scholarly journals Response of Pear Trees’ (Pyrus bretschneideri ‘Sinkiangensis’) Fine Roots to a Soil Water Regime of Regulated Deficit Irrigation

Agronomy ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 2316
Author(s):  
Yang Wu ◽  
Zhi Zhao ◽  
Feng Zhao ◽  
Xiaolei Cheng ◽  
Pingping Zhao ◽  
...  
Keyword(s):  
Cell Division ◽  
Water Stress ◽  
Deficit Irrigation ◽  
Fine Root ◽  
Fruit Yield ◽  
Full Irrigation ◽  
Regulated Deficit Irrigation ◽  
Fine Root Length ◽  
Pear Trees ◽  
Stage 1

A field experiment was conducted to evaluate the effects of regulated deficit irrigation (RDI) on the fine root redistribution of mature pear trees in 2009 and 2010. The experiment consisted of four RDI treatments: MRDI-1 and SRDI-1, in which the trees received irrigation replacing 60% and 40% of pan evaporation (Ep) during Stage 1 (cell division stage), and MRDI-1+2 and SRDI-1+2, in which the trees received irrigation replacing 60% and 40% of Ep during Stage 1+2 (cell division and slow shoot growth stage). All the RDI-treated trees received irrigation replacing 80% of Ep (full irrigation) in other stages, and the control trees were fully irrigated during the whole growth season. The results showed that the fine root length density (RLD) of mature pear trees was reduced by water stress. The resumption of full irrigation boosted fine root growth. The RLD of the SRDI-1-treated trees in the irrigated zones recovered in early July, they maintained water and nutrient absorption during the fruit enlargement stage, and the final fruit yield was significantly improved. The RLD of trees in the irrigated zones with MRDI-1 and MRDI-1+2 recovered in July and September, respectively, but there were no significant differences in fruit yield between the MRDI-1, MRDI-1+2, and the control. This indicates that the fruit yield was not negatively or positively impacted by the redistribution of moderate water stress applied during either Stage 1 or Stage 1+2.

scholarly journals Peach Tree Response to Single and Combined Regulated Deficit Irrigation Regimes under Shallow Soils

2003 ◽  
Vol 128 (3) ◽  
pp. 432-440 ◽  
Author(s):  
Joan Girona ◽  
Mercè Mata ◽  
Amadeu Arbonès ◽  
Simó Alegre ◽  
Josep Rufat ◽  
...  
Keyword(s):  
Water Stress ◽  
Deficit Irrigation ◽  
Fruit Size ◽  
Irrigation Scheduling ◽  
Fruit Yield ◽  
Stage Ii ◽  
Regulated Deficit Irrigation ◽  
The Third ◽  
Shallow Soils ◽  
Fruit Load

Productive and vegetative tree responses were analyzed during 3 consecutive years in peach [Prunus persica (L.) Batsch cv. Sudanell] plots subjected to three regulated deficit irrigation (RDI) strategies plus a control irrigation treatment. A postharvest RDI treatment (RDI-P) was irrigated at 0.35 of control after harvest. A Stage II RDI treatment (RDI-SII) was irrigated at 0.5 of control during the lag phase of the fruit growth curve. The third treatment (RDI-SII-P) applied RDI during Stage II at 0.5 of control and postharvest at 0.35 of control. The control treatment, like RDI-P and RDI-SII-P when not receiving RDI, was irrigated at 100% of a water budget irrigation scheduling in 1994 and 1996, full crop years, and 80% of the budget in 1995, an off year with a very small crop. A carry-over effect of deficit irrigation was highly significant in all parameters measured during the third year of the experiment. The general effect of water stress during Stage II did not affect return bloom and fruit set, whereas water stress during postharvest apparently reduced both parameters. As a consequence, fruit counts and fruit load manifested marked differences between treatments, which were also correlated to changes in fruit size. The RDI-II, which had the highest fruit yield, also had the smallest fruit size, whereas RDI-P manifested the lowest yield and largest fruit size. Vegetative growth (shoot elongation and trunk cross sectional area) was significantly reduced during the first 2 years of the experiment in accordance with the amount of the irrigation reduction. However, in 1996 growth was strongly governed by fruit load. The use of RDI-SII-P represented an intermediate cropping effect between the opposite bearing behavior of RDI-SII and RDI-P, while not expecting distinctive fruit yield or size reductions and offering remarkable water savings of 22% of the control applied water.

