High-throughput phenotyping of lateral expansion and regrowth of spaced Lolium perenne plants using on-field image analysis

Table 3 Correlation (r) between leaf growth (cm °C day⁻¹) based on height at 2 weeks after cutting and regrowth (cm² °C day⁻¹) determined by image analysis (top panel) and between tiller number and base area (cm²) determined by image analysis (bottom panel), at four consecutive cuts (between C2 and C5 of the first growing season)

Genotype groups	Y1C2	Y1C3	Y1C4	Y1C5	Y1 all cuts
Correlation between regrowth and leaf growth
Forage breeding lines	0.543	0.425	0.758	0.769	0.567
Current forage varieties	0.765	0.508	0.685	0.523	0.626
Current turf varieties	0.735	0.682	0.651	0.753	0.770
Wild accessions	0.462	0.316	0.548	0.595	0.529
All groups	0.645	0.608	0.792	0.790	0.686
Correlation between base area and tiller number
Forage breeding lines	0.758	0.682	0.636	0.669	0.824
Current forage varieties	0.847	0.793	0.686	0.824	0.799
Current turf varieties	0.769	0.576	0.461	0.609	0.638
Wild accessions	0.826	0.739	0.726	0.740	0.727
All	0.782	0.731	0.721	0.755	0.769

All correlations were significant (p < 0.05). The highest r values per group are depicted in italics. The highest r values for all groups or for all cuts are underlined

ISSN: 1746-4811