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High-Throughput Phenotyping of Indirect Traits for Early-Stage Selection in Sugarcane Breeding

文献类型： 外文期刊

作者： Natarajan, Sijesh 1 ; Basnayake, Jayampathi 1 ; Wei, Xianming 1 ; Lakshmanan, Prakash 2 ;

作者机构： 1.Sugar Res Australia, 30962 Bruce Highway, Brandon, Qld 4808, Australia

2.Guangxi Acad Agr Sci, Sugarcane Res Inst, Nanning 530007, Peoples R China

3.Southwest Univ, Coll Resources & Environm, Interdisciplinary Res Ctr Agr Green Dev Yangtze R, Chongqing 400715, Peoples R China

4.Sugar Res Australia, 50 Meiers Rd, Indooroopilly, Qld 4068, Australia

关键词： inter-plot competition; indirect selection index; UAV; plant breeding; canopy temperature

期刊名称：REMOTE SENSING （ 影响因子：4.848； 五年影响因子：5.353 ）

ISSN：

年卷期： 2019 年 11 卷 24 期

页码：

收录情况： SCI

摘要： One of the major limitations for sugarcane genetic improvement is the low heritability of yield in the early stages of breeding, mainly due to confounding inter-plot competition effects. In this study, we investigate an indirect selection index (S-i), developed based on traits correlated to yield (indirect traits) that were measured using an unmanned aerial vehicle (UAV), to improve clonal assessment in early stages of sugarcane breeding. A single-row early-stage clonal assessment trial, involving 2134 progenies derived from 245 crosses, and a multi-row experiment representative of pure-stand conditions, with an unrelated population of 40 genotypes, were used in this study. Both experiments were screened at several stages using visual, multispectral, and thermal sensors mounted on a UAV for indirect traits, including canopy cover, canopy height, canopy temperature, and normalised difference vegetation index (NDVI). To construct the indirect selection index, phenotypic and genotypic variance-covariances were estimated in the single-row and multi-row experiment, respectively. Clonal selection from the indirect selection index was compared to single-row yield-based selection. Ground observations of stalk number and plant height at six months after planting made from a subset of 75 clones within the single-row experiment were highly correlated to canopy cover (r(g) = 0.72) and canopy height (r(g) = 0.69), respectively. The indirect traits had high heritability and strong genetic correlation with cane yield in both the single-row and multi-row experiments. Only 45% of the clones were common between the indirect selection index and single-row yield based selection, and the expected efficiency of correlated response to selection for pure-stand yield based on indirect traits (44%-73%) was higher than that based on single-row yield (45%). These results highlight the potential of high-throughput phenotyping of indirect traits combined in an indirect selection index for improving early-stage clonal selections in sugarcane breeding.

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