scholarly journals The effects of drought on the expression of TAO1, NCED and EIL1 genes and ABA content in tomato wild-type and flacca mutant

2012 ◽  
Vol 64 (1) ◽  
pp. 297-306 ◽  
Author(s):  
Ana Milosavljevic ◽  
Ljiljana Prokic ◽  
Milena Marjanovic ◽  
Radmila Stikic ◽  
Aneta Sabovljevic
Keyword(s):  
Deficit Irrigation ◽  
Treatment Duration ◽  
Root Zone ◽  
Full Irrigation ◽  
Aba Signaling ◽  
Wild Type ◽  
Regulated Deficit Irrigation ◽  
Similar Expression Pattern ◽  
Effects Of Drought ◽  
Aba Content

The effects of drought (partial root-zone drying-PRD and regulated deficit irrigation-RDI) and full irrigation (FI) on the expression of ABA biosynthetic genes (TAO1 and NCED), EIL1 gene and ABA content in the leaves of tomato wild-type (WT) and flacca mutant were investigated. Results confirmed differences in the expression of the investigated genes under the investigated treatments, during treatment duration as well as between investigated WT and flacca plants. The most significant differences between WT and flacca were found under PRD treatment. The similar expression pattern of all genes in the WT plants could indicate synergistic signaling pathways for ABA and ethylene. In flacca, reduced NCED and significant EIL1 expression might reflect the increase in ethylene production, which could influence the ABA signaling and production that occurred under PRD. Drought also induced an increase in ABA content that is most expressed in flacca under RDI.

Partial root zone drying exerts different physiological responses on field-grown grapevine (Vitis vinifera cv. Monastrell) in comparison to regulated deficit irrigation

2014 ◽  
Vol 41 (11) ◽  
pp. 1087 ◽  
Author(s):  
Pascual Romero ◽  
Juan Gabriel Pérez-Pérez ◽  
Francisco M. del Amor ◽  
Adrián Martinez-Cutillas ◽  
Ian C. Dodd ◽  
...  
Keyword(s):  
Root Growth ◽  
Water Use ◽  
Deficit Irrigation ◽  
Fruit Set ◽  
Storage Capacity ◽  
Fine Root ◽  
Root Zone ◽  
Biomass Accumulation ◽  
Regulated Deficit Irrigation ◽  
Fine Root Growth

Regulated deficit irrigation (RDI) and partial root zone irrigation (PRI) were compared for 4 years at two irrigation volumes (110 mm year–1 (1) and 78 mm year–1 (2)) in field-grown grafted Monastrell grapevines (Vitis vitifera L.) to distinguish the effects of deficit irrigation from specific PRI effects. PRI-1 and RDI-1 vines received ~30% of the crop evapotranspiration (ETc) from budburst to fruit set, 13–15% from fruit set to veraison and 20% from veraison to harvest. RDI-2 and PRI-2 vines received around 20% of ETc from budburst to fruit set, no irrigation from fruit set to veraison, and recovery (21–24% ETc) thereafter. Compared with RDI-1, PRI-1 increased irrigation depth and total soil water (θv) availability in the root zone, and stimulated greater fine root growth and water uptake. Increased soil volume exploration supported greater canopy water use, vegetative development, biomass accumulation and internal water storage capacity. PRI-1 vines had higher stomatal conductance, lower leaf-level water use efficiency and increased leaf xylem sap concentration ([X-ABA]leaf) following reirrigation. Compared with RDI-2, PRI-2 decreased total θv availability, fine root growth and water uptake, gas exchange, leaf water status, [X-ABA]leaf, biomass accumulation and storage capacity. Xylem ABA decreased with total θv availability in PRI-2, probably from limited sap flow when θv in drying soil was low (≈20%). For this rootstock–scion combination, high irrigation volumes applied to the wet part of the roots (θv > 30%) are critical for increasing root-to-shoot ABA signalling and growth, and improving performance under semiarid conditions.

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