Leaf morphology, optical characteristics and phytochemical traits of butterhead lettuce affected by increasing the far-red photon flux.

Front Plant Sci · 2023 · PMC10433762 · PMID 37600174

Europe PMC DOI

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closest p · 0.2× alpha

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highly significantP < 0.01actually significant

The regression coefficients were highly significant ( P < 0.01 or P < 0.001) for all harvest dates, showing a positive effect of far-red fraction on light use efficiency.

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a clear trendno p-value reported

In the NIR region, leaf reflectance did not show a clear trend according to far-red addition.

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an increasing trendno p-value reported

In this study, we found an increasing trend for hexose and sucrose contents with increasing far-red fractions.

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a decreasing trendno p-value reported

The chlorophyll content showed a decreasing trend with increasing far-red fraction, with FR09 (20.6 ± 0.8 μg per cm 2 , far-red fraction 0.04) containing the highest concentration and FR72 (far-red fraction 0.21) the lowest concentration (14.8 ± 0.9 μg per cm 2 ).

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