A comparison of the effects of light intensity and duration on Chrysanthemum morifolium cv. Bright Golden Anne in controlled environments. II. Ontogenetic changes in respiration

Hughes, A.P.

Annals of Botany 37(150): 275-285


ISSN/ISBN: 0305-7364
Accession: 000002578

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In this paper the respiratory behaviour of plants treated in exactly the same way as in part I was examined. The CO2 output of whole plants in the dark was measured towards the end of the light period and again 16 h later. The specific respiration rate fell by about 30% in the 16-h interval and the rate for successive plants also fell linearly with time over the 11 weeks. For most of the experimental period the respiration loss accounted for 0.43-0.50 of the gross photosynthetic gain. The hypothesis that respiration consists of 2 components, one concerned with maintenance and the other with the translocation and incorporation of new material, is examined.