Genetic and Physiological Controls of Growth under Water Deficit

Tardieu, François; Parent, Boris; Caldeira, Cecílio Fróis; Welcker, Claude

doi:10.1104/pp.113.233353

Cited by 159 publications

(119 citation statements)

References 112 publications

(119 reference statements)

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“…Physiological analyses have shown that plant growth is actively down-regulated during drought and is not limited by carbon supply (1)(2)(3). Reductions of growth help ensure survival by conserving water but can be undesirable for agriculture, as plant productivity is reduced more than need be if growth were less sensitive to changes in water status (3).…”

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confidence: 99%

At14a-Like1 participates in membrane-associated mechanisms promoting growth during drought in Arabidopsis thaliana

Kumar

Hsieh

Verslues

2015

Proc. Natl. Acad. Sci. U.S.A.

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Limited knowledge of how plants regulate their growth and metabolism in response to drought and reduced soil water potential has impeded efforts to improve stress tolerance. Increased expression of the membrane-associated protein At14a-like1 (AFL1) led to increased growth and accumulation of the osmoprotective solute proline without negative effects on unstressed plants. Conversely, inducible RNA-interference suppression of AFL1 decreased growth and proline accumulation during low water potential while having no effect on unstressed plants. AFL1 overexpression lines had reduced expression of many stress-responsive genes, suggesting AFL1 may promote growth in part by suppression of negative regulatory genes. AFL1 interacted with the endomembrane proteins protein disulfide isomerase 5 (PDI5) and NAI2, with the PDI5 interaction being particularly increased by stress. PDI5 and NAI2 are negative regulatory factors, as pdi5, nai2, and pdi5-2nai2-3 mutants had increased growth and proline accumulation at low water potential. AFL1 also interacted with Adaptor protein2-2A (AP2-2A), which is part of a complex that recruits cargo proteins and promotes assembly of clathrin-coated vesicles. AFL1 colocalization with clathrin light chain along the plasma membrane, together with predictions of AFL1 structure, were consistent with a role in vesicle formation or trafficking. Fractionation experiments indicated that AFL1 is a peripheral membrane protein associated with both plasma membrane and endomembranes. These data identify classes of proteins (AFL1, PDI5, and NAI2) not previously known to be involved in drought signaling. AFL1-predicted structure, protein interactions, and localization all indicate its involvement in previously uncharacterized membrane-associated drought sensing or signaling mechanisms.E ven relatively mild drought that causes reduced soil water potential (ψ w ) can result in dramatically reduced plant growth and agricultural productivity. Physiological analyses have shown that plant growth is actively down-regulated during drought and is not limited by carbon supply (1-3). Reductions of growth help ensure survival by conserving water but can be undesirable for agriculture, as plant productivity is reduced more than need be if growth were less sensitive to changes in water status (3). Also, specific metabolic pathways, such as proline metabolism, are stress regulated and contribute to drought tolerance.The sensing and signaling mechanisms controlling growth and metabolic responses to drought remain unclear. Many hypotheses of how plants sense water loss center on detection of mechanical stimuli generated by loss of turgor and cell shrinkage. This includes changes in membrane shape or disruption of cell wall-cell membrane connections possibly detected by proteins, such as mechanosensitive channels or receptor-like kinases that bind cell wall components (4-9). Proteins that induce or detect membrane curvature are known in mammalian cells (10) but have been little considered in plants. Also, in analogy to mammal...

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confidence: 99%

At14a-Like1 participates in membrane-associated mechanisms promoting growth during drought in Arabidopsis thaliana

Kumar

Hsieh

Verslues

2015

Proc. Natl. Acad. Sci. U.S.A.

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“…Breeding for maximal water capture and use for increased transpiration are important targets for yield improvement under unfavorable water conditions (Tambussi et al, 2007;Tardieu et al, 2014). Gas exchange water-use efficiency (WUE), defined as the net CO 2 assimilated by photosynthesis (A) divided by the water transpired in the same time period (T), is related to the genotypic capacity to use available water and, therefore, sustain transpiration under water shortage conditions (Lopes et al, 2011).…”

