Changes in antioxidant activities and phenol content in tomato plants subjected to partial root drying and regulated deficit irrigation

2008 ◽  
Vol 142 (3) ◽  
pp. 550-562 ◽  
Author(s):  
H. Tahi ◽  
S. Wahbi ◽  
C. EL Modafar ◽  
A. Aganchich ◽  
R. Serraj
Keyword(s):  
Deficit Irrigation ◽  
Antioxidant Activities ◽  
Phenol Content ◽  
Regulated Deficit Irrigation ◽  
Tomato Plants ◽  
Partial Root Drying

scholarly journals Irrigation Protocols in Different Water Availability Scenarios for ‘Crimson Seedless’ Table Grapes under Mediterranean Semi-Arid Conditions

Water ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 22
Author(s):  
Abdelmalek Temnani ◽  
María R. Conesa ◽  
Manuel Ruiz ◽  
Juan A. López ◽  
Pablo Berríos ◽  
...  
Keyword(s):  
Deficit Irrigation ◽  
Root Zone ◽  
Maximum Temperature ◽  
Stem Water Potential ◽  
Regulated Deficit Irrigation ◽  
Table Grapes ◽  
Use Efficiency ◽  
Partial Root Drying ◽  
Gaussian Regression ◽  
Sustainable Irrigation

For three consecutive years (2015–2017), two deficit irrigation (DI) strategies were used in a 12-year old vineyard (cv. ‘Crimson Seedless’) to implement a sustainable irrigation protocol according to the available water for the farmer. Four different irrigation treatments were assessed: (i) Control (CTL), irrigated to satisfy the maximum crop water requirements throughout the entire growing season; two DI treatments irrigated as CTL except during post-veraison, when the vines were irrigated at 50% CTL: (ii) Regulated Deficit Irrigation (RDI); and (iii) Partial Root Drying (PRD), alternating the wet and dry sides of the root zone, and (iv) irrigated according to the criteria followed by the farmer (FARM), and conditioned by the availability of water each season. The DI strategies resulted in a 50% increase in water use efficiency in the first two years and 81% during the third year. Weekly deficit irrigation protocols are proposed, which specify a maximum difference of 0.22 MPa of midday stem water potential with respect to well-watered vines for a range of irrigation water availabilities between 4000 and 7000 m3 ha−1. An applied water prediction model based on the Gaussian regression using day of the year and maximum temperature of the day is also proposed.

scholarly journals Physiological mechanism contributing to efficient use of water in field tomato under different irrigation

2009 ◽  
Vol 55 (No. 3) ◽  
pp. 128-133 ◽  
Author(s):  
S. Lei ◽  
Q. Yunzhou ◽  
J. Fengchao ◽  
S. Changhai ◽  
Y. Chao ◽  
...  
Keyword(s):  
Water Stress ◽  
Water Use ◽  
Deficit Irrigation ◽  
Water Status ◽  
Physiological Mechanism ◽  
Regulated Deficit Irrigation ◽  
Normal Water ◽  
Use Efficiency ◽  
Antioxidant Enzymes Activities ◽  
Partial Root Drying

An open field experiment was conducted under furrow irrigation with 3 treatments: CK (control), PRD (partial root drying) and RDI (regulated deficit irrigation). The results showed that water potential, water content of the leaf and growth were decreased under PRD and RDI and the plants met stronger water stress under RDI than under PRD regime. The water use efficiency (WUE) based on fruit yield reached to 10.95 kg/m<SUP>3</SUP> and 15.33 kg/m<SUP>3</SUP>, i.e. 17.1% and 63.9% increase over CK under RDI and PRD, respectively. The transpiration efficiency in RDI was kept at the same level as CK, whereas it was promoted by 32.4% under PRD condition. CAT, SOD and POD activities were more active under RDI and especially under PRD than under CK. Therefore, following conclusions could be made: moderate water stress induced osmotic regulation under PRD conditions, leading to normal water status, higher antioxidant enzymes activities, the same level of biomass and lower water use, thus providing some part of mechanism to higher WUE under PRD condition.

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