Long‐distance abscisic acid signalling under different vertical soil moisture gradients depends on bulk root water potential and average soil water content in the root zone

Puértolas, Jaime; Alcobendas, Rosalía; Alarcón, Juan José; Dodd, Ian C.

doi:10.1111/pce.12076

Cited by 57 publications

(46 citation statements)

References 45 publications

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“…4C) throughout the experiment suggests this is unlikely (although this response may differ in non-peat-based substrates). Alternatively, it seems more likely this is a root-derived response, which may have a number of potential explanations, including decreased synthesis of root ABA (Zhang and Tardieu 1996), decreased flux of ABA from the roots (Jokhan et al 1996) and variation in soil moisture distribution (Puertolas et al 2013) between the different irrigation treatments. Future work should focus on understanding why FDI attenuates the [X-ABA] leaf response.…”

Section: Discussionmentioning

confidence: 99%

Daily irrigation attenuates xylem abscisic acid concentration and increases leaf water potential of Pelargonium × hortorum compared with infrequent irrigation

Boyle

McAinsh

Dodd

2016

Physiologia Plantarum

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The physiological response of plants to different irrigation frequencies may affect plant growth and water use efficiency (WUE; defined as shoot biomass/cumulative irrigation). Glasshouse‐grown, containerized Pelargonium × hortorum BullsEye plants were irrigated either daily at 100% of plant evapotranspiration (ET) (well‐watered; WW), or at 50% ET applied either daily [frequent deficit irrigation (FDI)] or cumulatively every 4 days [infrequent deficit irrigation (IDI)], for 24 days. Both FDI and IDI applied the same irrigation volume. Xylem sap was collected from the leaves, and stomatal conductance (gs) and leaf water potential (Ψleaf) measured every 2 days. As soil moisture decreased, gs decreased similarly under both FDI and IDI throughout the experiment. Ψleaf was maintained under IDI and increased under FDI. Leaf xylem abscisic acid (ABA) concentrations ([X‐ABA]leaf) increased as soil moisture decreased under both IDI and FDI, and was strongly correlated with decreased gs, but [X‐ABA]leaf was attenuated under FDI throughout the experiment (at the same level of soil moisture as IDI plants). These physiological changes corresponded with differences in plant production. Both FDI and IDI decreased growth compared with WW plants, and by the end of the experiment, FDI plants also had a greater shoot fresh weight (18%) than IDI plants. Although both IDI and FDI had higher WUE than WW plants during the first 10 days of the experiment (when biomass did not differ between treatments), the deficit irrigation treatments had lower WUE than WW plants in the latter stages when growth was limited. Thus, ABA‐induced stomatal closure may not always translate to increased WUE (at the whole plant level) if vegetative growth shows a similar sensitivity to soil drying, and growers must adapt their irrigation scheduling according to crop requirements.

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Section: Discussionmentioning

confidence: 99%

Daily irrigation attenuates xylem abscisic acid concentration and increases leaf water potential of Pelargonium × hortorum compared with infrequent irrigation

Boyle

McAinsh

Dodd

2016

Physiologia Plantarum

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“…The PRD irrigation strategy evolved from studies with potted grapevines where it was observed that water use efficiency could be increased without reducing berry size by alternating the wet and dry portions of the root zone to induce root-to-shoot signaling of abscisic acid (ABA) (Stoll, Loveys, & Dry, 2000). A consistent response to PRD can be induced under controlled conditions; however, under field conditions, vine response to PRD has frequently been undistinguishable from that of other deficit irrigation strategies and response has been found to vary according to the supplied percentage of ET c (Dodd, 2009;Davies et al, 2011;Sadras, 2009;Chaves et al, 2010;Puértolas, Alcobendas, Alarcón, & Dodd, 2013;Romero et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Above Ground Drip Application Practices Alter Water Productivity of Malbec Grapevines under Sustained Deficit

