Photosynthetic decline and pigment loss during autumn foliar senescence in western larch (Larix occidentalis)

We measured needle pigment content and photosynthetic rates of 1-year-old western larch (Larix occidentalis Nutt.) during autumn foliar senescence. Chlorophyll (Chl) and carotenoid (xanthophyll + beta-carotene) contents of needles declined 11 and 17%, respectively, before CO2 assimilation rate began...

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