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Conny W. Hansen and Jonathan Lynch

Whole-plant biomass accumulation, P dynamics, and root-shoot interactions during transition from vegetative to reproductive growth of `Coral Charm' chrysanthemum (Dendranthema ×grandiflorum Ramat.) (Zander, 1993) were investigated over a range of P concentrations considered to be deficient (1 μm), adequate (100 μm), and high (5 mm). In nondeficient plants, transition from vegetative to reproductive growth resulted in reduced relative growth rate and root and shoot biomass accumulation. Reproductive plants showed a higher commitment of the whole plant to the production of developing flowers than to leaves and roots, whereas, in vegetative plants, the highest component production rate was in leaves. This indicates changes in the source-sink relationships during transition from vegetative growth making developing flowers stronger sinks for photoassimilates than roots. Phosphorus allocated to developing flowers was predominantly lost from leaves. Phosphorus-deficient plants showed characteristic P-deficiency symptoms and favored root growth over shoot growth regardless of growth stage. Phosphorus availability in nondeficient plants affected root growth more than shoot growth. No substantial differences in shoot biomass production, relative growth rate, and CO2 assimilation rates were observed in adequate-P and high-P plants. However, the root component production rate, root to shoot ratio, root length ratio, specific root length, specific root area, root mass to leaf area ratio, and root respiration increased in adequate-P plants compared with high-P plants, which indicates that high root activity was maintained without affecting shoot biomass in buffered P conditions. Our results suggest that the high P concentrations used in many horticultural systems may have no benefit in terms of shoot growth and may actually be detrimental to root growth.

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Rui Wang, Yuqing Gui, Tiejun Zhao, Masahisa Ishii, Masatake Eguchi, Hui Xu, Tianlai Li, and Yasunaga Iwasaki

; Villalobos and Ritchie, 1992 ). Under heat stress, the whole-plant carbohydrate partitioning of rice at anthesis was changed, and the sugars acted as a signal molecule to mediate the source–sink relationship ( Zhang et al., 2018 ). Under suboptimal light

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Yongqiang Qian, Deying Li, Lei Han, and Zhenyuan Sun

defined as a process of redistribution of assimilated resources among the interconnected ramets according to source-sink relationships ( Forde, 1966 ; Kaitaniemi and Honkanen, 1996 ; Marshall, 1990 ). Physiological integration is an important means by

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Horacio E. Alvarado-Raya, Rebecca L. Darnell, and Jeffrey G. Williamson

al., 2006 ) may be the result of an overall decrease in root carbohydrate reserves in the annual system, and not differences in source–sink relationships between the two production systems. Further work on the effects of root pruning on raspberry

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Jieshan Cheng, Peige Fan, Zhenchang Liang, Yanqiu Wang, Ning Niu, Weidong Li, and Shaohua Li

Crop yield and fruit quality in fruit trees are highly dependent on efficient capture of solar energy and subsequent allocation of photoassimilate. Source-sink relationships are important factors influencing these allocation patterns. Fruit

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Marlene Ayala and Gregory Lang

( Tables 4 and 5 ). Conversely, Kappel (1991) reported that, with ‘Lambert’ sweet cherry on vigorous P. avium seedling rootstocks, ES growth had a greater sink strength for photosynthates than fruit. Source–sink relationships and relative C

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Shawna L. Daley, William Patrick Wechter, and Richard L. Hassell

Blake (1994) attribute the loss of total nonstructural carbohydrates to the loss of leaves, the source of carbon and growth hormones in the plants’ source–sink relationship. In a similar way, watermelon rootstock seedlings may be dependent on the

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Ben Hong Wu, Hai Qiang Huang, Pei Ge Fan, Shao Hua Li, and Guo Jie Liu

water reservoir ( Huguet et al., 1992 ). Outflow of water from fruit during the day, as shown by fruit shrinkage, may influence the water status of adjacent leaves. Removing or retaining fruit has often been used in studies of source–sink relationships

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Rebecca L. Darnell, Horacio E. Alvarado-Raya, and Jeffrey G. Williamson

HortTechnology 16 1 6 Fernandez, G.E. Pritts, M.P. 1993 Growth and source-sink relationships in ‘Titan’ red raspberry Acta Hort. 352 151 157 Fernandez, G.E. Pritts, M.P. 1994 Growth

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Lili Zhou, Maria Eloisa Q. Reyes, and Robert E. Paull

have been hampered by the absence of a nondestructive measure of the leaf area and information regarding the impact of leaf area loss on the photosynthesis rate and source-sink relationships. The large size of the leaves in this monopodial plant and the