Shellie¹

2017

JAS

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An objective of this study was to identify above ground drip application practices for winegrape that increase water productivity and mitigate water deficit-associated loss of yield. The influence of irrigation frequency on water productivity under two severities of sustained deficit irrigation was evaluated in field grown Malbec grapevines (Vitis vinifera L.) over three growing seasons. A weekly amount of water was delivered in a single irrigation event (1X) or apportioned into thirds and delivered in three irrigation events per week (3X). The least severe deficit (STD) had a 3-yr average maximum duty cycle (ratio of irrigation duration to irrigation interval) of 0.3, and vines irrigated 3X relative to 1X had higher water productivity each year due to a decrease in pruning weight. The most severe deficit (STD50) had a 3-yr average maximum duty cycle of 0.02 and vines irrigated 1X relative to 3X had higher water productivity due to a reduction in pruning weight in 2012 and an increase in yield in 2013. The fruit produced from vines irrigated at the frequency with highest water productivity under each deficit severity contained a lower concentration of anthocyanins. While treatment combinations did not alleviate a water-stress associated reduction in yield, results provided new information about grapevine water use efficiency that can be used to select combinations of irrigation frequencies and duty cycles with potential for increasing water productivity.

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“…Compared with the saturated water content in flooded wet samples, the presence of the soil moisture gradient and unfilled pores in the dry samples usually led to a heterogeneous environments with both anaerobic and aerobic micro niches (Puertolas et al 2013), which would support higher microbial diversities (Walsh et al 2005;Crump et al 2012). As a carrier of nutrients, the soil water also regulates the soil nutrients (Bao et al 2015), which were considered to be the best predictors of microbial diversity (Nielsen et al 2010;Wessén et al 2010).…”

Section: Archaeal Diversity Related To Water Floodingmentioning

confidence: 99%

Shifts of archaeal community structure in soil along an elevation gradient in a reservoir water level fluctuation zone

Jiang

et al. 2016

J Soils Sediments

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Purpose Although archaea play an important role in nutrients cycling, the archaeal community in a reservoir water-level fluctuation zone (WLFZ) remains unclear. An elucidation of archaeal community responding to the environmental variables is essential to understand the nutrients dynamics in WLFZ. This study focused on the response of the archaeal community structure and abundance to the periodic water flooding along an elevation gradient in the WLFZ of the Three Gorges Reservoir. Materials and methods Along the elevation gradient (152-175 m) of the study area, soil samples in the beginning and late stages of water flooding were collected to investigate the influence of water flooding on the archaeal community in soil, using quantitative PCR and Illumina high-throughput sequencing approaches.Results and discussion An increase of archaeal abundance from 3.8 × 10 8 to 3.8 × 10 9 copies (g d.w.s) −1 on average was observed after water flooding. The archaeal abundance was positively correlated with the contents of ammonium, organic matter, and moisture in soil and with the accumulated flooding time. Higher diversity was observed in dry samples (non-flooded soil samples) rather than wet samples (flooded soil samples). The Thaumarchaeota were predominant in most of the dry samples. Interestingly, high proportions of Candidatus Nitrososphaera were observed in the transition zone, while euryarchaeotal methanogens dominated the wet samples. The proportion of methanogens decreased dramatically in the dry samples at higher elevations, which was associated with the decrease of the moisture content and the probably increase of available oxygen in soil.Conclusions Archaeal abundance, diversity, and community composition shifted along an elevation gradient and were influenced by water flooding. The increased archaea abundance after water flooding and elevation related community composition and diversity indicated that water flooding was a key dynamic environmental variable in the WLFZ.

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Long‐distance abscisic acid signalling under different vertical soil moisture gradients depends on bulk root water potential and average soil water content in the root zone

Abstract: ABSTRACT

Cited by 57 publications

References 45 publications

Daily irrigation attenuates xylem abscisic acid concentration and increases leaf water potential of Pelargonium × hortorum compared with infrequent irrigation

Daily irrigation attenuates xylem abscisic acid concentration and increases leaf water potential of Pelargonium × hortorum compared with infrequent irrigation

Above Ground Drip Application Practices Alter Water Productivity of Malbec Grapevines under Sustained Deficit

Shifts of archaeal community structure in soil along an elevation gradient in a reservoir water level fluctuation zone

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