Abstract
An experimental study was undertaken to assess the extent to which better-situated branches correlatively inhibit other branches on the same plant which are growing in relatively inferior conditions. The experiments were carried out on naturally-grown Onobrychis squarrosa L. (Papilionaceae), a dominant annual plant of the Mediterranean region of Israel. Treatments were carried out (i) on young plants that only had a seminal shoot, and (ii) on plants after lateral branches had started growing. Differential shade conditions were achieved by the repeated removal of neighbours on one side of the plants. The plants were either left intact or damaged by removing different parts of their branch system. In intact plants, growth responses to the differential light conditions which were expressed by the number of branches, leaves and fruits showed some evidence for support of the shaded branches by the exposed branches on the same plant. In contrast, heterogeneous treatments of both shade and branch damaging led to development that reflected marked correlative inhibition of the shaded parts of the plant. The results show that a latent potential for correlative inhibition between branches exists throughout plant development and that in Onobrychis it can be readily realised when plants are damaged. This could depend on known traits of auxin acting as a correlative signal of growing branches. The observed responses of Onobrychis can be understood as an adaptive strategy which reflects the low reliability of environmental signals and the high cost of changing the course of development, especially in short-lived annual plants.
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Abrahamson W. G., Anderson S. S. & McCrea K. D. 1991. Clonal integration: Nutrient sharing between sister ramets of Solidago altissima (Compositae). Amer. J. Bot. 78: 1508–1514.
Birch C. P. D. & Hutchings M. J. 1994. Exploitation of patchily distibuted soil resources by the clonal herb Glechoma hederacea. J. Ecol. 82: 653–664.
Bradshaw A. D. 1965. Evolutionary significance of phenotypic plasticity in plants. Adv. Gen. 13: 115–155.
Chapman D. F., Robson M. J. & Snaydon R. W. 1992. Physiological integration in the clonal perennial herb Trifolium repens L. Oecologia 89: 338–347.
Cline M. G. 1994. The role of hormones in apical dominance. New approaches to an old problem in plant development. Phys. Plant. 90: 230–237.
Crick J. C. & Grime J. P. 1987. Morphological plasticity and mineral nutrient capture in two herbaceous species of contrasted ecology. New Phytol. 107: 403–414.
Drew M. C. 1975. Comparison of the effects of a localised supply of phosphate, nitrate, ammonium and potassium on the growth of the seminal root system, and the shoot, in barley. New Phytol. 75: 479–490.
Drew M. C. & Saker L. R. 1978. Nutrient supply and the growth of the seminal root system in barley. III. Compensatory increases in growth of lateral roots, and in rates of phosphate uptake, in response to a localised supply of phosphate. J. Exp. Bot. 29: 435–451.
Evans J. P. 1991. The effect of resource integration on fitness related traits in a clonal perennial, Hydrocyte bonariensis. Oecologia 86: 268–275.
Evans J. P. & Whitney S. 1992. Clonal integration across a salt gradient by a nonhalophyte, Hydrocotyle bonariensis (Apiaceae). Amer. J. Bot. 79: 1344–1347.
Gersani M. & Sachs T. 1992. Developmental correlations between roots in heterogeneous environments. Plant Cell & Env. 15: 463–469.
Granato T. C. & Raper C. D. J. 1989. Proliferation of maize (Zea mays L.) roots in response to localized supply of nitrate. J. Exp. Bot. 40: 263–275.
Hallé F., Oldeman R. A. A. & Tomlinson P. B. (1978) Tropical trees and forests: an architectural analysis. Springer-Verlag, Berlin.
Hartnett D. C. & Bazzaz F. A. 1983. Physiological integration among interclonal ramets of Solidago canadensis. Ecology 64: 779–788.
Hester M. W., McKee K. L., Burdick D. M., Koch M. S., Flynn K. M., Patterson S. & Mendelssohn I. A. 1994. Clonal integration of Spartina patens across a nitrogen and salinity gradient. Can. J. Bot. 72: 767–770.
Jones M. & Harper J. L. 1987. The influence of neighbours on the growth of trees. II. The fate of buds on long and short shoots in Betula pendula Proc. Roy. Soc. London B. 232: 19–33.
Jónsdótir I. S. & Callaghan T. V. 1990. Interclonal translocation of ammonium and nitrate nitrogen in Carex bigelowii Torr. ex Schwein. using nitrogen-15 and nitrate reductase assays. New Phytol. 114: 419–428.
Novoplansky A. 1991. The response of Portulaca to conflicting light signals. Oecologia 88: 138–140.
Novoplansky A., Cohen D. & Sachs T. 1989. Ecological implication of correlative inhibition in plants. Phys. Plan. 77: 136–140.
Novoplansky A., Cohen D. & Sachs T. 1990. How Portulaca seedlings avoid their neighbours. Oecologia 82: 490–493.
Novoplansky A., Cohen D. & Sachs T. 1994. Responses of an annual plant to temporal changes in light environment: an interplay between plasticity and determination. Oikos 69: 437–446.
Price E. A. C., Marshall C. & Hutchings M. J. 1992. Studies of growth in the clonal herb Glechoma hederacea. I. Patterns of physiological integration. J. Ecol. 80: 25–38.
Rubinstein B & Nagao M. A. 1976. Lateral bud growth and its control by the apex. Bot. Rev. 42: 83–113.
Sachs T. 1981. The controls of the patterned differentiation of vascular tissues. Adv. Bot. Res. 9: 151–262.
Sachs T. 1991. Pattern Formation in Plant Tissues, 234 pp., Cambridge University Press, Cambridge.
Sachs T., Novoplansky A. & Cohen D. 1993. Plants as competing populations of redundant organs. Plant, Cell & Env. 16: 765–770.
Schlichting C. D. 1986. The evolution of phenotypic plasticity in plants. Ann. Rev. Ecol. & Syst. 17: 667–693.
Silvertown J. & Gordon D. M. 1989. A framework for plant behaviour. Ann. Rev. Ecol. & Syst. 20: 349–366.
Slade A. J. & Hutchings M. J. 1987a. Clonal integration and plasticity in foraging behaviour in Glechoma hederacea. J. Ecol. 75: 1023–1036.
Slade A. J. & Hutchings M. J. 1987b. An analysis of the costs and benefits of physiological integration between ramets in the clonal perennial herb Glechoma hederacea, Oecologia 73: 425–431.
Sprugel D. G., Hinckley T. M. & Schaap W. 1991. The theory and practice of branch autonomy. Ann. Rev. Ecol. & Syst. 22: 309–334.
Snow R. 1931. Experiments on growth and inhibition II. New phenomena of inhibition. Proc. Roy. Soc. Lond. B: 108: 305–316.
Sokal R. R. & Rohlf F. J. 1981. Biometry, 2nd edition. W.H. Freeman & Company, San Francisco.
Stuefer J. F., During H. J. & de-Kroon H. 1994. High benefilts of clonal integration in two stoloniferous species, in response to heterogeneous light environments. J. Ecol. 82: 511–518.
Tissue D. T. & Nobel P. S. 1990. Carbon translocation between parents and ramets of a desert perennial. Ann. Bot. 66: 551–558.
Wiersum L. K. 1958. Density of root branching as effected by substrate and separate ions. Acta Bot. Neerl. 7: 174–190.
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Novoplansky, A. Developmental responses of individual Onobrychis plants to spatial heterogeneity. Vegetatio 127, 31–39 (1996). https://doi.org/10.1007/BF00054845
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DOI: https://doi.org/10.1007/BF00054845