Is coordination of leaf and root growth mediated by abscisic acid? Opinion

Munns, Rana; Cramer, Grant R.

doi:10.1007/bf02257563

Cited by 137 publications

(79 citation statements)

References 99 publications

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“…As discussed above, ABA is generally regarded as an inhibitor of shoot growth (Trewavas & Jones 1991;Davies 1995;Munns & Cramer 1996). Initial studies of the effect of decreasing endogenous ABA levels in maize seedlings grown at low water potential (under conditions of near-zero transpiration) were consistent with this expectation (Saab et al .…”

Section: Aba Accumulation Can Inhibit and Promote Maize Seedling Shoomentioning

confidence: 85%

“…Based on these findings, a commonly proposed function of increased ABA concentrations in water-stressed plants is growth inhibition (reviewed in Trewavas & Jones 1991;Munns & Sharp 1993;Munns & Cramer 1996). Two of the most compelling examples of this type of study are those by Creelman et al .…”

Section: Approaches To Study the Role Of Aba In Growth Responses To Wmentioning

confidence: 99%

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Interaction with ethylene: changing views on the role of abscisic acid in root and shoot growth responses to water stress

Sharp

2002

Plant Cell & Environment

409

248

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Shoot and root growth are differentially sensitive to water stress. Interest in the involvement of hormones in regulating these responses has focused on abscisic acid (ABA) because it accumulates in shoot and root tissues under water-limited conditions, and because it usually inhibits growth when applied to well-watered plants. However, the effects of ABA can differ in stressed and non-stressed plants, and it is therefore advantageous to manipulate endogenous ABA levels under water-stressed conditions. Studies utilizing ABA-deficient mutants and inhibitors of ABA synthesis to decrease endogenous ABA levels, and experimental strategies to circumvent variation in plant water status with ABA deficiency, are changing the view of the role of ABA from the traditional idea that the hormone is generally involved in growth inhibition. In particular, studies of several species indicate that an important role of endogenous ABA is to limit ethylene production, and that as a result of this interaction ABA may often function to maintain rather than inhibit shoot and root growth. Despite early speculation that interaction between these hormones may influence many of the effects of water deficit, this topic has received little attention until recently.

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Section: Aba Accumulation Can Inhibit and Promote Maize Seedling Shoomentioning

confidence: 85%

Section: Approaches To Study the Role Of Aba In Growth Responses To Wmentioning

confidence: 99%

Interaction with ethylene: changing views on the role of abscisic acid in root and shoot growth responses to water stress

Sharp

2002

Plant Cell & Environment

409

248

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“…This raises the question as to whether root and shoot growth are under independent or coordinated genetic controls. Root and shoot growth is indeed closely coordinated (Jackson 1993;Palta et al 2011), and abscisic acid (ABA) likely plays a major role in that regulation (Munns and Cramer 1996). It is, in fact, critical for plants to maintain a hydraulic integrity in the soil-root-xylem-leaf-atmosphere continuum to maintain water fluxes (Kudoyarova et al 2013).…”

Section: Are Root and Shoot Growth Under Common Or Independent Genetimentioning

confidence: 99%

“…Thus, genotypes that exhibit sensitivity to a high VPD with respect to their leaf area development would have smaller leaf areas than insensitive genotypes if grown under such conditions. It is indeed quite clear that leaf development is under hydraulic control (Munns and Cramer 1996;Tardieu et al 2010;Pantin et al 2012). Leaf development is also sensitive to soil drying, and the termination of leaf growth occurs before termination of transpiration (Sadras and Milroy 1996;Soltani et al 2001;Reymond et al 2003;Parent et al 2009;Tardieu et al 2010).…”

Section: Leaf Canopy Developmentmentioning

confidence: 99%

Water: the most important ‘molecular’ component of water stress tolerance research

Vadez

Kholová

Zaman-Allah

et al. 2013

Functional Plant Biol.

