program.

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Plant Phenomics
Volume 5,
2023
Article number: 0028
DOI: 10.34133/plantphenomics.0028
Cite this article:
Niu X, Song Z, Xu C, et al. Prediction of Needle Physiological Traits Using UAV Imagery for Breeding Selection of Slash Pine. Plant Phenomics, 2023, 5: 0028. https://doi.org/10.34133/plantphenomics.0028

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Received: 16 July 2022
Accepted: 06 February 2023
Published: 15 March 2023
© 2023 Xiaoyun Niu et al. Exclusive licensee Nanjing Agricultural University. No claim to original U.S. Government Works.

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