Performance of photosynthetic pigments, according to regrowth age after grazing Pennisetum purpureum cv. Cuba CT-115 in the rainy season
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Abstract
Pennisetum purpureum cv. Cuba CT- 115 on the content of green pigments and carotenoids was studied during the rainy season, as well as the relations of the chlorophyll a (Cla) and the age with regrowth yield. The lowest content (P < 0.001) of Cla, chlorophyll b (Clb) and
carotenoids was found at 30 d of regrowth (2.07, 0.71 and 0.49 mg/dm2, respectively). The highest (P < 0.001), for Cla, Clb and carotenoids, was obtained at 105 d (3.04, 1.81 and 0.57 mg/dm2, respectively). The sum of the chlorophylls had the same pattern of response as that of the chlorophylls, but the ratio (Cla/Clb) was higher (P < 0.001) at 30 d. For chlorophylls /carotenoids, the highest value was attained at 105 d of regrowth. An equation of multiple regression was obtained to link the yield of the regrowth with the age and the Cla (R2= 0.91, P < 0.01). It was concluded that in the conditions of this study, the contents of photosynthetic pigments increased with the age and a multiple linear regression was obtained between the age of regrowth, the Cla and the regrowth yield.
Key words: chlorophyll a, chlorophyll b, carotenoids, age, Pennisetum purpureum vc. Cuba CT-115.
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