tailieunhanh - Báo cáo lâm nghiệp: "Compartmentation of storage compounds in peach leaves"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Compartmentation of storage compounds in peach leaves. | 828s Ann. Sci. For. 1989 46 suppl. 828s-831s Forest Tree Physiology E. Dreyer etal. eds. Elsevier INRA Compartmentation of storage compounds in peach leaves . Gaudillère1 A. Moing1 A. Lamant2 M. Brison2 and J. Schaeffer2 Station de Physiologie Végétale INRA Centre de Bordeaux BP 131 33140 Pont-de-la-Maye and 2Laboratoire de Biologie et de Physiologie Végétale CNRS UA568 Universìté de Bordeaux I 33405 Talence Cedex France Introduction High leaf photosynthesis is achieved when primary photosynthetic products are actively metabolized to avoid inhibition of the carbon reduction cycle. Two main conditions must be fulfilled 1 mineral phosphate must be available Sivak and Walker 1986 and 2 osmotic pressure must be regulated at a physiological level Kaiser et al. 1981 . Many strategies are found amount plants. Carbon can be stored as starch in the chloroplast. Sucrose can be stored in the vacuole and soluble polysaccharides can be synthesized as fructans. Sugar transfer from the mesophyll cells can be very efficient. It can fill storage compartments in the leaf or be loaded into the phloem and exported to other parts of the plant. The study of interactions between photosynthesis and sink activity growth and storage requires detailed information about the movement of carbon among different chemical fractions and among different cell types of the leaf. In this way we examined the distribution of carbon in peach leaves. Materials and Methods Plant material Green or red seedlings of Prunus persica L. Batsch var. GF305 green var. Rubira red were grown in a growth chamber 15 h photoperiod high pressure Na lamps 800 pM m-2-s-1 and 25 20 C day-night temperature . For protoplast preparation expanding leaves about 25 of final area were collected 5 h after the beginning of the light period. The first mature leaves used for sugar analysis were collected at the beginning and at the end of the light period. Biochemical analyses Glucose sucrose sorbitol inositol and a cyanogenic .

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