Nondestructive Optical Sensing of Flavonols and Chlorophyll in White Head Cabbage (Brassica oleracea L. var. capitata subvar. alba) Grown under Different Nitrogen Regimens

作者：Agati Giovanni^*; Tuccio Lorenza; Kusznierewicz Barbara; Chmiel Tomasz; Bartoszek Agnieszka; Kowalski Artur; Grzegorzewska Maria; Kosson Ryszard; Kaniszewski Stanislaw

来源：Journal of Agricultural and Food Chemistry, 2016, 64(1): 85-94.

DOI：10.1021/acs.jafc.5b04962

• Brassica oleracea
• chlorophyll fluorescence
• flavonols
• mapping
• nitrogen
• optical sensor
• white head cabbage

A multiparametric optical sensor was used to nondestructively estimate phytochernical compounds in white cabbage leaves directly in the field. An experimental site of 1980 white cabbages (Brassica oleracea L. var. capitata subvar. alba), under different nitrogen (N) treatments, was mapped by measuring leaf transmittance and chlorophyll fluorescence screening in one leaf/cabbage head. The provided indices of flavonols (FLAV) and chlorophyll (CHL) displayed the opposite response to applied N rates, decreasing and increasing, respectively. The combined nitrogen balance index (NBI = CHL/FLAV) calculated was able to discriminate all of the plots under four N regimens (0, 100, 200, and 400 kg/ha) and was correlated with the leaf N content determined destructively. CHL and FLAV were properly calibrated against chlorophyll (R-2 = 0.945) and flavonol (R-2 = 0.932) leaf contents, respectively, by using a homographic fit function. The proposed optical sensing of cabbage crops can be used to estimate the N status of plants and perform precision fertilization to maintain acceptable crop yield levels and, additionally, to rapidly detect health-promoting flavonol antioxidants in Brassica plants.

• 出版日期2016-1-13