Abstract
Greenhouse crops show marked responses to supplementary artificial lighting with Mazda lamps (4). The present study was undertaken to determine whether there are differences in composition between groups of asters subjected to various supplementary light intensities and those which did not receive supplementary light ; and to further ascertain if these differences in chemical composition, especially carbohydrates and nitrogenous compounds, can be correlated with the responses of the aster. This plant was chosen because it blooms in a long day and is suitable for study in short day. Garner and Allard (3) found that many of the plants with which they worked might be classified according to the length of day which favors their reproductive processes, namely: (a) short day type, (b) long day type, and (c) indeterminate type. Murneek (7), and Parker and Borthwick (10) have shown that flower primordia can be initiated in Biloxi soybeans by subjecting the seedlings to a short day of 7 to 8 hours. After this induction period, the plants grown in a short photoperiod fruited while those grown in a long photoperiod remained vegetative. Murneek (7) points out that whether plants are vegetative or reproductive is apparently brought about directly by the length of day. Parker and Borthwick state that changes in chemical composition that can stand in causal relationship to the initiation of flower primordia must occur before initiation can take place. The work of Kraus and Kraybill (6) has shown that the type of response in the tomato plant is associated with the carbohydrate content in relation to the available nitrogen supply. Nightingale (8) found that tomatoes grown under short day conditions and with available nitrogen supply produced vegetative growth. Long days with available nitrogen produced vigorously fruiting plants. In a later study (9) it was shown that Salvia, a short day plant, can be thrown into the vegetative state by lengthening the day. Carbohydrates and nitrates accumulate under short day conditions. When the plants are transferred to long day conditions, there is a loss of carbohydrates, and associated with this loss there is a more
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