Abscisic acid signalling when soil moisture is heterogeneous: decreased photoperiod sap flow from drying roots limits abscisic acid export to the shoots

Dodd, Ian C.; Egea, Gregorio; Davies, W. J.

doi:10.1111/j.1365-3040.2008.01831.x

Cited by 122 publications

(130 citation statements)

References 30 publications

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“…In response to drying soil or a change in salinity, ABA levels in the stem xylem rise rapidly (Jeschke et al, 1997). Movement of ABA from the portion of the root system that senses the change in soil salinity or water availability to the leaves is important in the coordination of the plant response (Dodd et al, 2008(Dodd et al, , 2010Puértolas et al, 2015). In response, patterns of root growth are altered, with some root tips inhibited and others stimulated, and stomata in the leaf close (Daszkowska-Golec and Szarejko, 2013;Harris, 2015).…”

Section: Introductionmentioning

confidence: 99%

Environmental Nitrate Stimulates Abscisic Acid Accumulation in Arabidopsis Root Tips by Releasing It from Inactive Stores

2016

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Abscisic acid (ABA) signaling plays a major role in root system development, regulating growth and root architecture. However, the precise localization of ABA remains undetermined. Here, we present a mechanism in which nitrate signaling stimulates the release of bioactive ABA from the inactive storage form, ABA-glucose ester (ABA-GE). We found that ABA accumulated in the endodermis and quiescent center of Arabidopsis thaliana root tips, mimicking the pattern of SCARECROW expression, and (to lower levels) in the vascular cylinder. Nitrate treatment increased ABA levels in root tips; this stimulation requires the activity of the endoplasmic reticulum-localized, ABA-GE-deconjugating enzyme b-GLUCOSIDASE1, but not de novo ABA biosynthesis. Immunogold labeling demonstrated that ABA is associated with cytoplasmic structures near, but not within, the endoplasmic reticulum. These findings demonstrate a mechanism for nitrate-regulated root growth via regulation of ABA accumulation in the root tip, providing insight into the environmental regulation of root growth.

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Section: Introductionmentioning

confidence: 99%

Environmental Nitrate Stimulates Abscisic Acid Accumulation in Arabidopsis Root Tips by Releasing It from Inactive Stores

2016

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“…Therefore, it was observed that the ABA concentration under PRD was higher than RDI in most measurements taken in our study. Accumulated evidence has indicated that, given the same irrigation volume, PRD frequently results in higher ABA concentration in the xylem than RDI, which has been considered to contribute to better stomatal control over plant water use [43,44] .…”

Section: Resultsmentioning

confidence: 99%

Assessing effects of deficit irrigation techniques on water productivity of tomato for subsurface drip irrigation system

Hashem¹,

El-Abedin²,

Al-Ghobari³

2018

International Journal of Agricultural and Biological Engineering

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Water resources are subjected to ever-increasing supply constraints due to extensive agricultural water demand for irrigated lands. Therefore, water-saving irrigation strategies need to be explored. The present study was conducted to explore the possibilities of using regulated deficit irrigation (RDI) and partial root zone drying irrigation (PRD) methods as water-saving irrigation techniques for subsurface irrigation. The objective of this study are to assess the effects of RDI and PRD irrigation on the water productivity of vegetable crops (tomato) under SSD systems in arid climatic conditions, and to compare the responses of tomato crops to PRD, RDI, and FI under an SSD system in terms of productivity, crop quality, and the amount of water saved. The field experiment was conducted during the fall 2014-2015 and 2015-2016 Citation: Hashem M S, El-Abedin T Z, Al-Ghobari H M. Assessing effects of deficit irrigation techniques on water productivity of tomato for subsurface drip irrigation system. Int J Agric & Biol Eng, 2018; 11(4): 156-167.

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“…Detailed work by Dodd and colleagues (Dodd et al 2006(Dodd et al , 2008a(Dodd et al , 2008bDodd 2007) has shown how PRD can enhance hormone signalling between roots and shoots and that such signalling can have beneficial effects on the efficiency of water use. However, enhanced signalling does not always occur and this is particularly the case at lower soil water contents, an observation that can explain some of the negligible effects of PRD reported by Sadras.…”

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confidence: 99%

Drought effects and water use efficiency: improving crop production in dry environments

Chaves¹,

Davies²

2010

Functional Plant Biol.

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Abstract. There is global concern over our capacity to feed a rapidly growing world population against a background of climate change and a shortage of renewable resources for agriculture. To address this challenge, sustainable intensification of crop production will be required to deliver increased yields with decreased environmental side effects, while maintaining the land area under cultivation. We must exploit new understanding in the science of crop production, in order to achieve both an improvement of crops and more effective agro-ecological management. The focus of this short article and the following papers that make up a research front on drought effects and water use efficiency is on science for the development of crops and cropping systems for water scarce environments. Both increases in drought resistance and efficiency of water use will be required in the major cropping regions of the world where water is already a significant limiting factor.

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Abscisic acid signalling when soil moisture is heterogeneous: decreased photoperiod sap flow from drying roots limits abscisic acid export to the shoots

Abstract: ABSTRACT

Cited by 122 publications

References 30 publications

Environmental Nitrate Stimulates Abscisic Acid Accumulation in Arabidopsis Root Tips by Releasing It from Inactive Stores

Environmental Nitrate Stimulates Abscisic Acid Accumulation in Arabidopsis Root Tips by Releasing It from Inactive Stores

Assessing effects of deficit irrigation techniques on water productivity of tomato for subsurface drip irrigation system

Drought effects and water use efficiency: improving crop production in dry environments

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