High-resolution spectral information enables phenotyping of leaf epicuticular wax in wheat

Table 7 Correlation of the narrow and broad vegetation indices and the EW content (mg·dm⁻²)

Narrow vegetation indices	Correlation coefficient (r)	Broad vegetation indices	Correlation coefficient (r)
Water index	− 0.18^ns	Violet wavelength	0.64^b
Photochemical reflectance index-1	− 0.57^b	Blue wavelength	0.63^b
Photochemical reflectance index-2	0.41^b	Green wavelength	0.48^b
Red-green index	− 0.08^ns	Yellow wavelength	0.49^b
Normalized difference water index	− 0.45^b	Orange wavelength	0.52^b
Carotenoids reflectance index-1	0.46^b	Red wavelenght	0.33^a
Carotenoids reflectance index-2	− 0.67^b	Red-edge wavelenght	− 0.006^ns
Plant senescence reflectance index	− 0.31^a	Near infrared	0.39^b
Normalized pigment chlorophyll index	− 0.44^b	Normalized difference vegetation index	0.08^ns
Pigment specific simple ratio for chlorophyll-a	− 0.57^b	Simple ratio index	0.11^ns
Pigment specific simple ratio for chlorophyll-b	− 0.55^b	Green normalized difference vegetation index	− 0.34^a
Anthocyanin reflectance index-1	− 0.52^b	Modified simple ratio	0.28^a
Anthocyanin reflectance index-2	− 0.58^b	Renormalized difference vegetation index	0.31^a
Structure insensitive pigment index-1	− 0.34^b	Red-green vegetation index	− 0.57^b
Structure insensitive pigment index-2	− 0.61^b	Ratio vegetation index	− 0.08^ns
		Difference vegetation index	0.37^**
		Simple ratio and normalized difference vegetation index	0.33^a
		Normalized difference vegetation index- Red-edge	0.42^b
		Red_edge chlorophyll index	0.43^b
		Anthocyanin reflectance index-1	− 0.67^b
		Modified Anthocyanins reflectance index	− 0.45^b
		Anthocyanin reflectance index-2	0.32^a

ISSN: 1746-4811