104

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Abstract. Water deficit is the main yield-limiting factor across the Asian and African semiarid tropics and a basic consideration when developing crop cultivars for water-limited conditions is to ensure that crop water demand matches season water supply. Conventional breeding has contributed to the development of varieties that are better adapted to water stress, such as early maturing cultivars that match water supply and demand and then escape terminal water stress. However, an optimisation of this match is possible. Also, further progress in breeding varieties that cope with water stress is hampered by the typically large genotype Â environment interactions in most field studies. Therefore, a more comprehensive approach is required to revitalise the development of materials that are adapted to water stress. In the past two decades, transgenic and candidate gene approaches have been proposed for improving crop productivity under water stress, but have had limited real success. The major drawback of these approaches has been their failure to consider realistic water limitations and their link to yield when designing biotechnological experiments. Although the genes are many, the plant traits contributing to crop adaptation to water limitation are few and revolve around the critical need to match water supply and demand. We focus here on the genetic aspects of this, although we acknowledge that crop management options also have a role to play. These traits are related in part to increased, better or more conservative uses of soil water. However, the traits themselves are highly dynamic during crop development: they interact with each other and with the environment. Hence, success in breeding cultivars that are more resilient under water stress requires an understanding of plant traits affecting yield under water deficit as well as an understanding of their mutual and environmental interactions. Given that the phenotypic evaluation of germplasm/breeding material is limited by the number of locations and years of testing, crop simulation modelling then becomes a powerful tool for navigating the complexity of biological systems, for predicting the effects on yield and for determining the probability of success of specific traits or trait combinations across water stress scenarios.

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“…Earlier models favoured a simple redistribution of assimilate in response to altered resource availability but the potential role of signalling has recently been recognized (Stitt & Scheible, 1998). Possible signalling agents include free sugars and amino acids (Buysse et al, 1993), nitrate (Scheible et al, 1997), sucrose (Farrar, 1996), cytokinins (Beck, 1996), sucrose and cytokinins (Van der Werf & Nagel, 1996) and abscisic acid (Munns & Cramer, 1996). The integration of shoot and root activities without intercommunication has also been explored (Cheeseman et al, 1996).…”

Section: mentioning

confidence: 99%

The DL gene system in common bean: a possible mechanism for control of root–shoot partitioning

2000

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Crosses between certain genotypes of common bean result in dwarfing of F1 plants and lethal dwarfing in a proportion of the F2 population. This is under the control of the semi-dominant alleles, DL " and DL # at two complementary loci which are expressed in the root and shoot respectively. The various DL genotypes can be simulated by grafting. The graft combination DL " DL " dl # dl # \dl " dl " DL # DL # was found to have a significantly higher root dry matter fraction than either parent. Lethally dwarfed plants (DL " DL " DL # DL # ) and the analogous lethal graft combination (dl " dl " DL # DL # \DL " DL " dl # dl # ) exhibit failure of root growth and have very low root fractions. Hybrids or graft combinations with failed roots ceased growth and accumulated large amounts of starch throughout their hypocotyls. In sterile culture, both lethal dwarfs and lethal graft combinations were able to grow roots if sucrose was added to the growth medium. This indicates that a failure of sucrose translocation to the roots is probably responsible for failed root growth. Data from screening the DL genotypes of 49 cultivars could be fully explained using the DL system hypothesis, and grafting proved to be efficient for identifying DL genotype. The DL system might be of fundamental importance in root-shoot partitioning. Current evidence favours the hypothesis that failure of root growth is the outcome of excessively high sink strength of shoots compared to roots, which might arise from signalling incompatibilities between the genotypes.

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Is coordination of leaf and root growth mediated by abscisic acid? Opinion

Cited by 137 publications

References 99 publications

Interaction with ethylene: changing views on the role of abscisic acid in root and shoot growth responses to water stress

Interaction with ethylene: changing views on the role of abscisic acid in root and shoot growth responses to water stress

Water: the most important ‘molecular’ component of water stress tolerance research

The DL gene system in common bean: a possible mechanism for control of root–shoot partitioning

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