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Improved Plant Yield Efficiency is Essential for Maize Rainfed Production

et al. 2015

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Plant yield e ciency re ects the single-plant yield at low density that precludes interplant interference for resources. e role of plant yield e ciency in adaptation to water de cit was investigated in maize (Zea mays L.). Also investigated was whether yield of space-planted environments is transferable to densely seeded situations. Further, the correlation and genotype by environment (G × E) interaction of spaced and densely seeded plots were investigated. irty-one lines and 31 crosses among them were tested in three locations under dense stand and the ultra low density of 0.74 plants m -2 as well as in normal and de cit irrigation treatments. e dense stand was 4.44 plants m -2 in the water de cit regime and 6.67 plants m -2 (lines) and 7.84 plants m -2 (hybrids) in the normal water treatment. Hybrids of greater plant yield e ciency were less sensitive to water shortage. Among four hybrids yielding the same at normally irrigated dense stand (11.50 Mg ha -1 ), yield loss due to water shortage was 46% for that of the lowest plant yield e ciency (645 g plant -1 ) and 17% for that of the highest plant yield e ciency (880 g plant -1 ). Correlations between hybrid plant yield e ciency and gas exchange water-use e ciency in dense stand were signi cant. e low density ensured G × E interaction in the quantitative aspect only and thus was of higher heritability, placing emphasis on parental yield per se. Plant yield e ciency is a key element of hybrid ability to withstand water shortage and cope with environmental heterogeneity.Supplemental material available online. I.S. Tokatlidis, C. Tzantarmas, and A. Kargiotidou, Dep. of Agricultural Development, Democritus Univ. of Th race, Orestiada, 68200, Greece; C. Dordas, C. Pankou, F. Gekas, E. Ninou, I. Mylonas, and A. Lithourgidis, School of Agriculture, Aristotle Univ. of Th essaloniki, Th essaloniki, 54124, Greece; F. Papathanasiou, I. Papadopoulos, J.K. Petrevska, and I. Sistanis, Dep. of Agricultural Technology, Technological Educational Institute of Western Macedonia, Florina, 53100, Greece. Received 22 Nov. 2014. Accepted 1 Feb. 2015. *Corresponding author (itokatl@agro.duth.gr; itokatl@hotmail.com).Abbreviations: A, assimilation rate; ASI, anthesis-silking interval; G ´ E, genotype by environment interaction; HI, harvest index; PYE, plant yield effi ciency; T, transpiration; WUE, water-use effi ciency.Ability of a cultivar to tolerate crowding but also perform well at the single-plant level has been asserted to be a determinant element to its crop yield potential (Yan and Wallace, 1995;Fasoula and Tokatlidis, 2012). However, in maize yield more improvement has resulted from improving tolerance to high plant population densities rather than single-plant performance; the per plant yield under minimal competition for light, water, and nutrients remained unchanged (Tollenaar and Lee, 2002;Duvick, 2005). Transition to higher populations in combination with stagnation in yield capacity of individual plants resulted in hybrids characterized as density-dependent (Fas...

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“…A very moderate water deicit, which does not cause lagrant symptoms, results in a signiicant change in the morphology and physiology of the plant in many species [16]. It acts negatively on cell division, enlargement and diferentiation due to loss of turgor and induces decreased energy supply and synthesis of impaired enzymes.…”

Section: Efect On Growth and Water Uptakementioning

confidence: 99%

Alfalfa and Its Symbiosis Responses to Osmotic Stress

Mouradi¹,

Farissi²,

Bouizgaren³

et al. 2018

New Perspectives in Forage Crops

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Alfalfa (Medicago sativa L.) is one of the most cultivated forage legumes in Morocco thanks to its great adaptation to the climatic conditions of this country, its high protein content and its ability to ix atmospheric nitrogen in symbiosis with rhizobia. Environmental stresses such as drought and salinity constitute a major factor limiting the symbiotic nitrogen ixation and legume productivity. In the last decades, this process has interested scholars in understanding the implication of these strains in legume stress tolerance in order to make these symbioses more eicient under diicult conditions. Seed osmopriming is a great technique in the amelioration of seed germination and seedlings growth in responses to several abiotic stress conditions. In this chapter, the efects of water deicit on the Moroccan alfalfa populations and their symbiotic association with rhizobia were discussed. Besides, osmopriming could make these symbioses more eicient especially under stress conditions.

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Genetic and Physiological Controls of Growth under Water Deficit

Cited by 159 publications

References 112 publications

At14a-Like1 participates in membrane-associated mechanisms promoting growth during drought in Arabidopsis thaliana

At14a-Like1 participates in membrane-associated mechanisms promoting growth during drought in Arabidopsis thaliana

Improved Plant Yield Efficiency is Essential for Maize Rainfed Production

Alfalfa and Its Symbiosis Responses to Osmotic Stress

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