Root Growth Reacts Rapidly and More Pronounced Than Shoot Growth Towards Increasing Light Intensity in Tobacco Seedlings

Walter, Achim; Nagel, Kerstin

doi:10.4161/psb.1.5.3447

Cited by 24 publications

(10 citation statements)

References 17 publications

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“…Sucrose has been long related to the promotion of root growth. [77][78][79] However, the addition of Suc to whole plants in several species has caused no increase in the root to shoot ratio. 61 Thus, Suc might not cause a differential root vs shoot growth promotion.…”

Section: Sucrose Signaling In Plant Developmentmentioning

confidence: 99%

Sucrose signaling in plants: A world yet to be explored

Tognetti

Pontis²,

Martínez-Noël³

2013

Plant Signaling & Behavior

176

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The role of sucrose as a signaling molecule in plants was originally proposed several decades ago. However, recognition of sucrose as a true signal has been largely debated and only recently this role has been fully accepted. The best-studied cases of sucrose signaling involve metabolic processes, such as the induction of fructan or anthocyanin synthesis, but a large volume of scattered information suggests that sucrose signals may control a vast array of developmental processes along the whole life cycle of the plant. Also, wide gaps exist in our current understanding of the intracellular steps that mediate sucrose action. Sucrose concentration in plant tissues tends to be directly related to light intensity, and inversely related to temperature, and accordingly, exogenous sucrose supply often mimics the effect of high light and cold. However, many exceptions to this rule seem to occur due to interactions with other signaling pathways. In conclusion, the sucrose role as a signal molecule in plants is starting to be unveiled and much research is still needed to have a complete map of its significance in plant function.

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Section: Sucrose Signaling In Plant Developmentmentioning

confidence: 99%

Sucrose signaling in plants: A world yet to be explored

Tognetti

Pontis²,

Martínez-Noël³

2013

Plant Signaling & Behavior

176

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“…Under varying environmental conditions, however, the relative growth of the shoot and the root can change. For example, when light is limiting, the RF can change in favor of the shoot [ 1 – 3 ]. Conversely, root fraction increases when the supply of mineral nutrients such as inorganic P i becomes limiting [ 4 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

Mathematical Modeling of the Dynamics of Shoot-Root Interactions and Resource Partitioning in Plant Growth

et al. 2015

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Plants are highly plastic in their potential to adapt to changing environmental conditions. For example, they can selectively promote the relative growth of the root and the shoot in response to limiting supply of mineral nutrients and light, respectively, a phenomenon that is referred to as balanced growth or functional equilibrium. To gain insight into the regulatory network that controls this phenomenon, we took a systems biology approach that combines experimental work with mathematical modeling. We developed a mathematical model representing the activities of the root (nutrient and water uptake) and the shoot (photosynthesis), and their interactions through the exchange of the substrates sugar and phosphate (Pi). The model has been calibrated and validated with two independent experimental data sets obtained with Petunia hybrida. It involves a realistic environment with a day-and-night cycle, which necessitated the introduction of a transitory carbohydrate storage pool and an endogenous clock for coordination of metabolism with the environment. Our main goal was to grasp the dynamic adaptation of shoot:root ratio as a result of changes in light and Pi supply. The results of our study are in agreement with balanced growth hypothesis, suggesting that plants maintain a functional equilibrium between shoot and root activity based on differential growth of these two compartments. Furthermore, our results indicate that resource partitioning can be understood as the emergent property of many local physiological processes in the shoot and the root without explicit partitioning functions. Based on its encouraging predictive power, the model will be further developed as a tool to analyze resource partitioning in shoot and root crops.

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“…A reduction in light intensity leads to a change in plant development and root to shoot ratio ( Fig. 3 , Walter and Nagel, 2006 ; Walter et al , 2007 ). The strong decline of root growth under low light conditions may be triggered by a restricted translocation of leaf assimilates into the below-ground part of plants ( Campbell and Read, 1968 ; Farrar and Jones, 2000 ; Freixes et al , 2002 ).…”

Section: Discussionmentioning

confidence: 99%